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Type: Artigo de periódico
Title: Origin of the Submillimeter Radio Emission During the Time-Extended Phase of a Solar Flare
Author: Trottet, G
Raulin, JP
de Castro, GG
Luthi, T
Caspi, A
Mandrini, CH
Luoni, ML
Kaufmann, P
Abstract: Solar flares observed in the 200 -aEuro parts per thousand 400 GHz radio domain may exhibit a slowly varying and time-extended component which follows a short (few minutes) impulsive phase and can last for a few tens of minutes to more than one hour. The few examples discussed in the literature indicate that such long-lasting submillimeter emission is most likely thermal bremsstrahlung. We present a detailed analysis of the time-extended phase of the 27 October 2003 (M6.7) flare, combining 1 -aEuro parts per thousand 345 GHz total-flux radio measurements with X-ray, EUV, and H alpha observations. We find that the time-extended radio emission is, as expected, radiated by thermal bremsstrahlung. Up to 230 GHz, it is entirely produced in the corona by hot and cool materials at 7 -aEuro parts per thousand 16 MK and 1 -aEuro parts per thousand 3 MK, respectively. At 345 GHz, there is an additional contribution from chromospheric material at a few 10(4) K. These results, which may also apply to other millimeter-submillimeter radio events, are not consistent with the expectations from standard semiempirical models of the chromosphere and transition region during flares, which predict observable radio emission from the chromosphere at all frequencies where the corona is transparent.
Subject: Radio bursts, association with flares
Radio bursts, microwave
X-ray bursts, association with flares
Flares, relation to magnetic field
Chromosphere, active
Country: Holanda
Editor: Springer
Citation: Solar Physics. Springer, v. 273, n. 2, n. 339, n. 361, 2011.
Rights: fechado
Identifier DOI: 10.1007/s11207-011-9875-6
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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