A Two-dimensional Magnetoseismic Network in the United States

Details A Two-dimensional Magnetoseismic Network in the United States A Two-dimensional Magnetoseismic Network in the United States

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa41b1728c&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA41B-1728

Physics

[2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2788] Magnetospheric Physics / Magnetic Storms And Substorms, [2794] Magnetospheric Physics / Instruments And Techniques, [7999] Space Weather / General Or Miscellaneous

Scientific paper

Supported through several projects a series of ground magnetometers deployed in the past few years have formed a two-dimensional magnetoseismic network in the United States. This network includes the nine-station Mid-continent MAgnetoseismic Chain (McMAC) along the 330th magnetic meridian and the Falcon chain spanning from Maryland to Alaska. Sampling at 2 Hz the high-resolution fluxgate magnetometers located at these ground stations detect magnetospheric perturbations in the ULF frequencies and transmit the data through the Internet for analysis. In this presentation we focus on the ULF wave activities, including the resonances of magnetospheric field lines and the impulsive signals, observed by this two-dimensional magnetoseismic network in conjunction with other magnetometer arrays in North America. In sounding the plasmaspheric density, the gradient method can make use of the two-dimensional array to identify field line resonance (FLR) signatures from station pairs that are not strictly aligned in the same meridian but are separated by up to 20 degrees in longitude. Using the observations from the two-dimensional magnetoseismic network we found the spatial variations of plasmaspheric density in local time that would otherwise be unidentifiable by only the data from a single meridian chain. In timing the substorm onsets in the magnetotail, the magnetometer network can measure the different arrival times of magnetic impulses induced by substorm onsets and infer the start time and location of the associated reconnection in the magnetotail. A future plan on enhancing the capability of this magnetoseismic network in space weather monitoring and the coordination with space missions will be discussed.

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