Variation of Alfven fluctuations across a slow shock near the sun |
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| Authors: | Feng-si Wei Chuan-yi Tu |
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| Institution: | Institute of Space Physics, Academia Sinica China;Department of Geophysics, Beijing University China |
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| Abstract: | We consider how the Alfven fluctuation varies as it passes through a slow MHD shock, assuming the fluctuation to originate on the Sun and such slow shocks are present between 2 and 6 solar radii. The results are 1) low latitude region in the vicinity of the neutral sheet is where the fluctuation can propagate with no or little distortion; 2) high latitude region far from the neutral sheet is a region of small distortion only for low Alfven-Mach numbers (about 0.3 or lower); 3) the observation of the Alfven fluctuations in space is consistent with, and lends support to their originating in the Sun and the existence of slow shock around the Sun. |
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