A Sunspot Monitoring Telescope with a high resolution CCD camera of 2000x2000 pixels was recently built at Hiraiso Solar Terrestrial Research Center, CRL. The telescope started its regular, daily observations in November 1996. We have obtained a good quality of the Sun's full disk images taken at 10 minutes cadence which contain a well-developed sunspot group. This NOAA active region 7999 was the largest sunspot group ever seen in the beginning of 23th solar cycle. The measured sunspot positions have been used to derive their proper motions. The image processing technique that has been applied for the purpose provides an accuracy of about 0.1 deg or less in the determination of Carrington longitude and latitude. The resulting sunspot motions are compared with the structures seen in H alpha, Soft X-ray and magnetogram data.
IAU Joint Discussion
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