The sun at 8.5 MM wavelength - Results of observations with high angular resolution

Physics

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High Resolution, Microwave Emission, Millimeter Waves, Solar Radio Emission, H Alpha Line, Photosphere, Solar Activity, Solar Granulation, Solar Magnetic Field

Scientific paper

High resolution single dish observations of the solar radio emission with the Effelsberg 100-m telescope at 8.5 mm wavelength show a good correlation of small 'active' regions, seen in 'quiet sun' areas, associated with the longitudinal magnetic fields, but not with structures seen in H-alpha light. Some characteristics of these 8.5 mm structures, such as diameter and temperature, point to a correlation with supergranular cells. Although the lifetime of these structures is longer than several hours, weak intensity variations within a time scale of minutes could be recorded. From the observational results it was possible to derive roughly an energy dissipation rate for the 8.5 mm structures. This value is a factor of 100 higher than that obtained earlier at 2.8 cm wavelength in a similar manner. A center-to-limb variation at 8.5 mm, especially a limb brightening, could not be detected.

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