Physics
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998angeo..16..283p&link_type=abstract
Annales Geophysicae, vol. 16, Issue 3, pp.283-291
Physics
4
Scientific paper
The flux asymmetries measured by spectrometers on board spacecraft contain information on particle parameters. The net flux intensity (NFI) method provides a tool to evaluate these parameters. The NFI method is valid when both the spin period of the spacecraft and the time resolution of the particle spectrometers are much shorter than the characteristic time-scale of the particle flux variations. We apply the NFI analysis to the flux asymmetry measurements made by GEOS 2 at the nightside geosynchronous orbit in the late substorm growth phase. The cross-tail current of energetic ions, their pressure gradient and average drift velocity, as well as a field-aligned flows are investigated. Current disruption at substorm onset and the convection surge mechanism during dipolarization of the magnetic field are directly observed.
Chen Zhao-Xu
Friedel Reiner H. W.
Korth Alex
Perraut Sylvaine
Pu Zu Yin
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