Substorm onset timing via traveltime magnetoseismology

Details Substorm onset timing via traveltime magnetoseismology Substorm onset timing via traveltime magnetoseismology

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3608107c&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 8, CiteID L08107

Physics

3

Magnetospheric Physics: Substorms, Magnetospheric Physics: Instruments And Techniques, Magnetospheric Physics: Magnetotail, Seismology: General Or Miscellaneous

Scientific paper

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 RE 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.

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