Simultaneous observations of 20 centimeter bright points and He I 10830 A dark points in the quiet sun

Astronomy and Astrophysics – Astronomy

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Centimeter Waves, Magnetic Flux, Solar Corona, Solar Magnetic Field, Solar Radio Emission, Line Of Sight, Magnetic Field Configurations, Radio Astronomy, X Ray Sources

Scientific paper

The authors present the results of the first simultaneous observations of the quiet Sun made at the 20 cm radio wavelength and in the He I λ10830 line. Simultaneous magnetic field measurements were also obtained with lower time resolution during the five consecutive hours of observations. In the 512arcsec×512arcsec common observing field of view the authors find that the 20 cm radio emisison, which originates from the low corona-transition region, is always associated with regions of enhances He I absorption; yet, it does not always coincide with strong He I λ10830 absorption regions known as He I "dark points". The temporal changes of the 20 cm emission and the underlying He I absorption are also studied.

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