271
271
Jun 19, 2010
06/10
by
NON
texts
eye 271
favorite 0
comment 0
No Abstract Available
Topics: ASTROPHYSICS, COSMIC RAYS, INTERPLANETARY MAGNETIC FIELDS, SOLAR PHYSICS
327
327
Jul 11, 2010
07/10
by
FINKE, H. O.; MARTIN, R
texts
eye 327
favorite 0
comment 0
ACOUSTICAL MEASUREMENTS AND EVALUATIONS OF AIRCRAFT NOISE WERE CARRIED OUT BY A TEAM OF UNIVERSITY PERSONNEL IN WEST GERMANY IN THE FIELDS OF ACOUSTICS, MEDICINE, PSYCHOLOGY, SOCIAL SCIENCES AND OCCUPATIONAL PSYCHOLOGY. THE MUNICH, WEST GERMANY AIRPORT WAS INVESTIGATED IN 1969. INHABITANTS NEAR THE AIRPORT WERE TESTED BY MEANS OF QUESTIONNAIRES, WHICH WERE STATISTICALLY EVALUATED.
Topics: INTERPLANETARY MAGNETIC FIELDS, SOLAR CORONA, PHOTOSPHERE, POLARIZATION CHARACTERISTICS, SOLAR...
767
767
Jul 11, 2010
07/10
by
NON
texts
eye 767
favorite 0
comment 0
Results of the design and manufacturing reviews on the maturity of the Skylab modules are presented along with results of investigations on the scope of the cluster risk assessment efforts. The technical management system and its capability to assess and resolve problems are studied.
Topics: COSMIC RAYS, INTERPLANETARY MAGNETIC FIELDS, INDEPENDENT VARIABLES, NEUTRONS, RADIATION DETECTORS,...
633
633
Jul 11, 2010
07/10
by
NON
texts
eye 633
favorite 0
comment 0
A compilation is presented for the dissemination of information on technological developments which have potential utility outside the aerospace and nuclear communities. Studies include theories and mechanical considerations in the transfer of heat and the thermodynamic properties of matter and the causes and effects of certain interactions.
Topics: INTERPLANETARY MAGNETIC FIELDS, OGO-C, OGO-3, OGO-4, MAGNETIC DISTURBANCES, SATELLITE OBSERVATION
320
320
Jun 2, 2011
06/11
by
Ross, R. G., Jr.; Boyle, R. F.; Kittel, P
texts
eye 320
favorite 0
comment 0
Mechanical cryocoolers represent a significant enabling technology for NASA's Earth and Space Science missions. An overview is presented of ongoing cryocooler activities within NASA in support of current flight projects, near-term flight instruments, and long-term technology development. NASA programs in Earth and space science observe a wide range of phenomena, from crop dynamics to stellar birth. Many of the instruments require cryogenic refrigeration to improve dynamic range, extend...
Topics: INTERPLANETARY MAGNETIC FIELDS, INTERPLANETARY SPACE, PENETRATION, CUSPS (LANDFORMS), BOUNDARIES,...
357
357
May 31, 2011
05/11
by
Nettles, A. T.; Tygielski, P. J.; Delay, T. K.; Walker, J. L
texts
eye 357
favorite 0
comment 0
Since composite laminates are beginning to be identified for use in reusable launch vehicle propulsion systems, a task was undertaken to assess the feasibility of making cryogenic feedlines with integral flanges from polymer matrix composite materials. An additional level of complexity was added by having the feedlines be elbow shaped. Four materials, each with a unique manufacturing method, were chosen for this program. Feedlines were to be made by hand layup (HLU) with standard autoclave...
Topics: SOLAR WIND, COUPLING, INTERPLANETARY MAGNETIC FIELDS, WIND MEASUREMENT, SPACE WEATHER, TEMPORAL...
Possible relationships are examined between the latitude of a discontinuity in the interplanetary magnetic field for a period prior to sudden storm commencements and the probability of sudden storm commencement-triggered negative bays.
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY MAGNETIC FIELDS, MAGNETIC STORMS,...
145
145
Jun 27, 2010
06/10
by
NON
texts
eye 145
favorite 0
comment 0
Meteorological weather observations by planned Japanese satellite
Topics: EXPLORER 34 SATELLITE, GEOMAGNETIC TAIL, NEUTRAL PARTICLES, SHEETS, INTERPLANETARY MAGNETIC FIELDS,...
A magnetic dipole rotating around an axis perpendicular to the rotation axis of the sun can account for the characteristics of the surface large-scale solar magnetic fields through the solar cycle. The polarity patterns of the interplanetary magnetic field, predictable from this model, agree with the observed interplanetary magnetic sector structure.
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY MAGNETIC FIELDS, MAGNETIC DIPOLES,...
High time resolution measurements of the interplanetary magnetic field and plasma reveal a complex microstructure which includes hydromagnetic wave and discontinuities. The identification of hydromagnetic waves and discontinuities, their statistical properties, their relation to large-scale structure, and their relative contribution to power spectra are discussed.
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY MAGNETIC FIELDS, MICROSTRUCTURE,...
The recently discovered relation between the azimuthal component of the interplanetary magnetic field and magnetic variations in the earth's polar caps is reviewed. When the IMF azimuthal component is positive (typical of an interplanetary sector with magnetic field directed away from the sun) geomagnetic perturbations directed away from the earth are observed within 8 deg from the corrected geomagnetic pole. When the IMF azimuthal component is negative (typically within toward sectors) the...
Topics: NASA Technical Reports Server (NTRS), AZIMUTH, GEOMAGNETISM, INTERPLANETARY MAGNETIC FIELDS, POLAR...
246
246
Jun 15, 2011
06/11
by
Kats, M. YE., et al
texts
eye 246
favorite 0
comment 0
Fast proton peak accompanying solar flare connected to acceleration of charged particles in interplanetary plasma
Topics: COSMIC PLASMA, INHOMOGENEITY, INTERPLANETARY MAGNETIC FIELDS, EQUATIONS OF MOTION,...
284
284
Jun 1, 2010
06/10
by
Dorman, L. I.; Nosov, Yu. G
texts
eye 284
favorite 0
comment 0
Charged particle electromagnetic scattering by interplanetary magnetic fields of simplest configuration
Topics: CHARGED PARTICLES, ELECTROMAGNETIC SCATTERING, INTERPLANETARY MAGNETIC FIELDS, INTERSTELLAR...
Model cross sections of the high latitude dawn-dusk electric field based on OGO-6 data are presented for the signature profiles, most frequently encountered for both + and -Y orientations of the interplanetary magnetic field. Line integrals give a total potential of 76 keV in each case. To illustrate extremes, examples of model cross-sections with total potentials of 23 keV and 140 keV are also given. Model convection patterns are also presented utilizing OGO-6 data on boundary locations at...
Topics: NASA Technical Reports Server (NTRS), ELECTRIC FIELDS, POLAR REGIONS, CONVECTION, INTERPLANETARY...
The causes of geomagnetic activity are studied both theoretically in terms of the reconnection model and empirically using the am-index and interplanetary solar wind parameters. It is found that two separate mechanisms supply energy to the magnetosphere. One mechanism depends critically on the magnitude and direction of the interplanetary magnetic field. Both depend strongly on solar wind speed. The energy input is modulated by the tilt of the dipole axis being maximum for 90 deg tilt against...
Topics: NASA Technical Reports Server (NTRS), EARTH MAGNETOSPHERE, GEOMAGNETISM, ANNUAL VARIATIONS,...
Examination of possible noise sources in the measurement of the power spectrum of fluctuations in the interplanetary magnetic field shows that most measurements by fluxgate magnetometers are limited by digitization noise whereas the search coil magnetometer is limited by instrument noise. The folding of power about the Nyquist frequency or aliasing can be a serious problem at times for many magnetometers, but it is not serious during typical solar wind conditions except near the Nyquist...
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY MAGNETIC FIELDS, POWER SPECTRA, MAGNETOMETERS,...
Spacecraft observations near the earth of the yearly average direction of the interplanetary magnetic field during the sunspot maximum year 1968 showed a deviation from the spiral field. The angle between the average field direction when the field polarity was away from the sun and the average direction for toward polarity was 168 deg, rather than 180 deg. This effect appears to have a sunspot cycle variation.
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY MAGNETIC FIELDS, SUNSPOTS, POLARITY, SOLAR...
380
380
May 31, 2011
05/11
by
Feinberg, Arthur; Tauss, Jame
texts
eye 380
favorite 0
comment 0
Weather is a contributing factor in approximately 25-30 percent of general aviation accidents. The lack of timely, accurate and usable weather information to the general aviation pilot in the cockpit to enhance pilot situational awareness and improve pilot judgment remains a major impediment to improving aviation safety. NASA Glenn Research Center commissioned this 120 day weather datalink market survey to assess the technologies, infrastructure, products, and services of commercial avionics...
Topics: GEOMAGNETISM, SOLAR ACTIVITY EFFECTS, SOLAR CYCLES, SOLAR WIND, INTERPLANETARY MAGNETIC FIELDS,...
Diffusion and scatter free cosmic ray propagation theories are discussed in terms of the quality of their alternate viewpoints. A hypothetical model of conditions in interplantary space is described which aids in the comparison. A plot of the intensity of the interplanetary magnetic field over a long period is presented, and the association of these regions with high velocity streams is shown to support the scatter free viewpoint.
Topics: NASA Technical Reports Server (NTRS), COSMIC RAYS, PROPAGATION MODES, DIFFUSION, HYPOTHESES,...
This report is an extension of 'An Atlas of Interplanetary Sector Structure 1957-1974' to include earlier years back to 1947 and also the years 1932-1933 and 1975.
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY MAGNETIC FIELDS, INTERPLANETARY SPACE, POLAR...
The meaning and characteristics of basic and average convection (i.e., electric field) patterns are described. The continuous existence of the basic convection pattern argues against treating magnetic field merging mechanisms as the fundamental cause of magnetospheric convection. However, whether related to merging or some other mechanism, interplanetary (IP) magnetic field conditions significantly modulate the distribution, magnitudes, and boundaries of the convection pattern. A previous...
Topics: NASA Technical Reports Server (NTRS), ELECTRIC FIELDS, INTERPLANETARY MAGNETIC FIELDS, POLAR...
190
190
Jun 1, 2010
06/10
by
Dolginov, Sh. SH.; Pushkov, N. V.; Yeroshenko, E. G.; Zhuzgov, L. N
texts
eye 190
favorite 0
comment 0
Magnetic field variations measurements aboard automatic interplanetary station
Topics: GEOMAGNETISM, INTERPLANETARY MAGNETIC FIELDS, MAGNETIC FIELDS, MAGNETIC MEASUREMENT, SPACE...
A cross correlation analysis of coronal green line intensity (5303A) and interplanetary magnetic field polarity for the period 1947-1970 shows that the coronal features are organized in a constant pattern with respect to the 4-sector structure through the solar cycle. A sudden inversion of the coronal pattern with respect to the sector structure takes place at the solar minima. The high emission regions of the green corona are located near the solar magnetic sector boundaries having polarities...
Topics: NASA Technical Reports Server (NTRS), CORONAS, INTERPLANETARY MAGNETIC FIELDS, INVERSIONS, CROSS...
283
283
May 23, 2011
05/11
by
Kossentini, Faouzi; Chung, Wilson C.; Smith, Mark J. T
texts
eye 283
favorite 0
comment 0
This paper introduces an extension of entropy-constrained residual vector quantization (VQ) where intervector dependencies are exploited. The method, which we call conditional entropy-constrained residual VQ, employs a high-order entropy conditioning strategy that captures local information in the neighboring vectors. When applied to coding images, the proposed method is shown to achieve better rate-distortion performance than that of entropy-constrained residual vector quantization with less...
Topics: MAGNETOHYDRODYNAMICS, ENERGY LEVELS, STELLAR MASS, MAGNETIC FIELDS, VELOCITY DISTRIBUTION, DYNAMIC...
The relationship between neutron monitor variations and the intensity variations of the interplanetary magnetic field is studied, using Deep River data and IMP-series satellite data. In over 80% of the cases studied, identifiable depressions of the cosmic ray intensity are associated with magnetic field enhancements of several hours duration and intensity above 10 gamma. Conversely, each magnetic field enhancement has an identifiable effect (though not necessarily a marked depression) on the...
Topics: NASA Technical Reports Server (NTRS), COSMIC RAYS, FORBUSH DECREASES, AMPLITUDES, IMP,...
641
641
Jul 25, 2010
07/10
by
Connors, Alann
texts
eye 641
favorite 0
comment 0
In the HEAO 1 A-2 survey of fast X-ray transients, a search of 2 to 20 keV scanning data was made for brief increases in flux, greater than 4 millicrabs, on timescales approximately 1 to 10 to the 4th s above a 12-hour average. The search was divided into two regions, and all-sky survey of the Galaxy, and a survey of the Magellanic Clouds. In the latter, 37 events were found and identified with 4 of the 5 brighest sources in the LMC, plus 2 as flares from a foreground star. Np X-ray bursts, no...
Topics: DATA BASE MANAGEMENT SYSTEMS, SPACE PLASMAS, VELOCITY, HANDBOOKS, INTERPLANETARY MEDIUM,...
Variations in the scalar magnetic field (delta B) from the polar orbiting OGO 2, 4, and 6 spacecraft are examined as a function of altitude for times when the interplanetary magnetic field is toward the sun and for times when the interplanetary magnetic field away from the sun. This morphology is basically the same as that found when all data, irrespective of interplanetary magnetic sector, are averaged together. Differences in delta B occur, both between sectors and between seasons, which are...
Topics: NASA Technical Reports Server (NTRS), EARTH MAGNETOSPHERE, INTERPLANETARY MAGNETIC FIELDS, OGO,...
A green line intensity variation is associated with the interplanetary and photospheric magnetic sector structure. This effect depends on the solar cycle and occurs with the same amplitude in the latitude range 60 deg N - 60 deg S. Extended longitudinal coronal structures are suggested, which indicate the existence of closed magnetic field lines over the neutral line, separating adjacent regions of opposite polarities on the photospheric surface.
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY MAGNETIC FIELDS, SOLAR CORONA, PHOTOSPHERE,...
Treated jointly, two recent results imply that the distribution of winds in the polar ionosphere should change as a function of the direction of the interplanetary magnetic field. (1) From the motions of chemically released ion and neutral clouds, it is apparent that neutral winds in the high latitude ionosphere are driven principally by ion drag forces. (2) OGO-6 electric field measurements have demonstrated that there are definite relationships between the time-latitude distribution of...
Topics: NASA Technical Reports Server (NTRS), EARTH IONOSPHERE, INTERPLANETARY MAGNETIC FIELDS, SOLAR WIND,...
The functional requirements for the vector helium magnetometer (VHM) on the Solar Polar spacecraft are presented. The VHM is one of the two magnetometers on board that will measure the vector magnetic field along the Earth to Jupiter transfer trajectory, as well as in the vicinity of Jupiter and along the solar polar orbit following the Jupiter encounter. The interconnection between these two magnetometers and their shared data processing unit is illustrated.
Topics: NASA Technical Reports Server (NTRS), ELECTRONIC PACKAGING, FUNCTIONAL DESIGN SPECIFICATIONS,...
In a consideration of only those periods when the delay time from the interplanetary observing position to the magnetosphere is less than 5 minutes, it is found that, irrespective of substorm activity: (1) The 45 minute average value of interplanetary B(z) predicts the latitudes of the poleward and equatorward boundaries of polar cusp electron precipitation with rms errors of 1.34 deg and 1.16 deg respectively; (2) Both boundaries more equatorward by about 5 deg as B(z) varies from 1 to -6...
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY MAGNETIC FIELDS, MAGNETIC FLUX, POLAR CAPS,...
295
295
May 23, 2011
05/11
by
Rose, Cheryl A.; Starnes, James H., Jr
texts
eye 295
favorite 0
comment 0
An efficient, approximate analysis for calculating complete three-dimensional stress fields near regions of geometric discontinuities in laminated composite structures is presented. An approximate three-dimensional local analysis is used to determine the detailed local response due to far-field stresses obtained from a global two-dimensional analysis. The stress results from the global analysis are used as traction boundary conditions for the local analysis. A generalized plane deformation...
Topics: CONVECTION CELLS, WIND VELOCITY, INTERPLANETARY MAGNETIC FIELDS, MAGNETOHYDRODYNAMIC FLOW, PLASMA...
An objective method of inferring the polarity of the interplanetary magnetic field using the H-component at Godhavn is presented. The objectively inferred polarities are compared with a subjective index inferred earlier. It is concluded that no significant difference exists between the two methods. The inferred polarities derived from Godhavn H is biased by the (slp) sub q signature in the sense that during summer prolonged intervals of geomagnetic calm will result in inferred Away polarity...
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY MAGNETIC FIELDS, MAGNETOMETERS, POLARITY,...
It is known from the Apollo magnetometer experiments that significant electromagnetic induction takes place in the lunar interior. This induction is excited by fluctuations of the interplanetary magnetic field and is detected by the induced fields on the surface of the moon. These results are reviewed briefly and the formal properties of the theory are discussed. It is shown that the mathematical treatment parallels that for classical electromagnetic scattering. Further the wavelength spectrum...
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY MAGNETIC FIELDS, MIE SCATTERING, MOON,...
A suggestion by McDiarmid and Budzinski that an annual variation of geomagnetic activity can explain a sector polarity asymmetry is shown not to be necessary. The correct explanation is that the Kp-index exhibits systematic errors that enhance the UT variation during Toward polarity and decrease the UT variation during Away polarity.
Topics: NASA Technical Reports Server (NTRS), ANNUAL VARIATIONS, INTERPLANETARY MAGNETIC FIELDS, KP INDEX,...
Currently there is an active international flotilla of spacecraft that continuously observe and measure the dynamic space environment that surrounds our planet. These spacecraft have remote sensors for photons and particles, and in situ instruments for plasmas, fields and particles. They provide the data input to guide, motivate, and validate predictive space weather models used by decision makers and for a myriad of scientific investigations. This talk will briefly survey the current Geospace...
Topics: NASA Technical Reports Server (NTRS), SPACE WEATHER, REMOTE SENSORS, AEROSPACE ENVIRONMENTS, EARTH...
Data from the auroral particles experiment on OGO-4 were used to study effects of substorm activity, interplanetary magnetic field latitutde, and dipole tilt angle on high-latitude precipitation of 700 eV electrons. It was found that: (1) The high-latitude zone of 700 eV electron precipitation in late evening and early morning hours moves equatorward by 5 to 10 deg during substorms. (2) The low-latitude boundary of polar cusp electron precipitation at 9 to 15 hours MLT also moves equatorward by...
Topics: NASA Technical Reports Server (NTRS), ELECTRON PRECIPITATION, INTERPLANETARY MAGNETIC FIELDS,...
340
340
Jul 26, 2010
07/10
by
NON
texts
eye 340
favorite 0
comment 0
No Abstract Available
Topics: DATA BASES, PROGNOZ SATELLITES, INFORMATION SYSTEMS, INTERPLANETARY MAGNETIC FIELDS, INTERPLANETARY...
Detailed models of the electric field of the magnetosphere are derived in several stages. For all, the conductivity along field lines is assumed to be high enough to ensure the vanishing of E B everywhere except in the ionosphere. At first the rotation of the earth is ignored completely and a simple model is constructed which fits certain observed properties. Next, the rotation of the earth is taken into account, but the field is assumed to be that of a magnetic dipole rotating around its...
Topics: NASA Technical Reports Server (NTRS), EARTH MAGNETOSPHERE, EARTH ROTATION, ELECTRIC FIELDS,...
274
274
May 23, 2011
05/11
by
Anderson, Brian; Bradley, Michael; Ives, Jane
texts
eye 274
favorite 0
comment 0
A Space Shuttle Main Engine (SSME) test program was conducted between August 1995 and May 1996 using the Technology Test Bed (TTB) Engine. SSTO vehicle studies have indicated that increases in the propulsion system operating range can save significant weight and cost at the vehicle level. This test program demonstrated the ability of the SSME to accommodate a wide variation in safe operating ranges and therefore its applicability to the SSTO mission. A total of eight tests were completed with...
Topics: SOLAR WIND, SOLAR PHYSICS, FIELD ALIGNED CURRENTS, EARTH MAGNETOSPHERE, MAGNETIC STORMS,...
331
331
Jul 11, 2010
07/10
by
DEMBOVSKIY, A. V.; ISKOV, M. N.; LISIN, O. G
texts
eye 331
favorite 0
comment 0
THE PHOTODISSOCIATION RATE OF CO2 IN THE ATMOSPHERES OF MARS AND VENUS WAS CALCULATED. ALSO CALCULATED WAS THE HEAT LIBERATION AND INTENSITIES OF EMISSIONS ASSOCIATED WITH PHOTODISSOCIATION. THE TOTAL BULK PHOTODISSOCIATION RATE MONOTONELY DECREASED WITH ALTITUDE THROUGHOUT THE THERMOSPHERE. THE ROLE OF VARIOUS PHOTODISSOCIATION CHANNELS WITH EXCITATION VARIES WITH ALTITUDE. HEAT LIBERATION DUE TO PHOTODISSOCIATION IN THE LOWER THERMOSPHERE (AT ALTITUDES BELOW APPROXIMATELY 115 KM IN MARS AND...
Topics: EARTH MAGNETOSPHERE, SPACECRAFT MODELS, GEOPHYSICS, INTERPLANETARY MEDIUM, SOLAR PHYSICS, STELLAR...
The effects of magnetic field annihilation at a tangential or rotational discontinuity in a resistive plasma are examined. The magnetic field intensity profile depends on (1) the field intensities far from the current sheet (+ and - infinity), (2) the angle between the two intensities, and (3) the electrical resistivity. For a tangential discontinuity, the theory predicts a depression in B, centered at the discontinuity, and it predicts a monotonic transition. The theory provides satisfactory...
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY MAGNETIC FIELDS, MAGNETIC FLUX, ELECTRICAL...
The goal of this one-year project was to use data from the Polar satellite in conjunction with global simulations of Earth's magnetosphere to investigate phenomena in the high-latitude magnetosphere. Specifically, we addressed reconnection at the cusp during periods of northward interplanetary magnetic field (IMF), and the effects of substorms on the high-latitude magnetosphere.
Topics: NASA Technical Reports Server (NTRS), EARTH MAGNETOSPHERE, INTERPLANETARY MAGNETIC FIELDS, POLAR...
The maximum disturbances from the positive and negative regions of delta B (Bp and Bn, respectively) are investigated with respect to their correlation with (1) the average N-S component, Bz, (2) the average angle with respect to the solar magnetospheric equatorial plane, theta (3) the variance, sigma sub i, and (4) the magnitude, Bi, of the interplanetary magnetic field. These quantities were averaged over a period, T, ranging from 20 min. to 8 hours prior to the measurement of Bp or Bn....
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY MAGNETIC FIELDS, OGO-C, OGO-3, OGO-4, MAGNETIC...
Two time periods are studied for which comprehensive data coverage is available at both 1 AU using IMP-8 and ISEE-3 and beyond using Voyager 1. One of these periods is characterized by the predominance of corotating stream interactions. Relatively small scale transient flows characterize the second period. The evolution of these flows with heliocentric distance is studied using power spectral techniques. The evolution of the transient dominated period is consistent with the hypothesis of...
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY MAGNETIC FIELDS, MAGNETOHYDRODYNAMICS, SOLAR...
1,043
1.0K
Sep 20, 2010
09/10
by
Landis, Linda; Waligora, Sharon; Mcgarry, Frank; Pajerski, Rose; Stark, Mike; Johnson, Kevin Orlin; Cover, Donn
texts
eye 1,043
favorite 0
comment 0
Guidelines for an organized, disciplined approach to software development that is based on studies conducted by the Software Engineering Laboratory (SEL) since 1976 are presented. It describes methods and practices for each phase of a software development life cycle that starts with requirements definition and ends with acceptance testing. For each defined life cycle phase, guidelines for the development process and its management, and for the products produced and their reviews are presented.
Topics: COSMIC RAYS, STELLAR MASS EJECTION, ENERGETIC PARTICLES, FORBUSH DECREASES, MAGNETIC STORMS,...
A theoretical study is presented of the Alfven waves in the spiral interplanetary magnetic field. The Alfven waves under consideration are arbitrary, large amplitude, non-monochromatic, microscale waves of any polarization. They superpose on a mesoscale background flow of thermally anisotropic plasma. Using WKB approximation, an analytical solution for the amplitude vectors is obtained as a function of the background flow properties: density, velocity, Alfven speed, thermal anisotropy, and the...
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY MAGNETIC FIELDS, MAGNETOHYDRODYNAMIC WAVES,...
Pioneer 9's magnetic field and plasma data were studied to develop arguments for or against the observation of oblique interplanetary shocks. Structural classifications are defined, and the justification for seeking these classifications in the solar wind are presented.
Topics: NASA Technical Reports Server (NTRS), INTERPLANETARY MAGNETIC FIELDS, OBLIQUE SHOCK WAVES, COMPUTER...
Patterns of the precipitation of low energy electrons observed by polar satellites were examined as functions of substorm phase. Precipitation boundaries are generally identifiable at the low latitude edge of polar cusp electron precipitation and at the poleward edge of precipitation in the premidnight sector. Both of these boundaries move equatorward when the interplanetary magnetic field turns southward.
Topics: NASA Technical Reports Server (NTRS), ELECTRON PRECIPITATION, MAGNETIC STORMS, SATELLITE...
The data from the world wide grid of neutron monitoring stations was analyzed for a comparative study of the phase of diurnal anisotropy on quiet and disturbed days on a long term basis up to recent period. It has been observed that the phase of the diurnal anisotropy on disturbed days where the value of the Ap-index is higher, is found to shift towards earlier hours in comparison to the phase of the diurnal anisotropy on quiet days where the value of Ap-index is lower on all the stations from...
Topics: NASA Technical Reports Server (NTRS), ANISOTROPY, ATMOSPHERIC PRESSURE, COSMIC RAYS, DIURNAL...
