A stability analysis of the spiral sector transition region in the interplanetary magnetic field

Details A stability analysis of the spiral sector transition region in the interplanetary magnetic field A stability analysis of the spiral sector transition region in the interplanetary magnetic field

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985chjss...4..261w&link_type=abstract

(Chinese Journal of Space Sciences, vol. 4, 1984, p. 261-268) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 9, March

Astronomy and Astrophysics

Astrophysics

Interplanetary Magnetic Fields, Kelvin-Helmholtz Instability, Solar Terrestrial Interactions, Magnetopause, Wave Dispersion, Wave Excitation

Scientific paper

A four-layer model is used in a stability analysis of the ME-type spiral-sector transition in the interplanetary magnetic field. The results show that three kinds of large-scale waves may be excited in the region, and for all three there exists a low-frequency cut-off. In all three, the rate of growth of instability increases with k; in Model A only, the rate of growth has a maximum and a minimum. As the angle between k and the solar-wind velocity vector Vq increases, the cut-off frequency increases, and the excitation of waves gets more and more difficult until it becomes impossible when k is perpendicular to Vq. When the angle between k and Vq is 75 deg, waves with a wavelength 50,000 and a phase velocity of 340 km/s may be excited; this agrees with the observations by Voyager 1 at the earth's magnetopause. Hence waves in the spiral-sector transition region may be a source that triggers off the Kelvin-Helmholtz instability of the magnetopause.

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