Meridional flow and rotation of active regions |
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| Authors: | R W Komm |
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| Institution: | (1) National Solar Observatory, National Optical Astronomy Observatories, 85726 Tucson, AZ, USA |
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| Abstract: | Meridional flow and rotation are studied using high-resolution magnetograms taken during the year 1988 with the NSO Vacuum Telescope on Kitt Peak. Motions are determined by a two-dimensional crosscorrelation analysis of 107 pairs of consecutive daily observations. The analysis was done first with active regions included and repeated with active regions excluded. The difference between the two analyses provides an estimate of the motions of active regions. I find that active regions rotate slower than small magnetic features and that active regions show a meridional flow toward the mean latitude of activity.Operated by the Association of Universities for Research in Astronomy, Inc. under cooperative agreement with the National Science Foundation. |
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