Ground-based and satellite observations of substorm onset features

Details Ground-based and satellite observations of substorm onset features Ground-based and satellite observations of substorm onset features

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm41a1687c&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM41A-1687

Physics

[2704] Magnetospheric Physics / Auroral Phenomena, [2790] Magnetospheric Physics / Substorms

Scientific paper

We present the ground-based and satellite observations of substorm onset events. In the observations from Ground Based Observatories (GBO) and the ISUAL/FORMOSAT-2 satellite, we find structures which consist of periodic bright spots on the auroral arc prior to the substorm expansion phase onset. The intensity of arc grows exponentially before breakup with a linear growth rate of ~O(1-3)sec-1. Under the arc, the negative H-bay associated with the substorm is evident in the ground-based magnetometer data. From ISUAL observations, the first auroral brightening is identified roughly at the beginning of the negative H-bay. The auroral arc is breaks up before dispersionless particle injections are observed at geosynchronous orbit. Based on analysis of these observations, we suggest that this event can be a support of the scenario of substorm onset which is caused by a kinetic ballooning instability which is localized at ~ -10RE.

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