Pi2 pulsations with second harmonic: CRRES observations in the plasmasphere

Details Pi2 pulsations with second harmonic: CRRES observations in the plasmasphere Pi2 pulsations with second harmonic: CRRES observations in the plasmasphere

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1242t&link_type=abstract

Journal of Geophysical Research Space Physics, Volume 108, Issue A6, pp. SMP 12-1, CiteID 1242, DOI 10.1029/2003JA009847

Physics

4

Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Electric Fields (2411), Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Magnetosphere-Inner

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 multifrequency Pi2 pulsations simultaneously observed from the Combined Release and Radiation Effects Satellite (CRRES) and at Kakioka (L = 1.26) can be explained by the cavity mode. The pulsations occurred in a 40-min time span on 20 January 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 (f 1, fundamental) and ~12 mHz (f 2, second harmonic). At CRRES, the f 1 oscillation was observed in the azimuthal component, E ϕ, of the electric field, while the f 2 oscillation was observed in the compressional component, B z, 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 E ϕ and B z 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 E ϕ and B z .

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