A mechanism for the loading-unloading substorm cycle missing in MHD global magnetospheric simulation models

Details A mechanism for the loading-unloading substorm cycle missing in MHD global magnetospheric simulation models A mechanism for the loading-unloading substorm cycle missing in MHD global magnetospheric simulation models

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3214108k&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 14, CiteID L14108

Physics

5

Magnetospheric Physics: Magnetic Reconnection (7526, 7835), Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Substorms

Scientific paper

A 2-dimensional numerical driven current-sheet model has been developed that incorporates an idealized current-driven instability with a resistive MHD system. Under steady loading, the model exhibits a global loading-unloading cycle. The specific mechanism for producing the loading-unloading cycle is discussed. It is shown that scale-free avalanching of electromagnetic energy through the model, from loading to unloading, is carried by repetitive bursts of localized reconnection. Each burst leads, somewhat later, to a field configuration that is capable of exciting a reconnection burst again. This process repeats itself in an intermittent manner while the total field energy in the system falls. The total field energy is reduced to well below that necessary to initiate an unloading event and, thus, a loading-unloading cycle results. It is shown that, in this model, it is the topology of bursty localized reconnection that is responsible for the appearance of the loading-unloading cycle.

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