Is a Substorm Expansion Required to Initiate a Steady Magnetospheric Convection Event?

Details Is a Substorm Expansion Required to Initiate a Steady Magnetospheric Convection Event? Is a Substorm Expansion Required to Initiate a Steady Magnetospheric Convection Event?

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm51b2092k&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM51B-2092

Physics

[2704] Magnetospheric Physics / Auroral Phenomena, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2760] Magnetospheric Physics / Plasma Convection, [2790] Magnetospheric Physics / Substorms

Scientific paper

Steady magnetospheric convection (SMC) events are periods longer than a typical substorm recovery phase of enhanced convection with an absence of substorm onsets. The prevailing theory for their occurrence is a balance of reconnection rates at the dayside and nightside x-lines. Previous statistical studies used superposed epoch analysis of auroral indices to show there is typically a decrease in AL prior to the start of SMCs, indicating that a preceding substorm may be necessary to initiate balanced reconnection. However, several cases have been published in which there is no evident substorm auroral onset before a long period of steady magnetospheric convection. Using a list of nearly 3000 SMC intervals from 1997 to 2009, we determine the percentage of events that do not have a clear AL onset prior to the start. Multiple datasets for this subset are closely examined for other onset signatures. We present several case studies of SMC without a preceding substorm using the THEMIS spacecraft and All-Sky Imagers, and determine whether these special cases differ from the majority of SMCs.

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