Near-Earth dipolarization: Evidence for a non-MHD process

Details Near-Earth dipolarization: Evidence for a non-MHD process Near-Earth dipolarization: Evidence for a non-MHD process

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2905l&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 19, p. 2905-2908

Physics

Plasma Physics

26

Space Plasma Physics: Transport Processes, Space Plasma Physics: Turbulence, Space Plasma Physics: Kinetic And Mhd Theory, Space Plasma Physics: Nonlinear Phenomena

Scientific paper

We have investigated a near-Earth depolarization event in the midnight sector using simultaneous observations of Polar and Geotail. We have found evidence for near-Earth depolarization to be a non-MHD process: depolarization occurring without significant plasma flow or with tailward flow and during dawnward electric field different from that inferred based on the frozen-in condition. These observations are inconsistent with the idea that depolarization is an MHD process of magnetic flux pileup from braking of sunward plasma flow. Possible variances of the flow braking scenario are considered but none is satisfactory in accounting for the observed features. On the other hand, these findings are quite consistent with the expectations from the current disruption scenario.

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