Statistical relation of substorm onset to auroral onset, mid-latitude positive bay onset and geosynchronous dipolarization

Details Statistical relation of substorm onset to auroral onset, mid-latitude positive bay onset and geosynchronous dipolarization Statistical relation of substorm onset to auroral onset, mid-latitude positive bay onset and geosynchronous dipolarization

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm43a1902c&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM43A-1902

Physics

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

Scientific paper

Substorms play a key role in the coupling of the solar wind and the magnetosphere. A sudden increase of auroral intensity which moves poleward is usually identified as the indicator of substorm onset. Another fundamental observational signature of substorms is geomagnetic disturbance. Rapid geomagnetic disturbances usually accompany the auroral brightening. At higher latitude, the magnetic disturbance exhibits an abrupt negative change called the negative bay onset. At mid-latitude, the change of geomagnetic disturbance is usually positive and is called mid-latitude positive bay onset. Furthermore, an increase of magnetic inclineation angle at geosynchronous orbit near mid-night sector which is call dipolarization is usually observed during a substorm. It is believed that all these phenomena are highly correlated with substorm and they are manifestations of the formation of a substorm current wedge at substorm onset. However, a large statistical study of the correlation among all these phenomena has not been previously reported. In this study, we will build a database of substorm onsets which is determined by AL indices. In addition, a substorm onset list which is determined by auroral observations from IMAGE will be established. Furthermore, lists of the onsets of mid-latitude positive bays and geosynchronous dipolarization will be created. We will examine the time delay and occurrence frequency among these various measures of onset to see how closely related each is related to the AL and auroral onsets. The AL indices in 2004, auroral observations from IMAGE, more than 15 ground stations from InterMagnet chain, and GOES 10 and 12 data will be used in this study. A preliminary result shows that these phenomena are not always correlated in a one-to-one manner and a further investigation is necessary to clarify why this is the case.

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