Physics
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...105..227g&link_type=abstract
Journal of Geophysical Research, Volume 105, Issue A1, p. 227-236
Physics
8
Ionosphere: Auroral Ionosphere, Ionosphere: Modeling And Forecasting, Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Storms And Substorms
Scientific paper
Calculations of height-integrated conductivity from 31 individual Dynamics Explorer (DE 2) substorm crossing presented by Gjerloev and Hoffman [this issue] are used to compile empirical models of the height-integrated Pedersen and Hall conductivities (conductances) in a bulge-type auroral substorm. Global auroral images obtained by Dynamics Explorer 1 (DE 1) were used to select substorms displaying a typical bulge-type emission pattern and each individual DE 2 pass was positioned with respect to key features in the observed emission pattern. The conductances were calculated for each DE 2 pass using electron precipitation data and a monoenergetic conductance model. All passes were divided into six different sectors, and average conductance profiles were carefully deduced for each of these sectors. Using a simple boxcar filter, smoothed average sector passes were calculated and from linear interpolation between these, two-dimensional conductance models were compiled. The characteristics of our models are (1) the Hall conductance maximizes in the high-latitude part of the surge at 48 mho with a Hall to Pedersen ratio of 2.4; (2) two channels of enhanced conductance are overlapping in local time near midnight and are fairly separated in latitude; (3) the conductance has a sharp gradient at the high-latitude boundary in the premidnight sector while in the postmidnight sector a broad region of low conductance stretches up to 10° invariant latitude poleward of the local peak; and finally, (4) the enhanced conductance region displays a characteristic broadening toward dawn primarily owing to a poleward shift of the high-latitude boundary.
Gjerloev Jesper W.
Hoffman Robert A.
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