336
336
May 29, 2011
05/11
by
Dang, Qinglai; Margolis, Hank; Coyea, Mari
texts
eye 336
favorite 0
comment 0
The Boreal Ecosystem-Atmospheric Study (BOREAS) TE-9 (Terrestrial Ecology) team collected several data sets related to chemical and photosynthetic properties of leaves in boreal forest tree species. This data set describes the relationship between photosynthetically active radiation (PAR) levels and foliage nitrogen in samples from six sites in the BOREAS Northern Study Area (NSA) collected during the three 1994 intensive field campaigns (IFCs). This information is useful for modeling the...
Topics: IO, TORUSES, SATELLITE ATMOSPHERES, SPACE OBSERVATIONS (FROM EARTH), PLANETARY MAGNETOSPHERES
291
291
May 29, 2011
05/11
by
Gatlin, G. M.; Parker, P. A.; Owens, L. R., Jr
texts
eye 291
favorite 0
comment 0
A need for low-speed, high Reynolds number test capabilities has been identified for the design and development of advanced subsonic transport high-lift systems. In support of this need, multiple investigations have been conducted in the National Transonic Facility (NTF) at the NASA Langley Research Center to develop a semi-span testing capability that will provide the low-speed, flight Reynolds number data currently unattainable using conventional sting-mounted, full-span models. Although a...
Topics: IO, TORUSES, SATELLITE ATMOSPHERES, SPACE OBSERVATIONS (FROM EARTH), PLANETARY MAGNETOSPHERES
The objective of the proposal was to construct global magnetospheric models of Jupiter for the use of Jovian magnetospheric community. In the four years of the grant period we were able to achieve all of the stated science objectives. The work has resulted in: 1) A new structural model of Jovian current sheet; 2) Global thickness map of the current sheet; 3) Magnetic field models of the current sheet; 4) The global model of Jupiter's magnetospheric field including hinging and delay of the...
Topics: NASA Technical Reports Server (NTRS), JUPITER ATMOSPHERE, PLANETARY MAGNETOSPHERES, ATMOSPHERIC...
419
419
Jul 11, 2010
07/10
by
Weinstein, M. S
texts
eye 419
favorite 0
comment 0
Two master resolution friskets were produced on Kodak film types SO-368 and SO-242. These target masters consisted of 21 density steps with three-bar resolution targets at five modulation levels within each step. The target masters were contact printed onto Kodak separation negative film, type 4131, using both a contact printing frame and enlarger as one method of exposure, and a Miller-Holzwarth contact printer as the other exposing device. Red, green, and blue Wratten filters were used to...
Topics: DIFFUSION THEORY, ELECTRON DIFFUSION, JUPITER (PLANET), RADIATION BELTS, DIFFUSION COEFFICIENT,...
289
289
Jul 25, 2010
07/10
by
Beltracchi, Todd J.; Gabriele, Gary A
texts
eye 289
favorite 0
comment 0
The method proposed for estimating sensitivity derivatives is based on the Recursive Quadratic Programming (RQP) method and in conjunction a differencing formula to produce estimates of the sensitivities. This method is compared to existing methods and is shown to be very competitive in terms of the number of function evaluations required. In terms of accuracy, the method is shown to be equivalent to a modified version of the Kuhn-Tucker method, where the Hessian of the Lagrangian is estimated...
Topics: MAGNETOHYDRODYNAMIC STABILITY, PLANETARY MAGNETOSPHERES, PLASMA WAVES, WAVE PROPAGATION, BOUNDARY...
This document is the final report for NASA Grant NAG5-4615, 'Satellie Atmosphere and Io Torus Observations', Nicholas M. Schneider, P.I., awarded to the University of Colorado, 8/l/97-3/31/00. The grant was originally awarded to Dr. Doyle T. Hall, who left the University of Colorado before the completion of the project. Io is the most volcanically active body in the solar system, and it is embedded deep within the strongest magnetosphere of any planet. This combination of circumstances leads to...
Topics: NASA Technical Reports Server (NTRS), IO, TORUSES, SATELLITE ATMOSPHERES, SPACE OBSERVATIONS (FROM...
396
396
May 30, 2011
05/11
by
Patterson-Hine, Ann; Hindson, William; Sanderfer, Dwight; Deb, Somnath; Domagala, Chuc
texts
eye 396
favorite 0
comment 0
Model-based reasoning techniques hold much promise in providing comprehensive monitoring and diagnostics capabilities for complex systems. We are exploring the use of one of these techniques, which utilizes multi-signal modeling and the TEAMS-RT real-time diagnostic engine, on the UH-60 Rotorcraft Aircrew Systems Concepts Airborne Laboratory (RASCAL) flight research aircraft. We focus on the engine and transmission systems, and acquire sensor data across the 1553 bus as well as by direct...
Topics: MERCURY (PLANET), RADIO WAVES, SPACE MISSIONS, PLASMA WAVES, SPECTRAL RESOLUTION, TEMPORAL...
The Magnetospheric Multiscale (MMS) mission is a formation flying mission that consists of four distinct phases: phases 1 and 2 are low-inclination highly elliptical orbits (HEO), phase 3 is a double-lunar swingby which transfers phase 2 to phase 4, a high-inclination HE0 orbit. Phase 2 is designed to reach the first lunar swingby of phase 3 in the most efficient fashion. It is shown that when the orientation of the line of apsides of phase 2 is properly chosen, no extra Delta-V is required...
Topics: NASA Technical Reports Server (NTRS), LUNAR PHASES, PLANETARY MAGNETOSPHERES, ABORT TRAJECTORIES,...
Io is the most volcanically active body in the solar system, and it is embedded deep within the strongest magnetosphere of any planet. This combination of circumstances leads to a host of scientifically compelling phenomena, including (1) an atmosphere out of proportion with such a small object, (2) a correspondingly large atmospheric escape rate, (3) a ring of dense plasma locked in a feedback loop with the atmosphere, and (4) a host of Io-induced emissions from radio bursts to UV auroral...
Topics: NASA Technical Reports Server (NTRS), IO, TORUSES, SATELLITE ATMOSPHERES, SPACE OBSERVATIONS (FROM...
206
206
May 31, 2011
05/11
by
Woods, Judy L.; West, Jeff S.; Sulyma, Peter R
texts
eye 206
favorite 0
comment 0
Lockheed Martin Space Operations - Stennis Programs (LMSO) at the John C Stennis Space Center (NASA/SSC) has designed and built a Beowulf computer cluster which is owned by NASA/SSC and operated by LMSO. The design and construction of the cluster are detailed in this paper. The cluster is currently used for Computational Fluid Dynamics (CFD) simulations. The CFD codes in use and their applications are discussed. Examples of some of the work are also presented. Performance benchmark studies have...
Topics: IO, PLANETARY MAGNETIC FIELDS, TORUSES, PLANETARY MAGNETOSPHERES, JUPITER (PLANET), FIELD ALIGNED...
437
437
Jun 11, 2011
06/11
by
Dufrene, Warren R., Jr
texts
eye 437
favorite 0
comment 0
This paper describes the development of a planned approach for Autonomous operation of an Unmanned Aerial Vehicle (UAV). A Hybrid approach will seek to provide Knowledge Generation through the application of Artificial Intelligence (AI) and Intelligent Agents (IA) for UAV control. The applications of several different types of AI techniques for flight are explored during this research effort. The research concentration is directed to the application of different AI methods within the UAV arena....
Topics: PLASMA WAVES, POLAR CAPS, WAVE-PARTICLE INTERACTIONS, DATA PROCESSING, WINDPOWER UTILIZATION,...
The planned Voyager 2 Saturn mission is described. Information about Saturn obtained from the Voyager 1 encounter is summarized. Data on the satellites and rings of Saturn are tabulated. The video programming schedule for the Voyager 2 Saturn encounter is given. The Voyager science team is listed.
Topics: NASA Technical Reports Server (NTRS), MISSION PLANNING, SATURN (PLANET), VOYAGER PROJECT, PLANETARY...
The convective motion and its relation to the electric field in the magnetosphere of Jupiter are investigated. It is shown that the electric field is induced in the Jovian ionosphere due to the corotating action of the ionospheric gases and further is communicated into the magnetosphere along the magnetic lines of force which connect between the ionosphere and the magnetosphere. This electric field drives the plasma to corotate with the planet in the magnetosphere. The distribution of the...
Topics: NASA Technical Reports Server (NTRS), CONVECTION CURRENTS, ELECTRIC FIELDS, JUPITER (PLANET),...
Topics: NASA Technical Reports Server (NTRS), ASTRONOMICAL PHOTOGRAPHY, SATURN (PLANET), VOYAGER 1...
The M2P2 concept is based on the transfer of momentum from the solar wind to an artificial magnetic field structure like that naturally occurs at all magnetized planets in the Solar System, called the magnetosphere. The objectives of this program include the following: (1) Demonstrate artificial magnetospheric inflation through cold plasma filling in vacuum; (2) Demonstrate deflection of a surrogate solar wind by an artificial magnetosphere in the laboratory vacuum chamber; (3) Compare...
Topics: NASA Technical Reports Server (NTRS), MAGNETIC FIELD CONFIGURATIONS, PLASMA PROPULSION, SPACE...
Progress in research to understand the three-dimensional nature of the Europagenic plasma torus is summarized. Efforts to improve the plasma torus description near Europa's orbit have included a better understanding of Europa's orbit and an improved description of the planetary magnetic field. New plasma torus chemistry for molecular and atomic species has been introduced and implemented in Europa neutral cloud models. Preliminary three-dimensional model calculations for Europa's neutral clouds...
Topics: NASA Technical Reports Server (NTRS), JUPITER (PLANET), PLANETARY MAGNETOSPHERES, EUROPA, SPACE...
432
432
May 23, 2011
05/11
by
McKinnon, William B.; Schenk, Paul M
texts
eye 432
favorite 0
comment 0
Chains of impact craters, or catenae, have been identified in Voyager images of Callisto and Ganymede. Although these resemble in some respects secondary crater chains, the source craters and basins for the catenae cannot be identified. The best explanation is a phenomenon similar to that displayed by former comet Shoemaker-Levy 9; tidal (or other) breakup close to Jupiter followed by gradual orbital separation of the fragments and collision with a Galilean satellite on the outbound leg of the...
Topics: AURORAS, AURORAL TEMPERATURE, FIELD ALIGNED CURRENTS, JUPITER ATMOSPHERE, ULTRAVIOLET IMAGERY,...
Under this grant we have undertaken a series of magnetohydrodynamic (MHD) simulation and data analysis studies to help better understand the configuration and dynamics of Jupiter's magnetosphere. We approached our studies of Jupiter's magnetosphere in two ways. First we carried out a number of studies using our existing MHD code. We carried out simulation studies of Jupiter s magnetospheric boundaries and their dependence on solar wind parameters, we studied the current systems which give the...
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY MAGNETIC FIELDS, JUPITER (PLANET),...
367
367
May 29, 2011
05/11
by
Anderson, Darwin; Papagno, Andre
texts
eye 367
favorite 0
comment 0
The BOREAS TE-1 team collected various data to characterize the soil-plant systems in the BOREAS SSA. Particular emphasis was placed on nutrient biochemistry, the stores and transfers of organic carbon, and how the characteristics were related to measured methane fluxes. The overall transect in the Prince Albert National Park (Saskatchewan, Canada) included the major plant communities and related soils that occurred in that section of the boreal forest. Soil physical, chemical, and biological...
Topics: PLANETARY MAGNETOSPHERES, RUNGE-KUTTA METHOD, SATELLITE ORBITS, ENERGETIC PARTICLES, GALILEAN...
A theoretical model is presented for the plasma in the Jovian magnetosphere whose pressure is comparable to the corotational energy density. The model predicts a thin current sheet of 1 Jupiter radius to 2 Jupiter radii half-thickness. The current sheet lies almost precisely in the magnetic equatorial plane and is not appreciably warped as suggested previously.
Topics: NASA Technical Reports Server (NTRS), ASTRONOMICAL MODELS, CURRENT SHEETS, JUPITER ATMOSPHERE,...
Information about the magnetosphere of Saturn is provided: the magnetic dipole moment is axisymmetric, the bow shock stand-off distance is about 22 R sub S. The satellites Titan, Dione, and Tethys are probably the primary sources of magnetospheric plasma. Outside of approx. 4 R sub S, energetic particles are energized by diffusing inward while conserving their first and second adiabatic invariants. Particles are lost by satellite sweep-out, absorption byt the E ring and probably also by plasma...
Topics: NASA Technical Reports Server (NTRS), BOW WAVES, PLANETARY MAGNETOSPHERES, SATURN (PLANET), DIONE,...
The purpose of this investigation was to establish the relative roles of solar wind and the internal plasma processes in shaping the structure and dynamics of Jupiter's magnetosphere. We carried out several investigations to establish these roles. Three new research papers have resulted from this work. In the following we provide brief summaries of the main findings.
Topics: NASA Technical Reports Server (NTRS), JUPITER (PLANET), GEOPHYSICS, PLANETARY MAGNETOSPHERES, SOLAR...
Flux profiles which were derived from data returned by Pioneer 10 during Jupiter encounter, form the basis for a new set of numerical models for the energy spectra of electrons and protons in Jupiter's inner magnetosphere.
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC MODELS, JUPITER (PLANET), RADIATION BELTS, ENERGY...
In 1979-1981, the three USA spacecraft Pioneer 11 and Voyagers 1 and 2 discovered and explored the magnetosphere of Saturn to the limited extent possible on flyby trajectories. Considerable variation in the locations of the bow shock (BS) and magnetopause (MP) surfaces were observed in association with variable solar wind conditions and, during the Voyager 2 encounter, possible immersion in Jupiter's distant magnetic tail. The limited number of BS and MP crossings were concentrated near the...
Topics: NASA Technical Reports Server (NTRS), BOUNDARIES, PLANETARY MAGNETOSPHERES, SATURN (PLANET), BOW...
418
418
Jul 26, 2010
07/10
by
Bakhle, Milind A.; Mahajan, Aparajit J.; Keith, Theo G., Jr.; Stefko, George L
texts
eye 418
favorite 0
comment 0
Two methods for calculating linear frequency domain aerodynamic coefficients from a time marching Full Potential cascade solver are developed and verified. In the first method, the Influence Coefficient, solutions to elemental problems are superposed to obtain the solutions for a cascade in which all blades are vibrating with a constant interblade phase angle. The elemental problem consists of a single blade in the cascade oscillating while the other blades remain stationary. In the second...
Topics: MERCURY SPACECRAFT, MERCURY (PLANET), MERCURY PROJECT, PLANETARY ORBITS, SPACE EXPLORATION,...
The research performed in this project is divided in two main investigations: (1) the synthesis and analysis of a collection of independent observations for Io's sodium corona, its sodium extended atmosphere, and the sodium cloud, and (2) the analysis of a (System III longitude correlated) space-time 'bite-out' near western elongation in the 1981 sodium cloud images from the JPL Table Mountain Sodium Cloud Data Set. For the first investigation, modeling analysis of the collective observed...
Topics: NASA Technical Reports Server (NTRS), CORONAS, IO, JUPITER ATMOSPHERE, PLANETARY MAGNETOSPHERES,...
The trapping of Titan's escaping atmosphere in the Saturnian system by a toroidal ring is discussed. The radius of the toroid is comparable to Titan's orbit, or about ten times larger than the visible rings. Theoretical atmospheric models are formulated that consider Saturn's gravitational attraction and magnetospheric properties in forming this toroid and in protecting toroid particles from direct ionization by solar wind particles.
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC MODELS, HYDROGEN ATOMS, SATURN RINGS, TITAN,...
A model magnetosphere of Mercury using Mariner 10 data is presented. Diagrams of the bow shock wave and magnetopause are shown. The analysis of Mariner 10 data indicates that the magnetic field of the planet is intrinsic. The magnetic tail and secondary magnetic fields, and the influence of the solar wind are also discussed.
Topics: NASA Technical Reports Server (NTRS), GEOMAGNETISM, MERCURY (PLANET), PLANETARY MAGNETOSPHERES,...
"Theory and simulations of solar system plasmas" aims to highlight results from microscopic to global scales, achieved by theoretical investigations and numerical simulations of the plasma dynamics in the solar system. The theoretical approach must allow evidencing the universality of the phenomena being considered, whatever the region is where their role is studied; at the Sun, in the solar corona, in the interplanetary space or in planetary magnetospheres. All possible theoretical...
Topics: NASA Technical Reports Server (NTRS), PLASMA DYNAMICS, PLANETARY MAGNETOSPHERES, INTERPLANETARY...
Models of the Saturnian magnetosphere based on the application of magnetospheric scaling relations to a spin-aligned planetary magnetic dipole, that produces a surface equatorial field strength in the range 0.5 to 2 gauss, exhibit the following properties: (1) The orbit of Titan lies inside of the magnetosphere essentially all of the time, even when variations in the size of the magnetosphere resulting from solar wind pressure changes are taken into account; (2) the Brice-type planetary...
Topics: NASA Technical Reports Server (NTRS), PHYSICAL PROPERTIES, PLANETARY MAGNETOSPHERES, SATURN...
An attempt is made to establish safety limits for space missions near Jovian radio belts. A proton belt model was constructed and analyzed in an effort to set these limits based on the possible stability of radiation belts. Calculation results are graphed.
Topics: NASA Technical Reports Server (NTRS), CONFIDENCE LIMITS, JUPITER (PLANET), RADIATION BELTS,...
The primary thrust of the effort at The University of Iowa for the definition of an orbiter mission to Mercury is a minimum viable radio and plasma wave investigation. While it is simple to add sensors and capability to any payload, the challenge is to do reasonable science within limited resources; and viable missions to Mercury are especially limited in payload mass. For a wave investigation, this is a serious concern, as the sensor mass often makes up a significant fraction of the...
Topics: NASA Technical Reports Server (NTRS), MERCURY (PLANET), RADIO WAVES, SPACE MISSIONS, PLASMA WAVES,...
A model magnetosphere for Mercury is presented using an upstream image-dipole and nightside 2-dimensional tail current sheet method. The tail field is represented by an analytical formulation. Magnetic field data from the Mercury 1 encounter by Mariner 10 in March 1974 are used to determine quantitative parameters of the model magnetosphere, using the method of least squares. The magnetopause crossing points directly observed are used to determine the size of the magnetosphere, and the solar...
Topics: NASA Technical Reports Server (NTRS), MATHEMATICAL MODELS, MERCURY (PLANET), PLANETARY...
243
243
May 23, 2011
05/11
by
Lin, Shu; Uehara, Gregory T
texts
eye 243
favorite 0
comment 0
In his research, we have proposed the (64, 40, 8) subcode of the third-order Reed-Muller (RM) code to NASA for high-speed satellite communications. This RM subcode can be used either alone or as an inner code of a concatenated coding system with the NASA standard (255, 233, 33) Reed-Solomon (RS) code as the outer code to achieve high performance (or low bit-error rate) with reduced decoding complexity. It can also be used as a component code in a multilevel bandwidth efficient coded modulation...
Topics: ANGULAR DISTRIBUTION, LOSSES, NEUTRON DECAY, PIONEER 11 SPACE PROBE, ELECTRONS, ENERGY SPECTRA,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), GANYMEDE, PLANETARY MAGNETOSPHERES, AURORAS, PLANETARY...
296
296
Jun 13, 2011
06/11
by
Phillips, Thomas A.; Macleod, Todd C.; Ho, Fat D
texts
eye 296
favorite 0
comment 0
Previous research investigated the modeling of a N Wga te constructed of Metal-Ferroelectric- Semiconductor Field-Effect Transistors (MFSFETs) to obtain voltage transfer curves. The NAND gate was modeled using n-channel MFSFETs with positive polarization for the standard CMOS n-channel transistors and n-channel MFSFETs with negative polarization for the standard CMOS p-channel transistors. This paper investigates the MFSFET NAND gate switching time propagation delay, which is one of the other...
Topics: MESSENGER (SPACECRAFT), PLASMA INTERACTIONS, FIELD ALIGNED CURRENTS, WAVE PROPAGATION, SPACE...
We investigate the transport of ions in the low-altitude magnetosphere magnetosphere of Mercury. We show that, because of small spatial scales, the centrifugal effect due to curvature of the E B drift paths can lead to significant particle energization in the parallel direction. We demonstrate that because of this effect, ions with initial speed smaller than the escape speed such as those produced via thermal desorption can overcome gravity and escape into the magnetosphere. The escape route of...
Topics: NASA Technical Reports Server (NTRS), CENTRIFUGAL FORCE, MERCURY (PLANET), PLANETARY...
It is shown that the plasma in Jupiter's ionosphere is collisionless above a certain level. In the outer magnetosphere, where the rotational force dominates the gravitational force, the collisionless plasma has a beam-like distribution and gives rise to a two-stream instability. This leads to trapping of plasma in the centrifugally dominated region of the magnetosphere. Plasma is lost by recombination. Equilibrium-trapped particle densities are calculated by requiring a balance between trapping...
Topics: NASA Technical Reports Server (NTRS), JUPITER (PLANET), MAGNETOSPHERIC ION DENSITY, PLANETARY...
The time histories, angular distributions and energy spectra of energetic protons were measured over an energy range extending from 0.2 - 20 MeV for the four passes of Pioneers 10 and 11 through the Jovian magnetosphere. Azimuthal asymmetries appear to dominate with time variations also contributing to the very complex topology. On the inbound P-10 pass the expected corotation anisotropy was not observed in the outer magnetosphere supporting the probable existence of a planetary wind in this...
Topics: NASA Technical Reports Server (NTRS), JUPITER ATMOSPHERE, PLANETARY MAGNETOSPHERES, PROTONS,...
This serves as a final report entitled Energization and Transport of Ions of Ionospheric Origin in the Terrestrial Magnetosphere. The work has been predominantly focused on ion outflows identified in two data sets: (1) Prognoz 7; and (2) Dynamics Explorer. The study analyzed ion densities, temperatures, and flow velocities in the magnetotail. The work performed under this contract consisted of developing a program to load the raw data, compute the background subtraction of a strong sun pulse,...
Topics: NASA Technical Reports Server (NTRS), FLOW VELOCITY, ION EMISSION, IONOSPHERIC COMPOSITION,...
The engine that drives the jovian magnetosphere is the mass added to the Io ion torus, accelerated to corotational velocities by field-aligned currents that couple the Io torus to the jovian ionosphere. The mass of the torus builds up to an amount that the magnetic forces cannot contain and the plasma, first slowly and then more rapidly, drifts outward. Numerous authors have treated this problem based first on the observations of the Pioneer 10 and 11 flybys; then on Voyager 1 and 2, and...
Topics: NASA Technical Reports Server (NTRS), IO, PLANETARY MAGNETIC FIELDS, TORUSES, PLANETARY...
Scaling laws for possible outer planet magnetospheres are derived. These suggest that convection and its associated auroral effects will play a relatively smaller role than at earth, and that there is a possibility that they could have significant radiation belts of energetic trapped particles.
Topics: NASA Technical Reports Server (NTRS), AURORAS, CONVECTION CURRENTS, PLANETARY MAGNETOSPHERES,...
High resolution radio observations of Jupiter were investigated with the use of the Stanford synthesis telescope. The best fit disk was computed from the emission of Jupiter and the residual brightness, due to nonthermal mechanisms was measured.
Topics: NASA Technical Reports Server (NTRS), HIGH RESOLUTION, JUPITER (PLANET), MICROWAVES, PLANETARY...
An important development in the Earth magnetosphere was the discovery of the boundary of the plasma sheet and its apparent role in the dynamics of the magnetotails. Three instabilities (negative energy mode, counterstreaming, and the Buneman instability) were investigated through analytical and numerical studies of their frequency and growth rate as a function of the angle of propagation.
Topics: NASA Technical Reports Server (NTRS), MAGNETOHYDRODYNAMIC STABILITY, PLANETARY MAGNETOSPHERES,...
Jupiter's largest satellite Ganymede is unique because it possesses an internal magnetic field strong enough to create a small magnetosphere around the satellite. The interaction between Ganymede's magentosphere and the Jovian magnetic field and magnetospheric plasma generates classic polar auroral emissions from Ganymede which have been captured in a series of stunning ultraviolet images using the Hubble Space Telescope on six different dates from 1998 to 2012. Analysis of these images...
Topics: NASA Technical Reports Server (NTRS), GANYMEDE, HUBBLE SPACE TELESCOPE, PLANETARY MAGNETOSPHERES,...
To assess the role of spacecraft charging near Jupiter, the plasma distribution in Jupiter's magnetosphere was modeled using data from the plasma analyzer experiments on Pioneer 10 (published results) and on Pioneer 11 (preliminary results). In the model, electron temperatures are kT = 4 eV throughout, whereas proton temperatures range over 100 or equal to kT or equal to 400 eV. The model fluxes and concentrations vary over three orders of magnitude among several corotating regions, including,...
Topics: NASA Technical Reports Server (NTRS), JUPITER (PLANET), MODELS, PLANETARY MAGNETOSPHERES,...
The synchrotron radiation expected at Earth from the region L=2.9-5 R sub J of Jupiter's magnetosphere is calculated using the Pioneer 10 electron model. The result is approximately 21 flux units (f.u.). This value is to be compared with 6.0 + or - 0.7 f.u., the flux density of synchrotron radiation measured from Jupiter's entire magnetosphere in ground-based radio observations. Most of the radiation at 375 cm is emitted by electrons in the 1 to 10 MeV range. If the electron model used for...
Topics: NASA Technical Reports Server (NTRS), ELECTROMAGNETIC SPECTRA, ELECTRON RADIATION, JUPITER...
The low latitude boundary layer (LLBL) is a region where solar wind momentum and energy is transferred to the magnetosphere. Enhanced "broadband" electric plasma waves from less than 5 Hz to 10(exp 5) Hz and magnetic waves from less than 5 Hz to the electron cyclotron frequency are characteristic of the LLBL. Analyses of Polar plasma waves show that these "broadband" waves are actually discrete electrostatic and electromagnetic modes as well as solitary bipolar pulses...
Topics: NASA Technical Reports Server (NTRS), PLASMA WAVES, POLAR CAPS, WAVE-PARTICLE INTERACTIONS, DATA...
Solutions are given for the diffusion of trapped particles in a planetary magnetic field in which the first and second adiabatic invariants are preserved but the third is not, using as boundary conditions a fixed density at the outer boundary (the magnetopause) and a zero density at an inner boundary (the planetary surface). Losses to an orbiting natural satellite are included and an approximate evaluation is made of the effects of the synchrotron radiation on the energy of relativistic...
Topics: NASA Technical Reports Server (NTRS), DIFFUSION THEORY, ELECTRON DIFFUSION, JUPITER (PLANET),...
The estimation of planetary magnetic fields from observations of the magnetic field gathered along a spacecraft flyby trajectory is examined with the aid of generalized inverse techniques, with application to the internal magnetic field of Jupiter. Model nonuniqueness resulting from the limited spatial extent of the observations and noise on the data is explored and quantitative estimates of the model parameter resolution are found. The presence of a substantial magnetic field of external...
Topics: NASA Technical Reports Server (NTRS), JUPITER ATMOSPHERE, PIONEER 10 SPACE PROBE, PIONEER 11 SPACE...
