Motion of near-Earth neutral line in substorm recovery phase

Details Motion of near-Earth neutral line in substorm recovery phase Motion of near-Earth neutral line in substorm recovery phase

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm11a1170n&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM11A-1170

Physics

2740 Magnetospheric Configuration And Dynamics, 2748 Magnetotail Boundary Layers, 2764 Plasma Sheet, 2788 Storms And Substorms

Scientific paper

A primary characteristic of the plasma sheet boundary layer(PSBL) is the presence of high speed field-aligned ion beams with abrupt low-speed cutoffs. Onsager et al.[\textit{JGR,96},20,999,1991] proposed a model of the formation of the PSBL which assumed a steady spatially extended source of plasma, together with steady equatorward ExB convection due to reconnection at a downtail neutral line. Elphic et al. [\textit{JGR,100},1857,1995] applied this model to ISEE 2 observations to estimate the downtail distance of the neutral line. The estimated locations were more than 65 RE downtail from the Earth, which seem to correspond to the distant neutral line(DNL). In this study, we estimated the distance of a near-Earth neutral line(NENL), which is inferred to be formed during substorms, by applying the velocity filter effect model of plasma sheet boundary layer(PSBL). The method was applied to counter-streaming ion beams observed by Geotail during the substorm event at 11:02 UT on Octorber 5, 2000. In the best case,we can estimate the downtail distance of the NENL with an accuracy of 10%. The estimated values range from 20 to 55 RE downtail, and increased with the total pressure decrease. This is consistent with previous statistical studies [\textit{Nagai et al.,JGR,101},4419,1998;\textit{Miyashita et al.,JGR,108},1353,2003]. In contrast to the past studies, however, our approach allows us to monitor the distance of the NENL continuously and to address its dynamics in the course of substorms.

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