The Time-Extended Phase of Solar Flares at MM-SUBMM Wavelengths

Details The Time-Extended Phase of Solar Flares at MM-SUBMM Wavelengths The Time-Extended Phase of Solar Flares at MM-SUBMM Wavelengths

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1206r&link_type=abstract

American Astronomical Society, SPD meeting #42, #12.06; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We give a brief overview of the observations of the few flare which exhibit a slowly-varying and time-extended phase lasting for tens of minutes after the impulsive phase, and which are detected in radio up to submillimeter wavelengths. We present a detailed analysis of the 2003 October 27 event at 12:30 UT, which shows such a gradual phase. The radio, UV/EUV, X-ray and optical observations of the gradual phase are consistent with thermal bremsstrahlung from coronal material at two temperatures which is optically thick below 8 GHz and optically thin at higher frequencies. At 345 GHz there is a flux density excess with respect to the optically-thin emission which arises from the chromosphere. We show that these findings constitute a challenge for the modeling of the chromospheric response to energy deposition during solar flares.

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