Investigation of triggering mechanism of substorm through the analysis of Geotail and Themis data

Details Investigation of triggering mechanism of substorm through the analysis of Geotail and Themis data Investigation of triggering mechanism of substorm through the analysis of Geotail and Themis data

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm54a..06m&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM54A-06

Physics

[2723] Magnetospheric Physics / Magnetic Reconnection, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2744] Magnetospheric Physics / Magnetotail, [2790] Magnetospheric Physics / Substorms

Scientific paper

In our previous study, we have adopted a superposed epoch analysis method to the Geotail data to understand the triggering mechanism of substorm. Further, we have proposed a new scheme of substorm called "Catapult Current Sheet Relaxation Model" to explain our results. As an extension of these works, we adopted the same method of analysis to the Themis spacecraft data, and found that there are both the same and different characteristics between the results of Themis and Geotail. It is of interest that clear differences are present even if we use the same data set of Themis but adopting different lists of auroral breakups, i.e., substorm onsets. These differences seem to be attributed to the intensity of substorm. Large substorms tend to have southward magnetic field variations related to the plasma sheet thinning which is known as a notable characteristic during a growth phase, near the Earth compared to small substorms. However, the convective earthward flows are weakened just for a few minutes prior to the onset, followed by notable enhancement of the earthward flows after the onset. On the other hand, the southward variations in the magnetic field for small substorms can be seen in the tailward side compared to large substorms. While, the northward magnetic field variations after the onset can be also seen in the tailward side. Furthermore, the earthward convective flows which are not produced by magnetic reconnection seem to develop for moderate class of substorms just prior to the onset. Those differences can be a crucial clue to solve the issue of substorm triggering.

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