Parallel structure of Pc1 ULF oscillations in multi-ion magnetospheric plasma at finite ion gyrofrequency

Details Parallel structure of Pc1 ULF oscillations in multi-ion magnetospheric plasma at finite ion gyrofrequency Parallel structure of Pc1 ULF oscillations in multi-ion magnetospheric plasma at finite ion gyrofrequency

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jastp..72.1327k&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 72, Issue 18, p. 1327-1332.

Physics

1

Scientific paper

The paper deals with the spatial structure of the Pc1 oscillations in multicomponent (protons and heavy ions) space plasma. As earlier studies (Guglielmi et al., 2000, 2001 and others) showed, an inhomogeneity along magnetic field and a finite ion gyrofrequency cause the formation in the equatorial region, a resonator which serves as a wave energy reservoir and determines the wave frequency. The present paper represents an extension of these ideas to the case of quasi-perpendicular wave propagation, k⊥≫k∥. It is shown that the resonator eigenfrequencies are very close to each other, which can result in formation of beating resembling the Pc1 pearl structure. On each side of the resonator there is an opaque region bounded by a parallel singular point, and a transparent region between this point and the ionosphere. At the parallel singular point the wave amplitude is finite. Compared to the case k⊥≪k∥ studied by Guglielmi et al., this resonator has a lower frequency and is a bit more narrow, and the near-ionospheric transparent region is wider, although on the order of the magnitude the parameters of the mode parallel structure in these two cases coincide.

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