VLA observations of solar active regions at 6 CM wavelength

Details VLA observations of solar active regions at 6 CM wavelength VLA observations of solar active regions at 6 CM wavelength

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....94...72k&link_type=abstract

Astronomy and Astrophysics, vol. 94, no. 1, Jan. 1981, p. 72-79.

Astronomy and Astrophysics

Astronomy

37

Centimeter Waves, Radio Astronomy, Solar Activity, Solar Magnetic Field, Solar Prominences, Solar Radio Emission, Bremsstrahlung, Cosmic Plasma, High Temperature Plasmas, Magnetic Field Configurations, Solar X-Rays, Sunspots, Thermal Radiation, Very Large Array (Vla)

Scientific paper

Synthesized maps of two solar active regions obtained from observations with the Very Large Array (VLA) with 9-arcsec resolution are presented. The most intense sources in these regions are found to be associated with filamentary structures and magnetic neutral lines as shown in H-alpha and photospheric magnetograms. These sources are not located directly over sunspots in disagreement with earlier observations. EUV and X-ray observations have suggested that similar structures should be visible at cm wavelengths around but, outside of, sunspots if the magnetic field is sufficiently strong. These results are consistent with the locations of hot (greater than 1,000,000 K) plasmas in active regions expected from generalization based on optical photographs. Given the sizes of the radio sources, the volume emission measures of soft X-rays observed from OSO-8 rule out the possibility of thermal bremsstrahlung being of any significance, as far as the 6 cm emission is concerned. Therefore, gyroresonance absorption process is the most likely cause of 6 cm emission from these sources, and its likelihood is enhanced by the magnetic field geometry that is known to exist over filaments and neutral lines.

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