Wave properties near the subsolar magnetopause - Pc 1 waves in the sheath transition layer

Details Wave properties near the subsolar magnetopause - Pc 1 waves in the sheath transition layer Wave properties near the subsolar magnetopause - Pc 1 waves in the sheath transition layer

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.5907s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A4, p. 5907-5923.

Physics

30

Geomagnetic Micropulsations, International Sun Earth Explorers, Interplanetary Magnetic Fields, Ion Temperature, Magnetopause, Polarization (Waves), Satellite Observation, Nyquist Frequencies, Power Spectra

Scientific paper

We study the waves in the frequency range of Pc 1 in the sheath transition layer of the magnetopause from the ISEE 1 and 2 observations. The waves are enhanced in the sheath transition layer, although they are scattered into the magnetosheath when the outer edge of the sheath transition layer is not sharp. The wave frequency is proportional to, and equal to, about 44 percent of the ion gyrofrequency. The waves are left-handed polarized for southward IMF, but linearly polarized for northward IMF. The direction of maximum variation is perpendicular to both the background field and the gradients of the field and density for northward IMF; for southward IMF, the waves are more turbulent. Wave generation mechanisms may depend on IMF orientations rather than the shock geometry. To investigate the free energy generating the waves for northward IMF, a method is developed combining the measurements from the fast plasma experiment and Lepedea to obtain a high time resolution estimate of the temperature anisotropy for strongly northward IMF. The estimated ion temperature anisotropy is enhanced, up to a factor of 2, within the sheath transition layer for northward IMF.

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