caa a22 4500 445347317 CHVBK 20180317142832.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s11207-011-9875-6 doi (NATIONALLICENCE)springer-10.1007/s11207-011-9875-6 Origin of the Submillimeter Radio Emission During the Time-Extended Phase of a Solar Flare [Elektronische Daten] [G. Trottet, J.-P. Raulin, G. GiménezdeCastro, T. Lüthi, A. Caspi, C. Mandrini, M. Luoni, P. Kaufmann] Solar flares observed in the 200 - 400GHz 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 27October2003 (M6.7) flare, combining 1 - 345GHz total-flux radio measurements with X-ray, EUV, and Hα observations. We find that the time-extended radio emission is, as expected, radiated by thermal bremsstrahlung. Up to 230GHz, it is entirely produced in the corona by hot and cool materials at 7 - 16MK and 1 - 3MK, respectively. At 345GHz, there is an additional contribution from chromospheric material at a few 104K. 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. Springer Science+Business Media B.V., 2011 Radio bursts, association with flares nationallicence Radio bursts, microwave nationallicence X-ray bursts, association with flares nationallicence Flares, relation to magnetic field nationallicence Chromosphere, active nationallicence Trottet G. Observatoire de Paris, LESIA-CNRS UMR 8109, Univ. P & M Curie and Paris-Diderot, Observatoire de Meudon, 92195, Meudon, France aut Raulin J.-P CRAAM Universidade Presbiteriana Mackenzie, São Paulo, Brazil aut GiménezdeCastro G. CRAAM Universidade Presbiteriana Mackenzie, São Paulo, Brazil aut Lüthi T. Hexagon Metrology, Leica Geosystem AG, Moenchmattweg 5, 5035, Unterenfelden, Switzerland aut Caspi A. Space Sciences Laboratory, University of California, 94720-7450, Berkeley, CA, USA aut Mandrini C. Instituto de Astronomía y Física del Espacio, CONICET-UBA, CC. 67 Suc. 28, 1428, Buenos Aires, Argentina aut Luoni M. Instituto de Astronomía y Física del Espacio, CONICET-UBA, CC. 67 Suc. 28, 1428, Buenos Aires, Argentina aut Kaufmann P. CRAAM Universidade Presbiteriana Mackenzie, São Paulo, Brazil aut Solar Physics Springer Netherlands 273/2(2011-11-01), 339-361 0038-0938 273:2<339 2011 273 11207 https://doi.org/10.1007/s11207-011-9875-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-011-9875-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Trottet G. Observatoire de Paris, LESIA-CNRS UMR 8109, Univ. P & M Curie and Paris-Diderot, Observatoire de Meudon, 92195, Meudon, France aut NATIONALLICENCE 700 1- Raulin J.-P CRAAM Universidade Presbiteriana Mackenzie, São Paulo, Brazil aut NATIONALLICENCE 700 1- GiménezdeCastro G. CRAAM Universidade Presbiteriana Mackenzie, São Paulo, Brazil aut NATIONALLICENCE 700 1- Lüthi T. Hexagon Metrology, Leica Geosystem AG, Moenchmattweg 5, 5035, Unterenfelden, Switzerland aut NATIONALLICENCE 700 1- Caspi A. Space Sciences Laboratory, University of California, 94720-7450, Berkeley, CA, USA aut NATIONALLICENCE 700 1- Mandrini C. Instituto de Astronomía y Física del Espacio, CONICET-UBA, CC. 67 Suc. 28, 1428, Buenos Aires, Argentina aut NATIONALLICENCE 700 1- Luoni M. Instituto de Astronomía y Física del Espacio, CONICET-UBA, CC. 67 Suc. 28, 1428, Buenos Aires, Argentina aut NATIONALLICENCE 700 1- Kaufmann P. CRAAM Universidade Presbiteriana Mackenzie, São Paulo, Brazil aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 273/2(2011-11-01), 339-361 0038-0938 273:2<339 2011 273 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer