Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm41a1840l&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM41A-1840
Physics
[2712] Magnetospheric Physics / Electric Fields, [2723] Magnetospheric Physics / Magnetic Reconnection, [2744] Magnetospheric Physics / Magnetotail, [2790] Magnetospheric Physics / Substorms
Scientific paper
The cumulative magnetic flux transport Earthward/tailward of the reconnection site in the plasma sheet or equatorward towards the neutral sheet (Φ) has been shown to be one of the most useful quantities for remotely sensing reconnection onset in the magnetotail. We examine the behavior of Φ during substorms near the onset meridian using superposed epoch analysis of THEMIS observations at different downtail distances. We use the THEMIS Substorm Database, assembled under the auspices of the GEM program (http://www.igpp.ucla.edu/themis/events/). We find that Φ starts to increase a few minutes prior to ground mid-latitude Pi2 onset. Although our study cannot monitor regions beyond 30 RE, the apogee of the most distant probe, P1, there is a tendency for the enhanced transport to start first at 20-30 RE and move progressively inward just prior to ground Pi2 onset. Our results are consistent with recent THEMIS case studies showing that reconnection initiates the substorm expansion phase process.
Angelopoulos Vassilis
Bonnell J. W.
Frissell N. A.
Gabrielse C. E.
Glassmeier K.-
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