Substorm onset timing via traveltime magnetoseismology

P. J. Chi, C. T. Russell, S. Ohtani

doi:10.1029/2008gl036574

Substorm onset timing via traveltime magnetoseismology

DOI Web Site Web Site 被引用文献4件

P. J. Chi

Institute of Geophysics and Planetary Physics University of California Los Angeles California USA
C. T. Russell

Institute of Geophysics and Planetary Physics University of California Los Angeles California USA
S. Ohtani

Johns Hopkins University Applied Physics Laboratory Laurel Maryland USA

書誌事項

公開日: 2009-04

権利情報

http://onlinelibrary.wiley.com/termsAndConditions#vor

DOI

10.1029/2008gl036574

公開者: American Geophysical Union (AGU)

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説明

<jats:p>This letter introduces a traveltime magnetoseismic technique that can estimate the substorm onset time in the magnetotail from multi‐point observations of Pi 2 pulsations. The arrival time of Pi 2, which is defined as the first peak in Pi 2 amplitude, observed by ground magnetometers presents a strong function of latitude. Using the Tamao traveltime as the forward model, the magnetoseismic inversion from the observed Pi 2 arrival time infers that the onset of the 22 July 1998 substorm in the magnetotail started at X ∼ −20 R<jats:sub>E</jats:sub> at 6:53:10 UT, or 1–3 minutes earlier than the Pi 2 onset time conventionally identified in ground records. The magnetoseismic result is further compared with the observations of auroral brightening, revealing a clear sequence of events during this substorm.</jats:p>