Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm51d..04f&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM51D-04
Physics
[2704] Magnetospheric Physics / Auroral Phenomena, [2744] Magnetospheric Physics / Magnetotail, [2764] Magnetospheric Physics / Plasma Sheet
Scientific paper
We present statistical analysis of the magnetospheric fast flow burst events and associated auroral signatures recorded by ground based all-sky imagers. THEMIS satellite data from December 2007 to March 2010 were analyzed covering three seasons when the satellite was positioned in the tail of the Earth's magnetosphere (from December to April). The main data was ion velocity records measured with the ESA instruments onboard THEMIS satellites. The primary condition for identifying the fast flow burst events was the value of the ion velocity GSM component exceeding a threshold value set at 200 km/s. The events were selected for further analysis when the satellite was positioned in the plasma sheet region and its north geomagnetic footprint was located in the field of view of any of the available ground-based stations. The position of the satellite inside the plasma sheet was estimated using the electron flux data measured with the ESA instruments and derived plasma characteristics. Altogether, 390 fast flow events were identified. Majority of the events were observed during January, February, and March of 2008 and 2009. The burst events were typically observed at one satellite only. The durations of the burst events typically did not exceed half an hour, however, several cases of "clusters" of bursts were recorded and were analyzed separately. There were 142 burst events for which the PBI or streamer signatures were recorded at the all-sky imagers, located near the corresponding satellite geomagnetic footprint. Most of the PBI events were observed near the local midnight. The shapes and characteristics of the auroral signatures observed during the burst events vary dramatically depending on the MLT and auroral signature location. We attempt to make a classification of the observed PBI/streamer events and relate them to the characteristics of the magnetospheric environment during each event. Several most interesting events are analyzed in greater details.
Foley Carl
Paznukhov V. V.
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