Features and Mechanisms of Substorm Onset and Expansion

Details Features and Mechanisms of Substorm Onset and Expansion Features and Mechanisms of Substorm Onset and Expansion

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm21a1881c&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM21A-1881

Physics

[2790] Magnetospheric Physics / Substorms

Scientific paper

We present key features of substorm observations by THEMIS satellites and high cadence optical observations by THEMIS All Sky Imagers and the Imager of Sprites and Upper Atmospheric Lightnings (ISUAL) aboard the FORMOSAT-2 satellite. In particular, we emphasize the fine structure in the onset arc and the associated magnetic fluctuations in Pi1 and Pi2 frequency ranges and their exponential growing behaviors before the onset of expansion phase. We will discuss the possible physical mechanism of substorm onset and the formation of onset arc. We will also present the nonlinear evolution of the onset arc breakup and magnetic fluctuations into turbulent states, the current disruption and magnetic field dipolarization processes and the dispersionless particle injection during the expansion phase.

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