Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm11b1585c&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM11B-1585
Physics
[2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2768] Magnetospheric Physics / Plasmasphere, [2788] Magnetospheric Physics / Magnetic Storms And Substorms, [2794] Magnetospheric Physics / Instruments And Techniques
Scientific paper
An important use of ground magnetometer observations in the 21st century is magnetoseismic research, which can be performed through two different methodologies. Normal-mode magnetoseismology uses the field line resonance (FLR) frequencies to calculate the plasma density in the magnetosphere. Travel-time magnetoseismology estimates the start time and location of impulsive events in the magnetosphere, such as sudden impulses and substorm onsets, by timing the arrival of impulse signals, and through the process the density structure of the magnetosphere can also be inferred. An existing magnetometer project for magnetoseismic research is the nine-station Mid-continent Magnetoseismic Chain (McMAC) that provides observations along 330° magnetic longitude in the U.S. and Mexico. The more recent Falcon magnetometer project further augments the FLR observations in the U.S. by setting up new stations spanning from Alaska to Maryland. Aided by the recent finding that FLR signatures can usually be identified when the east-west separation of the station pair is within 20° in longitude, the combination of McMAC and Falcon stations along with other magnetometers in North America can significantly enhance the longitudinal coverage of FLR measurements. The increase in magnetometer stations in the region can also benefit travel-time magnetoseismology in obtaining higher accuracy in the estimation from travel-time inversion. In this presentation we demonstrate the magnetoseismic observations made by McMAC and Falcon magnetometers, as well as how they can coordinate with other stations and form a 2-D magnetometer network in the U.S. The observations include the FLR sounding measurements that provide "quot;snapshots" of plasmaspheric densities and the travel-time analysis of sudden impulse and substorm events.
Bristow William A.
Chi Peter J.
Chun Francis K.
Engebretson Mark J.
Hairston Marc R.
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