IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
The Time-Extended Phase of Solar Flares at MM-SUBMM Wavelengths
Autor/es:
RAULIN, J.-P; TROTTE, GERARD; GIMÉNEZ DE CASTRO, C. G.; LUTHI, T; CASPI, A.; MANDRINI, C.H.; LUONI, M. L.; KAUFMANN, P.
Lugar:
Las Cruces, Nueva méxico, USA
Reunión:
Congreso; Solar Physics Division , American Astronomical Society, Meeting 42; 2011
Institución organizadora:
Solar Physics Division de la American Astronomical Society
Resumen:
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.