Is the chromosphere hotter in coronal holes?

Details Is the chromosphere hotter in coronal holes? Is the chromosphere hotter in coronal holes?

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..471..277g&link_type=abstract

The solar wind nine conference. AIP Conference Proceedings, Volume 471, pp. 277-280 (1999).

Astronomy and Astrophysics

Astronomy

1

Astronomical Observations

Scientific paper

Coronal holes are brighter than the quiet Sun in microwaves. Microwave emission from the quiet Sun is optically thick thermal bremsstrahlung from the upper chromosphere. Therefore, the optically thick layer in the coronal hole chromosphere must be hotter than the corresponding layer in the quiet chromosphere. We present microwave and SOHO observations in support of this idea. Because of the availability of simultaneous EUV and microwave images it is now possible to obtain more details of this enigmatic phenomenon. In this paper, we highlight the primary properties of the microwave enhancement in coronal holes and point out some related phenomena. Finally, we summarize the possible explanations of the radio enhancement.

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