Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm51b0806p&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM51B-0806
Physics
2704 Auroral Phenomena (2407), 2764 Plasma Sheet, 2788 Storms And Substorms
Scientific paper
Measurements of thermal plasmas in the high-beta central plasma sheet near Earth acquired with the Comprehensive Plasma Instrumentation on board the Geotail spacecraft are studied for evidence of phenomena related to auroral dynamics. Images of the aurora from the Polar VIS Earth camera are used to guide this research. To place the plasma measurements in the context of the aurora, the ionospheric footprint of Geotail is determined with the aid of magnetic field models. These techniques have been used previously to study plasma dynamics near the plasma-sheet locus of substorm onset and to investigate the process of plasma-sheet injection in relationship with the expanding front of auroral luminosities following onset. In this presentation we discuss observations of plasmas and magnetic fields for a two-hour period on October 1, 1996 when Geotail was located within the high-beta plasma sheet near local midnight at a radial distance 14 RE from Earth. During this interval the VIS Earth camera records a sequence of small auroral activations near the Geotail footprint.
Frank Louis A.
Paterson William R.
Sigwarth John B.
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