The small-scale sources of quiet-sun centimeter-wave radio emission

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Centimeter Waves, Interferometry, Solar Activity, Solar Radio Emission, Chromosphere, Circular Polarization, Microwave Emission, Solar Instruments

Scientific paper

The three-element Owens Valley solar interferometer has been used to observe quiet-sun structure at 2.8 cm with angular resolutions of 4.6 to 27 arcsec. Results are compared with previous observations at other centimeter wavelengths in the context of a model based on a random array of optically thick radiators. This comparison argues against coronal sources and rules out the possibility of source distributions such as X-ray bright points and uniquely sized or compact sources. The data are consistent with the most likely remaining possibility, elements of the chromospheric network. The more transient nature of the fringes observed at high resolution can be explained either by a two-component model which includes large stable sources and small unstable sources or in terms of the small-scale motions associated with the network.

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