Proper motions of solar type-I sources

Details Proper motions of solar type-I sources Proper motions of solar type-I sources

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986acaps...6..240l&link_type=abstract

(Acta Astrophysica Sinica, vol. 6, 1986, p. 240-248) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 10, Dec. 1986, p.

Astronomy and Astrophysics

Astrophysics

Decimeter Waves, Interferometry, Radiation Distribution, Solar Corona, Solar Magnetic Field, Solar Radio Bursts, Instrument Errors, Photosphere, Radio Tracking, Stellar Models, Sunspots

Scientific paper

Radio tracking of the sun over 6 hrs around transit was made by the Miyun 460 MHz compound interferometer to determine the two-dimensional positions of Type-I sources and their proper motions. The measuring error in relative position was less than 0.1 arcmin. Most of Type-I sources show slow motions at times. The speed ranges from the interferometer threshold of 0.2 arcmin to arcmin/hr 2 arcmin/hr /2.4(+6) cm/s/. The largest proper motion found was 5 arcmin in 6 hrs, but the usual amplitudes were 1-2 arcmin in 6 hrs. Active regions with moving Type-I sources show more flare activity, i.e. more flares of importance class 1 or greater within a three day period around the day when the source shows motion, while other regions are not so active. The proper motion is sometimes related to phospheric phenomena. It is believed that the proper motion of a Type-1 source is a reflection of the changing configuration of the coronal magnetic field above the active region and this variation could be related to flare activity.

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