Large Swift Flow Variations at the Sunrise Topside Equatorial Ionosphere During a Storm

Details Large Swift Flow Variations at the Sunrise Topside Equatorial Ionosphere During a Storm Large Swift Flow Variations at the Sunrise Topside Equatorial Ionosphere During a Storm

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa21a..01s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA21A-01

Physics

2415 Equatorial Ionosphere, 2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics, 2481 Topside Ionosphere

Scientific paper

At the onset of the August 12, 2000 magnetic storm, ROCSAT-1 at 600 km altitude observed a continuous descent of the topside ionosphere to reach a minimum density of 500 ions/cm-3. The largest descending velocity was about 400 m/s which occurred at the density minimum and was followed by a rapid upward velocity reversal to 200 m/s. Accompanied by this swift vertical velocity reversal, the field-aligned flow also indicated a large inter-hemispheric flow reversal. The rapid density and flow variations occurred in a longitude span of 1100 km region at the dip equator. By removing the quiet-time density and flow background, we have constructed a storm-time density and flow variations across the dawn terminator. A flux-tube of excess positive charge apparently appeared temporarily at the onset of the storm above the ROCSAT orbit to cause the observed rapid flow changes as ROCSAT traversed under it. This flux-tube should be initially connected to the sub-auroral zone but was depressed closer to the Earth at the time when the topside ionosphere was descending and the excess charge began to appear due to the non-divergence of the zonal density flux. A positive bay which occurred in the auroral zone could be related to the equatorward movement of the sub-auroral flux tube and the whole auroral activity is caused by the impinging of an interplanetary magnetic sector boundary on the Earth magnetosphere.

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