Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm51c..03a&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM51C-03
Physics
2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2764 Plasma Sheet, 2790 Substorms
Scientific paper
We report on simultaneous magnetotail measurements by THEMIS at multiple distances, at the time of substorm onset, which occured on Feb 26, 2008. Evidence for reconnection including bipolar magnetic field, inflow towards the neutral sheet and counterstreaming electrons was observed at P1 and P2, suggesting that the reconnection site was at 20 Re. Evidence for current disruption, including dipolarization, turbulence and plasma heating were observed at P3 and P4 at ~11Re. Remote sensing of the current disruption region onset was not possible but particle distributions suggest that the plasma had started moving Earthward ahead of the dipolarization, i.e., point towards a source tailward of the P3, P4 satellites. Auroral brightening and poleward expansion was observed after reconnection onset and before dipolarization onset, suggesting that this event was triggered by reconnection around 20Re. Observations from a number of similar events show that a consistent picture of onset is starting to emerge from the first tail season. We discuss implications for substorm models and for auroral particle acceleration.
Angelopoulos Vassilis
Auster Uli
Carlson Carl
Donovan Eric
Frey Harald
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