Observational evidence of the loading-unloading substorm scheme

Details Observational evidence of the loading-unloading substorm scheme Observational evidence of the loading-unloading substorm scheme

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3217107s&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 17, CiteID L17107

Physics

14

Magnetospheric Physics: Instruments And Techniques, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Polar Cap Phenomena, Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Magnetic Reconnection (7526, 7835)

Scientific paper

According to the loading-unloading substorm scenario, the magnetic flux, stored in the magnetotail during the substorm growth phase,is dissipated in the course of the expansion phase. However so far only separate estimates of both accumulated and dissipated flux values were made due to the lack of methods to calculate those quantities, doing their direct comparison impossible. First, we analyzed the magnetotail magnetic flux at substorm onset as a function of solar wind parameters to show that the tail magnetic flux, stored during the growth phase (ΔFT), depends mainly (CC = 0.95) on the merging electric field Em = VSWBtsin3$\theta$/2. It implies the lack of threshold magnetic flux at substorm onset. Also, the magnetic flux through the auroral bulge at substorm maximum (FB) was calculated from Polar UVI images. Comparison of ΔFT and FB shows their correlation and confirms their balance. These results quantitatively support the substorm model, based on reconnection mechanism.

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