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  • 1
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    Interplanetary magnetic field control of high-latitude activity on July 29, 1977 (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Multisatellite particle and magnetic field data for the substorms of July 29, 1977, show auroral-like activity above 80 deg invariant latitude during the recovery period. The movement of auroral zone activity to high latitudes followed the substorm sequence, at which time the inferred interplanetary magnetic field (IMF) was strongly northward. Electron energy spectra indicative of a field-aligned potential drop, and the absence of supporting precipitating ions, are found at latitudes greater than 80 deg. The north-south symmetry of these observations suggests that the events are on closed field lines. It is noted the very strong northward IMF connected to the sunward tilted geomagnetic dipole field plays a role in the driving of strong Birkeland and ionospheric current systems in the northern polar regions, while eliminating them from the southern polar regions.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 87; Aug. 1
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  • 2
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    Aerospace spacecraft-charging guidelines document (1985)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: A short summary document on spacecraft charging was prepared for use by engineers in the various Aerospace Corporation program offices that support Air Force Space Division programs. The magnetospheric charging environment at near-geosynchronous altitudes is outlined and the mechanisms of charging and discharging are discussed. Statistical results from the P78-2 (SCATHA) satellite engineering experiments are given. The document is intended to be a layman's source for charging information and for design guidance and criteria.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Lewis Research Center Spacecraft Environ. Interactions Technol., 1983; p 391
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  • 3
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    The 8 February 1986 magnetospheric compression event - Observations of simultaneous magnetospheric leakage and specularly reflected solar wind ions (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Multi-satellite observations of energetic particle were made during the magnetospheric compression event of February 8, 1986. In the upstream region in the interplanetary medium (IPM) observations were made of magnetospheric leakage particles and specularly reflected solar wind ions.
    Keywords: GEOPHYSICS
    Type: Advances in Space Research (ISSN 0273-1177); 8; 9-10,
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  • 4
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    P78-2 satellite and payload responses to electron beam operations on March 30, 1979 (1980)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: The operating modes of the SC4-1 payload, the resultant charging of the spacecraft frame and sample materials on the spacecraft exterior and recorded transient pulses are reported. Arcing was detected by pulse monitors in several electron beam modes of operation. The ejection of a beam of 6 mA of 3 keV electrons caused three distinct payload failures and created a transient problem in the telemetry system. The exact time, nature, and cause of these failures was determined and component failure and why they failed was identified. Analytical and modeling techniques are used to examine possible spacecraft and payload responses to the electron beam ejection which might have contributed to the arcing and payload failures.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Lewis Research Center Spacecraft Charging Technol., 1980; p 509-559
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  • 5
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    Science Mission Definition Studies for TROPIX (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This document summarizes the results of mission definition studies for solar electric propulsion missions that have been carried out over the last approximately three years. The major output from the studies has been two proposals which were submitted to NASA in response to Announcements of Opportunity for missions and an ongoing Global Magnetospheric Dynamics mission study. The bulk of this report consists of copies of the proposals and preliminary materials from the GMD study that will be completed in the coming months.
    Keywords: Spacecraft Propulsion and Power
    Type: NASA/CR-97-206775 , NAS 1.26:206775
    Format: application/pdf
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  • 6
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    RAPID: The imaging energetic particle spectrometer on Cluster (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The RAPID spectrometer for the Cluster mission, an advanced particle detector for the analysis of suprathermal plasma distributions in the energy range from 20 to 400 keV and from 2 keV/nuc to 1500 keV for electrons and ions, respectively, is presented. Novel detector concepts in combination with pinhole acceptance permit the measurement of angular distributions over a range of 180 deg in polar angle for either species. The detection principle for the ionic component is based on a two dimensional analysis of a particle's velocity and energy. Electrons are identified by the well known energy range relationship. The detection techniques are described and selected areas in geospace are used to highlight the scientific objectives of this investigation.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: ESA, Cluster: Mission, Payload, and Supporting Activities; p 185-217
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  • 7
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    Auroral plasmas in the evening sector - Satellite observations and theoretical interpretations (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Previously announced in STAR as N83-74905
    Keywords: GEOPHYSICS
    Type: Space Science Reviews (ISSN 0038-6308); 35; July 198
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  • 8
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    Spatial distribution of greater than 2 ions in the outer radiation belt during quiet conditions (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Keywords: GEOPHYSICS
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  • 9
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    Mirror instability and the origin of morningside auroral structure (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Auroral optical imagery shows marked differences between auroral features of the evening and morning sectors: The separation between diffuse and discrete auroras in the evening sector is not distinct in the morning sector, which is dominated by auroral patches and multiple banded structures aligned along some direction. Plasma distribution function signatures also show marked differences: downward electron beams and inverted-V signatures prefer the evening sector, while the electron spectra on the morning sector are similar to the diffuse aurora. We have constructed a theory of morningside auroras consistent with these features. The theory is based on modulation of the growth rates of electron cyclotron waves by the mirror instability, which is in turn driven by inward-convected ions that have become anisotropic. This modulation produces alternating bands of enhanced and reduced electron precipitation which approximate the observed multiple auroral bands and patches of the morning sector.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 88; May 1
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  • 10
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    Access of solar protons to the earth's polar caps. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Energetic solar proton observations in the interplanetary medium by Explorer 33 and Explorer 35 and over the polar caps by Injun 5 during the period from September 1968 through March 1970 have been examined in detail. The solar proton intensities observed over the polar regions were compared with the interplanetary intensities on an absolute basis. The high polar latitude (HPL) proton intensities tracked the magnetic field aligned interplanetary intensities well (solar-antisolar intensities as determined from the sectored Explorer data). The tracking was in agreement with the open magnetosphere model about 90% of the time - i.e., the intensities observed on the HPL magnetic lines of force, which would be connected to magnetic lines of force from the sun in an interconnected geomagnetic and interplanetary magnetic field, were in agreement with the maximum intensity of the interplanetary proton pitch angle distribution. The intensities observed at the HPL region of the opposite polar cap were in agreement with the minimum intensity of the interplanetary pitch angle distribution. The low polar latitude intensities generally tracked the maximum interplanetary intensity very well.
    Keywords: SPACE RADIATION
    Type: Journal of Geophysical Research; 78; Mar. 1
    Format: text
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