Observations of auroral substorms with meridian scanning photometer: Interpretations and implications

Details Observations of auroral substorms with meridian scanning photometer: Interpretations and implications Observations of auroral substorms with meridian scanning photometer: Interpretations and implications

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....13149m&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #13149

Computer Science

Scientific paper

Ground-based meridian scanning photometers are important tools in substorm research as they provide auroral photon emissions with very high temporal and spatial resolutions. The rapid poleward expansion of the auroras seen in MSP, for example, has been considered as one of the most reliable substorm onset indicators, even though its highly localized nature prevents from such a claim. In this study we argue that the usual way of identification of substorm onset based on the spatially limited MSP technique can be misleading. In support of our view, we compare MSP data with global auroral images acquired from the Polar ultraviolet imager for 10 isolated substorm events. These substorm events were selected becasue the MSP site was in the dusk-to-midnight sector, where more than 85% of substorms take place. Preliminary analysis of these events indicates that: (1) poleward expansion of the auroras observed by MSP tends to lag behind the auroral breakup observed by Polar UVI up to tens of minutes; (2) some so-called "pseudo-breakups" or "onset precursors" seen in MSP are actually associated with the true breakups taking place elsewhere; (3) the equatorward edge location of the oval correlates better with the z-component of the IMF than the substorm dynamics. These results certainly cast doubts in some previous substorm-related studies using MSP data. Detailed analysis results will be presented and implications will be discussed.

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