The region occupied by the ULF compressional foreshock of a planetary shock depends on the IMF direction. As the cone angle of the IMF, the angle theta -XB between the solar ecliptic coordinate theta-XF X-axis and the field B, increases, the cone angle of the foreshock boundary, the angle theta-XF between the X-axis and the leading envelope of the foreshock, also increases. A statistical examination of the Venus and earth foreshocks shows that the trends of theta-XF of the two foreshocks are parallel, and quite similar under joint solar wind conditions. So are the local field-normal angles and return ion velocities at the bases of the respective foreshocks.
Comparative ULF foreshocks of earth and Venus observed by ISEE 1 and PVO
Advances in Space Research ; 6 , 1 19
1986-01-01
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Comparative ULF foreshocks of Earth and Venus observed by ISEE 1 and PVO
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