Statistics – Methodology
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm12a..04c&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SM12A-04
Statistics
Methodology
1594 Instruments And Techniques, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2784 Solar Wind/Magnetosphere Interactions, 2790 Substorms, 2794 Instruments And Techniques
Scientific paper
Travel-time magnetoseismic analysis [Chi and Russell, Geophys. Res. Lett., 32, L18108, 2005] is one of the best examples of heliophysical studies that benefit from simultanenous observations by a network of ground magnetometer arrays. Focusing on the impulses starting from a localized region in the magnetosphere, the travel-time method times the first amplitude peak in magnetic field records, which is associated with the so-called Tamao travel time from the source. The source location, the impulse's start time, and the profile of MHD speeds in the modeled region are then estimated through a data-model fit in a way similar to the practice of terrestrial seismology. Using the observations by magnetometer arrays in North America, we demonstrate how the travel-time method uses sudden impulse signals to estimate the distribution of plasma mass density in the dayside magnetosphere, and we also show how it uses the Pi~2 pulsations to pinpoint the start time and location of substorm onsets in the magnetotail. The available spacecraft observations for the events examined are consistent with the magnetoseismic results, providing support to this new methodology. We conclude by presenting the ongoing investigation on substorm triggering that incorporates the substorm onset time in the magnetotail inferred by the travel-time method and the observations of auroral intensification by satellite or ground-based imagers.
Chi Peter J.
Ohtani Shin
Russell Christopher T.
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