Analysis of stabilities of the spiral sector transition region in the interplanetary magnetic fields

Details Analysis of stabilities of the spiral sector transition region in the interplanetary magnetic fields Analysis of stabilities of the spiral sector transition region in the interplanetary magnetic fields

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984chjss...4..261w&link_type=abstract

Chinese Journal of Space Science, vol. 4, Oct. 1984, p. 261-268. In Chinese, with abstract in English.

Astronomy and Astrophysics

Astronomy

Astronomical Models, Interplanetary Magnetic Fields, Magnetic Field Configurations, Magnetopause, Magnetospheric Instability, Wave Propagation, Solar Wind Velocity

Scientific paper

The stabilities of the ME-type spiral sector transition region in the interplanetary magnetic fields is studied using a four-layer model. The results show that three kinds of large-scale waves may be excited in ME-type transition regions, and a low-frequency cut-off exists for all of them. The growth rates of these three kinds of instabilities all increase as k increases, but the growth rate of only one model has a maximum and a minimum. When vector k is parallel or antiparallel to the velocity of the solar wind in the sector regions, the excitation of waves is easier. As the angle between the vectors becomes larger, the cut-off wavelength moves to the shot end, but when it is perpendicular the waves cannot be excited. When the angle between the vectors is 75 deg, the wave with wavelength 50,000 km and phase velocity 340 km/s may be excited, in agreement with observations at the earth's magnetopause obtained from Voyager 1.

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