Statistical Relation between Mid-latitude Positive Bays and Other Substorm Onset Signatures

Details Statistical Relation between Mid-latitude Positive Bays and Other Substorm Onset Signatures Statistical Relation between Mid-latitude Positive Bays and Other Substorm Onset Signatures

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm51b2074c&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM51B-2074

Physics

[2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [2790] Magnetospheric Physics / Substorms

Scientific paper

Magnetospheric substorm plays a key role in the coupling of the solar wind and the magnetosphere. A sudden intensification of aurora which moves poleward and westward is usually identified as the indicator of substorm onset. High-latitude negative bay and mid-latitude positive bay (MPB) usually accompany the auroral brightening. Furthermore, dipolarization in geosynchronous orbit and dispersionless injection are usually observed during a substorm. It is believed that these phenomena are highly correlated and they are manifestations of the formation of the Substorm Current Wedge (SCW) at substorm onsets. A large statistical study of the correlation among these phenomena has not been reported previously. In this study, a database of substorm onsets is determined by AL indices, MPB observed by INTERMAGNET, auroral observation by IMAGE and All Sky Images (ASI) from the THEMIS ground network, geosynchronous dipolarization by GOES, dispersionless injection by LANL and tail dipolarization by THEMIS. Time-delay and occurrence frequency analysis between these different onset lists shows that these phenomena are not always correlated in a one-to-one manner. Approximately 65% of MPB onsets are found to be associated with AL onsets and the association rates are similar between MPB onsets and other substorm onset signatures. Further work is necessary to clarify why this is the case for different kinds of onsets. The solar wind driving condition and the response function of magnetosphere is also studied for different categories of events.

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