INVESTIGADORES
MANDRINI Cristina Hemilse
congresos y reuniones científicas
Título:
The Time-Extended Phase of Solar Flares at MM-SUBMM Wavelengths
Autor/es:
RAULIN, J.P; TROTTET, G.; GIMÉNEZ DE CASTRO, C.G.; LUTHI, T.; CASPI, A.; MANDRINI, C.H.; LUONI, M.L.; KAUFMANN, P.
Reunión:
Congreso; American Astronomical Society, SPD meeting N 42; 2011
Institución organizadora:
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.