The Relative Timing of Changes in the Inner Magnetospheric Magnetic Field and Plasma Configuration to Substorm Expansion Onset

Details The Relative Timing of Changes in the Inner Magnetospheric Magnetic Field and Plasma Configuration to Substorm Expansion Onset The Relative Timing of Changes in the Inner Magnetospheric Magnetic Field and Plasma Configuration to Substorm Expansion Onset

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm23b..02h&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SM23B-02

Physics

2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2768 Plasmasphere, 2784 Solar Wind/Magnetosphere Interactions, 2790 Substorms

Scientific paper

It is generally accepted that the synchronous magnetic field becomes more tail-like during the growth phase and more dipole-like during the expansion phase of magnetospheric substorms. The cause of this transition at expansion onset is still one of the central issues of substorm research. There are several models that attempt to explain the expansion onset. The near near-earth neutral line (NENL) model suggests that reconnection is the trigger of expansion onset. In this model, the plasma flows, caused by reconnection, brake in the near earth region, and thus cause flux pile-up. However, it has been claimed that the detection of a fast flow in the magnetotail is not always followed by ground substorm activity. Furthermore, a negative Bz spike (explosive growth phase) is frequently observed in the near-earth region just before the onset. It has been suggested that this feature implies that the flux pile up may not be the only factor responsible for the substorm expansion. In this study we examine a number of substorms from the THEMIS tail passages for which we have detailed information about the time history of activity. Detailed timing relationship between plasma flows, geosynchronous local onsets, Pi 2 pulsations at different locations will be examined as well as their occurrence frequency at substorm onsets. The understanding of the occurrence frequency and relative timing can help us understand the evolution of substorms.

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