Multiple wavelength observations of a solar active region

Details Multiple wavelength observations of a solar active region Multiple wavelength observations of a solar active region

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...80...71c&link_type=abstract

Solar Physics, vol. 80, Sept. 1982, p. 71-85. Research supported by the Consiglio Nazionale delle Ricerche

Physics

36

Faculae, Multispectral Photography, Solar Activity, Solar Radiation, Sunspots, Bremsstrahlung, Brightness Temperature, Carbon, H Alpha Line, Solar X-Rays

Scientific paper

The active region AR 2490 was observed on two consecutive days at soft X-ray, ultraviolet, optical, and radio wavelengths (2, 6, and 20 cm), with comparable angular resolution and field of view. The observations of the radio emissions at 6 and 20 cm wavelengths show a double structure in which one component is associated with bright H(alpha) plage, C IV, and soft X-ray emission, and the other component is associated only with sunspots, and no radiation at 2 cm wavelength is detected in this latter component. X-ray lines are used to derive the coronal temperature and emission measure, which indicate that the dominant radiation mechanism of the plage-associated component is due to thermal bremsstrahlung while the gyroresonance absorption coefficient must be invoked to account for the high brightness temperature (approximately 2 x 10 to the 6th K) that is observed in the sunspot associated component. A thin transition zone is proposed to explain the high magnetic field strength (600 G) that is needed in order to reach a high electron temperature close to the sunspot where the magnetic fields are stronger. In addition, a higher temperature gradient above sunspots is consistent with the absence of detectable C IV emission

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