Coronal plasmas on the sun and nearby stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Coronal Holes, Coronal Loops, Microwave Emission, Solar Activity, Solar Wind, Angular Resolution, Field Strength, Line Spectra, Nonthermal Radiation, Radio Astronomy, Solar Magnetic Field, Thermal Radiation

Scientific paper

The current understanding of the quiescent, or non-flaring, microwave emission from solar active regions is summarized. The thermal radiation mechanisms that account for most of the quiescent emission is reviewed, while it is also pointed out that current-amplified magnetic fields or non-thermal radiation may be required in some instances. The 20 cm radiation of coronal loops and the thermal cyclotron lines that accurately specify their magnetic field strength are discussed. The 20 cm and X ray emission of the coronal plasma are then compared. The coronae of nearby stars is next discussed, where coherent radiation processes seem to prevail. Some thoughts toward directions for future exploration are given.

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