Solar millimetric bright sources on the quiet sun

Details Solar millimetric bright sources on the quiet sun Solar millimetric bright sources on the quiet sun

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204l.107b&link_type=abstract

Astrophysical Journal, vol. 204, Mar. 1, 1976, pt. 2, p. L107-L110.

Astronomy and Astrophysics

Astronomy

7

Millimeter Waves, Solar Activity, Solar Atmosphere, Solar Radio Emission, Brightness Temperature, Lower Atmosphere, Microwave Emission, Radio Sources (Astronomy)

Scientific paper

The radio emission of quiet regions has been investigated with high angular resolution at 35.1 GHz. The observations have shown the existence of bright and evolving sources all over the solar disk. By comparing the observations with a simple model, the following conclusions can be drawn: (1) these sources can be described as circular structures, the radius of which increases or decreases with a maximum diameter of 3 min; (2) the expansion, or regression, velocities are in the same range, 10-20 km/s, indicating a mean brightness temperature of about 30,000 K.

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