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  • GEOPHYSICS  (4)
  • 1975-1979  (4)
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  • 1
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    Magnetosphere-ionosphere interactions (1979)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: The present understanding of magnetosphere ionosphere interactions is described, and present and future predictive capabilities are assessed. Ionospheric features directly coupled to the magnetosphere to a significant degree are considered, with emphasis given to those phenomena of major interest to forecasters and users.
    Keywords: GEOPHYSICS
    Type: NASA. Marshall Space Flight Center Solar-Terrest. Predictions Proc., Vol. 2; p 476-493
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Model of Birkeland currents associated with an auroral arc (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The ionospheric configuration of the vertical Birkeland currents associated with an auroral arc is calculated from a model based on the assumption that the auroral electrons constitute a net current into the ionosphere. It is further assumed that the return vertical current out of the ionosphere is impeded along the field lines which connect the arc to the magnetosphere. The magnitude, location, and structure of the return Birkeland current calculated from the model agree well with measurements of these parameters by a rocket-borne experiment.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 80; Oct. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Effect of anomalous transport coefficients on the thermal structure of the storm time auroral ionosphere (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: By analyzing an observed storm time auroral electron temperature profile it is shown that anomalous transport effects strongly influence the thermal structure of the disturbed auroral ionosphere. Such anomalous transport effects are a consequence of plasma turbulence, the existence of which has been established by a large number of observations in the auroral ionosphere. The electron and composite ion energy equations are solved with anomalous electron thermal conductivity and parallel electrical resistivity coefficients. The solutions are parameterized with respect to a phenomenological altitude-dependent anomaly coefficient A and are compared with an observed storm time electron temperature profile above Chatanika. The calculated temperature profile for the classical case (A = 1) disagrees considerably with the measured profile over most of the altitude range up to 450 km. It is shown that an anomaly coefficient with a sharp peak of the order of 10,000 centered around the F2 peak is consistent with observations.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 83; Oct. 1
    Format: text
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  • 4
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    Observations of Birkeland currents at auroral latitudes (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: After many years of languishing interest, field-aligned currents (Birkeland currents) are now regarded as an important link between the magnetosphere and the ionosphere. We describe techniques that are used to measure them and then discuss in some detail measurements that have been interpreted as indicating the presence of Birkeland currents. We conclude that measurements substantiate the theory of large-scale flow from the magnetosphere to the polar caps in a dawn-dusk direction with opposite flow equatorward of the auroral zone connecting to the Alfven layer. Sheet current flow in premidnight discrete aurora seems experimentally established also, but its connection with auroral acceleration and with the larger-scale flow is not yet understood. The currents flowing during a substorm are not yet fully defined either.
    Keywords: GEOPHYSICS
    Type: Reviews of Geophysics and Space Physics; 13; Feb. 197
    Format: text
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