Temporal Variation of the Cross-tail Current During Near-Earth Dipolarization With Multi-Satellite Observations

Details Temporal Variation of the Cross-tail Current During Near-Earth Dipolarization With Multi-Satellite Observations Temporal Variation of the Cross-tail Current During Near-Earth Dipolarization With Multi-Satellite Observations

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm51b2085l&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM51B-2085

Physics

[2712] Magnetospheric Physics / Electric Fields, [2731] Magnetospheric Physics / Magnetosphere: Outer, [2744] Magnetospheric Physics / Magnetotail, [2788] Magnetospheric Physics / Magnetic Storms And Substorms

Scientific paper

Three near-Earth (|Xgsm| < 10 RE) dipolarization events were identified in which two THEMIS satellites were located at nearly identical equatorial projections but separated by the distance from the neutral sheet. In each of these events, one satellite was very close to the neutral sheet with |Bx| < 5 nT at dipolarization onset. The cross-tail current during dipolarization varied with a time scale of seconds and reduced by ~30-45% eventually. There was also the possibility of occasional breakdown of the frozen-in-field condition. The particle energization associated with dipolarization approached the satellite from the Earthward direction near the neutral sheet based on the ion sounding technique, constituting compelling evidence that these near-Earth dipolarization events arose from process originating in the near-Earth region (|Xgsm| < 10 RE) and were not due to magnetic flux pileup from mid-tail (|Xgsm| > 15 RE) disturbance.

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