Mass Density at Geosynchronous Orbit Inferred From Toroidal Alfven Frequencies

Details Mass Density at Geosynchronous Orbit Inferred From Toroidal Alfven Frequencies Mass Density at Geosynchronous Orbit Inferred From Toroidal Alfven Frequencies

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm33a1101d&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM33A-1101

Physics

2730 Magnetosphere: Inner, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2768 Plasmasphere, 2794 Instruments And Techniques

Scientific paper

Frequencies of the toroidal Alfven field line resonance mode can be used to infer magnetospheric mass density, a technique sometimes referred to as magnetoseismology. Geosynchronous orbit is an ideal location for this technique since a geosynchronous spacecraft approximately corotates with the plasma leading to a relatively stationary wave signal for Fourier analysis. Here we present results from magnetoseismology, with special emphasis on results at geosynchronous orbit. These include a solar cycle dependence with mass density higher at solar maximum, increased mass density with geomagnetic activity, a local time dependence with density higher in the afternoon local time sector, and a field line dependence which is relatively flat along the field line at morning local time, but peaked at the magnetic equator at afternoon local time, especially during geomagnetically active times.

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