Geosynchronous Response to Fast Plasma Flows in the Plasmasheet: Geotail-GOES Coordinated Observations

Details Geosynchronous Response to Fast Plasma Flows in the Plasmasheet: Geotail-GOES Coordinated Observations Geosynchronous Response to Fast Plasma Flows in the Plasmasheet: Geotail-GOES Coordinated Observations

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm21b..06y&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM21B-06

Physics

2708 Current Systems (2409), 2744 Magnetotail, 2764 Plasma Sheet, 2788 Storms And Substorms

Scientific paper

In this study we examine how geosynchronous magnetic configuration changes in response to the first plasma flow in the plasmasheet. One idea of the substorm trigger (the pile-up/braking model) proposes that the fast earthward flow in the plasmasheet, which is created by near-Earth reconnection, reduces the tail current intensity as the flow is decelerated and changes the plasma distribution and magnetic field configuration in the near-Earth region. Although occasional observations of subsequent occurrence of a fast plasmasheet flow and geosynchronous dipolarization are consistent with (but are not necessarily the proof of) this idea, the generality of such observations still remains to be understood. In fact, for a pseudobreakup event we examined previously [Ohtani, Yamaguchi et al., GRL, doi:10.1029/2001GL013785, 2002], one GOES satellite observed that geosynchronous magnetic field actually became more stretched after Geotail observed a fast flow in the plasmasheet, even though the two spacecraft were aligned in the X direction and were separated by only 4 RE. A preliminary study of similar Geotail-GOES coordinated observations suggests that such events are not uncommon. We will address how often and under what conditions geosynchronous magnetic field dipolarizes following the fast plasmasheet flow.

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