Coronal bright points at 6 CM wavelength

Details Coronal bright points at 6 CM wavelength Coronal bright points at 6 CM wavelength

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..108...99f&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 108, no. 1, 1987, p. 99-111.

Physics

13

Brightness Temperature, Centimeter Waves, Solar Corona, Spatial Resolution, Very Large Array (Vla), Brightness Distribution, Magnetic Signatures, Spectroheliographs, Sunspots, X Rays

Scientific paper

The results of the first observations of solar coronal bright points at 6 cm wavelength using the Very Large Array (VLA), with a spatial resolution of about 1.2 arcsec, are reported. The maximum brightness temperature of the sources observed is about 30,000 K with a mean value of about 10,000 K (above the quiet sun value). The lifetime of most sources is between 5 and 20 min. The average diameter of the sources is about 5-15 arcsec. The sources are Gaussian-like near the footpoint of miniature loops and they appear in groups. The observations indicate that significant fluctuations in the brightness temperature (sometimes quasi-periodic) and in the spatial extents of these sources can occur over periods of a few minutes.

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