Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm51c0548t&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM51C-0548
Physics
2700 Magnetospheric Physics, 2730 Magnetosphere: Inner, 2752 Mhd Waves And Instabilities, 2768 Plasmasphere, 2788 Storms And Substorms
Scientific paper
Pi2 pulsations observed on the ground at low latitudes often exhibit multiple spectral peaks, and this property has been attributed to the harmonics of plasmaspheric cavity mode resonance. We show that multi-frequency Pi2 pulsations simultaneously observed from the Combined Release and Radiation Effects Satellite (CRRES) and at the Kakioka ground station (L = 1.26) can be explained by the cavity mode. The pulsations occurred in a 40-min time span on January 10, 1991. CRRES was within the plasmasphere at L = 6.1, on the dipole equator, and very near midnight. Kakioka was also very close to midnight. The pulsations consisted of two spectral components, ~7 mHz (f1, fundamental) and ~12 mHz (f2, second harmonic). At CRRES, the f1 oscillation was observed in the azimuthal component, Ey, of the electric field, while the f2 oscillation was observed in the compressional component, Bz, of the magnetic field. At Kakioka, by contrast, both the fundamental and second harmonic oscillations were detected in the horizontal component, H. The spectral separation between Ey and Bz implies that the spacecraft was located near the node/antinode of cavity mode resonance excited at multiple harmonics. Further support for this interpretation is provided from analyses of the phase of Ey and Bz.
Anderson Rachel
Hughes Jeffrey W.
Takahashi Keitaro
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