Viking magnetic and electric field observations of Pc 1 waves at high latitudes

Details Viking magnetic and electric field observations of Pc 1 waves at high latitudes Viking magnetic and electric field observations of Pc 1 waves at high latitudes

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.5941e&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 5941-5955. Research supported by the Swedish Board fo

Physics

73

Electric Fields, Geomagnetic Micropulsations, Ion Cyclotron Radiation, Magnetic Fields, Polar Regions, Viking Spacecraft, Magnetic Variations, Polarization (Waves), Wave Propagation

Scientific paper

Magnetic and electric field fluctuations in the Pc 1 frequency range (0.2-5 Hz) have been observed by the polar-orbiting Viking satellite. The fluctuations, interpreted here as electromagnetic ion cyclotron (EMIC) waves, were observed during 21 of 450 orbits surveyed between 0900 and 1400 MLT, near 3 R(E) geocentric altitude, and at invariant latitudes from 59 to 77 deg. The frequency structure of the waves is investigated, using spectral analysis and by determining the distribution of the wave frequency as a function of invariant latitude. At invariant latitudes from 59 to 72 deg, EMIC waves were observed in the frequency range below the equatorial He(+) gyrofrequency, while from 70 to 77 deg invariant latitude, EMIC waves were observed in the frequency range above the equatorial He(+) gyrofrequency. This latitude structure of the wave frequency is discussed in terms of the linear growth rate dependence of the waves on the heavy ion density, ion anisotropy, and ion energy. The propagation characteristics of these waves were also investigated, using minimum variance analysis and polarization analysis, and by estimating the Poynting flux based on the observed magnetic and electric field.

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