Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm41c..02b&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM41C-02
Physics
2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2760 Plasma Convection (2463), 2790 Substorms
Scientific paper
The precession of the Polar spacecraft orbit has placed its apogee (~9 Re) near the equator during 2000- 2003, allowing correlative studies of electric fields and plasmas between Polar and the satellites of the Cluster constellation (apogee ~19 Re). This has allowed us to preview the sorts of radial and azimuthal alignments planned for the inner satellites of the THEMIS mission, and to better understand the relationships between the in-situ plasma and field measurements and the ground-based signatures of substorm onset. A particularly clear example of correlated, rapid, and large-amplitude electric field fluctuations associated with strong plasma flows and ground signatures of substorm onset was observed on Polar and Cluster on 20 September 2003. This particular event has features that suggest important macro- and micro-scale ramifications of the electromagnetic fluctuations associated with substorm onset in the tail. The onset of electromagnetic fluctuations and strong flows at both Polar and Cluster are close to simultaneous, indicating a onset occurring between the two spacecraft, near 13 Re downtail. Ion flows as measured by Cluster/CIS are a few hundred km/s in magnitude in a relatively high-temperature environment (~14 keV). ExB flows derived from both Polar EFI and Cluster EFW indicate much higher speed flows (several thousand km/s), consistent with the observed time delays between Polar and Cluster (The discrepancy between the CIS flows and ExB flows arise primarily from instrumental background effects in the CIS data). Significant cross-tail flows at both Polar and Cluster suggest flow diversions even over the relatively short streamlines between the onset site and the spacecraft positions.
Bonnell J. W.
Lin Nan
Mozer Forrest S.
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