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Estimated wave speeds in coronal holes and streamers.
S. T. Suess
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Abstract
In this paper, characteristic wave speeds in the solar corona are made based on published models of a coronal hole and streamer. It is found that the Alfven speed varies from over 4000 km/s at the center of the coronal hole at 2.0 solar radii down to about 100 km/s in the center of the streamer at 5.0 solar radii. Taking into account the bias in the streamer model, a more realistic estimate of the minimum Alfven speed is 800 km/s at the same location. The sound speed lies between 100 and 200 km/s everywhere between 2.0 and 5.0 solar radii while the flow speed is generally less than the sound speed at 2.0 solar radii and greater than the sound speed at 5.0 solar radii.