Evidence for Co-existence of Outside-in and Inside-out Scenarios in Substorm on January 9, 2008

Details Evidence for Co-existence of Outside-in and Inside-out Scenarios in Substorm on January 9, 2008 Evidence for Co-existence of Outside-in and Inside-out Scenarios in Substorm on January 9, 2008

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm51c..07c&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM51C-07

Physics

2704 Auroral Phenomena (2407), 2721 Field-Aligned Currents And Current Systems (2409), 2744 Magnetotail, 2790 Substorms

Scientific paper

In the previous and recent studies (Pu et al., 1999, 2001; Cao et al., 2008; Zhang et al., 2007) we have suggested the co-existence of outside-in and inside-out scenarios in fully developed substorms. In the present work we show further evidence for this picture from THEMIS, Polar and ground-based measurements of an isolated substorm on January 9, 2008. During the growth phase of the substorm, THEMIS P2 (located at (-23.3, -5.0, -8.4) Re in GSM) observes an earthward flow at ~0640UT, indicating the occurrence of reconnection in the mid-tail. At 0654:30UT, an earthward flow arrives at P4 ((-9.7, -4.2, -3.7) Re) and causes magnetic flux pileup. Meantime, at 0654:54 and 0656:21UT PGEO station and Polar UVI imager observe pre- midnight auroral activity around MLAT 62oand MLAT 65o, respectively. Later at 0657 and 0702UT P4 sees depolarization twice, during which Pi2 reaches maximum, Pi1 greatly enhances, plasma temperature rapidly increases and the ideal MHD condition is broken. Besides, P5 ((-7.2, 0.0, -2.4) Re), GOES12 ((-5.3, -3.6, - 1.8) Re) and GOES11 ((-5.5, 2.8, -2.6) Re) observe depolarization, respectively, at 0706, 0711 and 0716UT. Of particular interest are substorm activations after 0722UT when IMF at 1 AU starts northward turning. Rightafter 0722UT Polar UVI shows a major onset of aurora breakup; at 0722UT P3 and P4 observe depolarization/current disruption. Then at 0728 and 0732UT P5 and P2 also see this feature at ~7Re and 17 Re, respectively. Later substorm expansion arrives at GOES11 and P1 at 0738 and 0750UT, successively. Poleward expansion of auroral bulges and tailward progression of substorm expansion are shown to be closely related. This event displays the development of a fully developed substorm£ºMagnetic reconnection first occurs in the mid-tail and earthward flows cause flux pileup/dipolarization in the near-Earth tail; the substorm expansion then progresses tailward, earthward and westward/eastward, leading to the full development of substorm expansion phase. Underlying dynamical processes are briefly discussed.

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