MHD Simulation of Pi2 Cavity Mode Oscillations Observed by the CRRES Spacecraft

Details MHD Simulation of Pi2 Cavity Mode Oscillations Observed by the CRRES Spacecraft MHD Simulation of Pi2 Cavity Mode Oscillations Observed by the CRRES Spacecraft

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm32a18d&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM32A-18

Physics

2730 Magnetosphere--Inner, 2752 Mhd Waves And Instabilities, 2768 Plasmasphere, 7843 Numerical Simulation Studies

Scientific paper

On February 17, 1991, the CRRES spacecraft observed Pi2 oscillations at equatorial radius R ~ 6 and near midnight local time. During this time, the plasmasphere (or possibly a detached blob of plasma) had a maximum radial extent of R = 5.5 to 6.5, depending on the time of observation. When the spacecraft was within the enhanced density region, the Pi2 oscillations had poloidal and compressional polarization, had standing wave structure in the radial direction, and had a high correlation with ground magnetometer observations. When the spacecraft was outside the enhanced density region, the Pi2 oscillations had a mixture of toroidal and compressional polarization, had standing wave structure along the magnetic field, and had a low correlation with ground magnetometer observations. These observations suggest that the oscillations observed in the plasmasphere may result from a cavity mode, while the oscillations observed outside the plasmasphere may result mainly from a toroidal Alfvén mode. In order to test this hypothesis, we present the results of MHD simulations using density profiles determined from the CRRES observations and a dipole magnetic field.

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