Magnetospheric observation of large sub-auroral electric fields

Details Magnetospheric observation of large sub-auroral electric fields Magnetospheric observation of large sub-auroral electric fields

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..881m&link_type=abstract

Geophysical Research Letters, vol. 7, Nov. 1980, p. 881-884.

Physics

9

Atmospheric Electricity, Electric Fields, Ion Motion, Magnetospheric Instability, Atmospheric Models, International Sun Earth Explorer 1, Latitude, Polar Substorms, Time Response

Scientific paper

An example of large subauroral poleward electric fields similar to those observed on OGO-6, S3-2 and AE-C (SAID) has been found in the magnetosphere near L = 4 and 2300 MLT using ISEE-1 electric field data. The event is located adjacent to and outside the plasmapause and occurs 1 1/2 hours into a substorm. The event is accompaned by a significant penetration of the convection electric field inside the plasmasphere. Data from similar regions on the next orbit occurring near the beginning of a substorm did not exhibit these effects. Recent theoretical models predict SAID to occur in the trough regions, where substorm dynamics force currents to flow in regions of low conductivity. These models provide a first-order interpretation of this phenomena; however, the overal picture is more complex.

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