Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm21a0457k&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM21A-0457
Physics
2730 Magnetosphere: Inner, 2731 Magnetosphere: Outer, 2753 Numerical Modeling, 2768 Plasmasphere
Scientific paper
Modern data analysis techniques allow the frequencies of standing shear Alfven waves (Alfven continuum) in the magnetosphere to be estimated almost routinely. These frequencies are primarily determined by two factors: the magnetic field intensity and density distribution along the length of geomagnetic magnetic field lines. We solve an eigenvalue problem to obtain the frequency of shear waves based on a general magnetic topology provided by the Tsyganenko magnetic field model and the global MHD model BATS- R-US. Together with the measured Alfven continuum frequencies, this technique is used to infer the magnetospheric plasma density over a range of local time. Our estimates are based on observations made under "typical" solar wind conditions when the empirical Tsyganenko model likely provides a good approximation for the magnetic field, as well as for extreme solar wind conditions (May 12, 1999, "the day Solar Wind disappeared") when global models may be expected to provide a more accurate representation of the magnetic field.
Dent Zoe C.
Kabin Konstantin
Mann Ian R.
Rankin Robert
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