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  • 1995-1999
  • 1980-1984  (5)
  • 1981  (5)
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  • 1995-1999
  • 1980-1984  (5)
Year
  • 1
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    ISIS observations of auroral particles and large-scale Birkeland currents (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Simultaneous electron and positive ion observations made with single-component magnetic perturbations on the ISIS-2 satellite are used to compare and contrast the relationships between primary and secondary auroral particle distributions at 5 eV-15 keV, and the large-scale Birkeland currents, in the pre- and post-midnight local time sectors. No unique relation is found between the regions of the Birkeland current system and regions of auroral particle distribution, though repeatable systematics in the region of upward-directed current are observed, and little evidence exists in either local time sector for the direct detection of the downward current-associated current carriers.
    Keywords: GEOPHYSICS
    Type: Exploration of the polar upper atmosphere; May 05, 1980 - May 16, 1980; Lillehammer; Norway
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Transversely accelerated ions in auroral arcs (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Ionospheric ions apparently accelerated transversely to the geomagnetic field in the topside ionosphere are regularly detected by the soft particle spectrometers on the ISIS satellites. Such gyro-accelerated ions are observed in association with precipitating auroral electrons. A detailed study of their relationship with such electrons and with field-aligned currents, together with simultaneous measurements of the local plasma composition and density, reveals the specific conditions present in the topside ionosphere during the generation of such transversely accelerated ions (TAI). A proposed mechanism for generation of TAI involving acceleration by electrostatic ion cyclotron waves is consistent with the present observations.
    Keywords: GEOPHYSICS
    Type: Physics of auroral arc formation; Jul 21, 1980 - Jul 25, 1980; Fairbanks, AK
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Investigation of the effects of external current systems on the MAGSAT data utilizing grid cell modeling techniques (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Progress is reported in reading MAGSAT tapes in modeling procedure developed to compute the magnetic fields at satellite orbit due to current distributions in the ionosphere. The modeling technique utilizes a linear current element representation of the large-scale space-current system.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10232 , NASA-CR-168801 , NAS 1.26:168801 , QSTPR-4
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Investigation of the effects of external current systems on the MAGSAT data utilizing grid cell modeling techniques (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Refinements to the modeling procedure developed to compute the magnetic fields at satellite orbit due to current distributions in the ionosphere and magnetosphere are described. The modeling technique utilizes a linear current element representation of the large scale space current system. A model polar current system is presented and magnetic field perturbations resulting from this system are computed along two hypothetical satellite orbits.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10195 , NASA-CR-168622 , NAS 1.26:168622 , UTD-E0533-01 , QSTRP-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Investigation of the effects of external current systems on the MAGSAT data utilizing grid cell modeling techniques (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Efforts devoted to reading MAGSAT data tapes in preparation for further analysis of the MAGSAT data are discussed. A modeling procedure developed to compute the magnetic fields at satellite orbit due to hypothesized current distributions in the ionosphere and magnetosphere is described. This technique utilizes a linear current element representation of the large-scale space-current system. Several examples of the model field perturbations computed along hypothetical satellite orbits are shown.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10098 , NASA-CR-168405 , NAS 1.26:168405 , TPR-2
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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