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  • GEOPHYSICS  (9)
  • Documentation and Information Science  (2)
  • 1
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    Interplanetary space science data base and access/display tool on the NSSDC heliospheric CD-ROM (1995)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The National Space Science Data Center (NSSDC) has accumulated a rich archive of heliospheric, magnetospheric, and ionospheric data, as well as data from most other NASA-involved science disciplines. To facilitate access to and use of these data, NSSDC has begun to put selected data onto CD-ROM's. This paper describes one such CD-ROM, and the access and display software developed at NSSDC to support its use. The data on the CD-ROM consist primarily of hourly solar wind magnetic field and plasma data from many near-Earth spacecraft (OMNI) and deep space spacecraft (Voyagers, Pioneers, Helios, Pioneer Venus Orbiter). In addition, 5-minute resolution IMP-8 and ISEE-3 magnetic field and plasma data are also included. Data are stored in both ASCII and CDF formats.
    Keywords: Documentation and Information Science
    Type: Visualization techniques in space and atmospheric sciences; 65-73; NASA-SP-519
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  • 2
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    Highly relativistic magnetospheric electrons - A role in coupling to the middle atmosphere? (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Twenty-seven-day periodic enhancements of the relativistic electrons are observed in association with concurrently measured solar wind streams, and a numerical transport code is used to investigate the coupling of these high-energy electrons to earth's upper and middle atmosphere. When precipitated, these electrons are found to show a large energy deposition at 40-60 km altitude which is 3-4 orders of magnitude greater than the galactic cosmic ray or solar EUV energy deposition at these altitudes. It is suggested that this electron population could play a role in coupling solar wind and magnetospheric variability to the middle atmosphere through a modulating effect on lower D-region ionization and possibly on upper level ozone chemistry.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 14; 1027-103
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  • 3
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    Coupling between the solar wind and the magnetosphere - CDAW 6 (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: It is pointed out that an extensive study of the causes and manifestations of geomagnetic activity has been carried out as part of the sixth Coordinated Data Analysis Workshop, CDAW 6. The present investigation has the objective to determine the coupling between the solar wind and the magnetosphere for the two selected analysis intervals, taking into account, as a basis for the study, the interplanetary field and plasma observations from ISEE 3 and IMP 8 and the geomagnetic activity indicators developed by CDAW 6 participants. The method of analysis employed is discussed, giving attention to geomagnetic indices, upstream parameters, and a cross-correlation analysis. In a description of the obtained results, the March 22, 1979 event is considered along with the March 31 to April 1, 1979 event, and an intercomparison of the events. The relationship between interplanetary indices and the resulting geomagnetic activity for the two CDAW 6 intervals is illustrated.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 1191-119
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  • 4
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    Plasma electron observations in the vicinity of magnetic holes (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: In the present study, 14 events of interplanetary magnetic field dips are identified. Eleven of these are found to be associated with significant enhancements in the flux of electrons of energies of approximately 100 eV. Five (of the eleven) are characterized by significant changes in the magnetic field direction, and six are not. Thus, even though an electron enhancement is usually seen at a dip, the enhancement need not be always associated with magnetic reconnection, for which a directional change is essential. It appears that some events involve local acceleration, possibly the results of reconnection, while others may involve electrons injected onto the field line at a remote point.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 84; Sept. 1
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  • 5
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    Availability of IMP-7 and IMP-8 data for the IMS period (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The relation of IMP-7 and IMP-8 data to the International Magnetospheric Study is discussed. Relevant spacecraft and experiment characteristics, and the nature and accessibility of data from each experiment, are identified. Finally the potential value of IMP data in IMS studies is illustrated with a few citations from the IMP Bibliography and with figures from a recent multiple-data-set magnetotail plasma sheet study.
    Keywords: GEOPHYSICS
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  • 6
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    Effect of the interplanetary magnetic field y component on the high-latitude nightside convection (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Sondrestrom radar observations reveal that the dawn-dusk (By) component of the interplanetary magnetic field (IMF) strongly influences the nightside polar convection. This effect is quite complex. The convection for one orientation of By is not the mirror image of the other orientation. A positive By (i.e., pointing toward dusk) seems to organize the velocities such that, at all local times, they are predominantly westward within the radar field-of-view (approximately 68 deg-to-82 deg invariant latitude). Between dusk and midnight, on one such occasion, sunward flow is observed within the polar cap. In the midnight and dawn sectors, when By is negative, the plasma velocities often appear shifted toward early hours such that large southward velocities are observed about 3 hours before midnight. These are the only times when the predominant velocity component is southward.
    Keywords: GEOPHYSICS
    Type: AD-A164066 , AFOSR-TR-85-1249 , Geophysical Research Letters (ISSN 0094-8276); 12; 461-464
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  • 7
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    On the complex state of the interplanetary medium of July 28-29, 1977 (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: (Previously announced in STAR as N81-20996)
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 87; Aug. 1
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  • 8
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    Comparison of polar cap potential drops estimated from solar wind and ground magnetometer data - CDAW 6 (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: It is pointed out that the maximum electrostatic potential difference across the polar cap, Phi, is a fundamental measure of the coupling between the solar wind and the earth's magnetosphere/ionosphere sytem. During the Coordinated Data Analysis Workshop (CDAW) 6 intervals, no suitably instrumented spacecraft was in an appropriate orbit to determine the polar-cap potential drop directly. However, two recently developed independent techniques make it possible to estimate the polar-cap potential drop for times when direct spacecraft data are not available. The present investigation is concerned with a comparison of cross-polar-cap potential drop estimates calculated for the two CDAW 6 intervals on the basis of these two techniques. In the case of one interval, the agreement between the potential drops and Joule heating rates is relatively good. In the second interval, however, the agreement is not very good. Explanations for this discrepancy are discussed.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 1318-132
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  • 9
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    Cross-polar cap potential drop and the energy coupling function (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A numerical model is formulated for correlations between the cross polar cap potential, the solar wind, and the AI index and compared with satellite data. The conductivity model was devised from empirically defined relationships between the Hall and Pedersen conductivities and the measured magnitude of the horizontal magnetic disturbance near College, AK. An instantaneous conductivity distribution was generated from data gathered at, e.g., six IMS meridian chain stations. A strong correlation appeared between an energy coupling function (ECF) and the polar cap potential drop. The ECF was derived from the chain station data, implying that potential drop estimates can be made from ground-based magnetometer data.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 11028-11
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  • 10
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    Sondrestrom radar observations of the effect of the IMF B(y) component on polar cap convection (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Sondrestrom incoherent-scatter radar measurements of plasma drift in the auroral oval and the polar cap are used to examine the effect of the IMF B(y) component in the dusk, midnight, and dawn sectors. The individual radar observations are briefly reviewed, and the average convection patterns obtained by binning the drift data for the two orientations of the IMF B(y) component are shown. These patterns are compared to the various models of convection that have been proposed. None of the models seem to reproduce the observed convections well, although some features of the models are seen in the radar data.
    Keywords: GEOPHYSICS
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