Observed flux density enhancement at submillimeter wavelengths during an X-class flare

We analyse the 30 October, 2004, X1.2/SF solar event that occurred in AR 10691 (N13 W18) at around 11:44 UT. Observations at 212 and 405 GHz of the Solar Submillimeter Telescope (SST), with high time resolution (5 ms), show an intense impulsive burst followed by a long-lasting thermal phase. EUV ima...

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Autores principales: Cristiani, G., Giménez de Castro, C.G., Luoni, M.L., Mandrini, C.H., Rovira, M.G., Kaufmann, P., Machado, M.
Formato: JOUR
Materias:
Flares
Radio microwave
Radio Submillimeter
Solar Physics
Image analysis
Microwaves
Natural frequencies
Space telescopes
Spectrum analysis
X ray scattering
Radio Solar Telescope Network (RSTN)
Solar Submillimeter Telescope (SST)
Time resolution
Turnover frequency
Solar system
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02731177_v39_n9_p1445_Cristiani
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_02731177_v39_n9_p1445_Cristiani
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spelling todo:paper_02731177_v39_n9_p1445_Cristiani2023-10-03T15:15:37Z Observed flux density enhancement at submillimeter wavelengths during an X-class flare Cristiani, G. Giménez de Castro, C.G. Luoni, M.L. Mandrini, C.H. Rovira, M.G. Kaufmann, P. Machado, M. Flares Radio microwave Radio Submillimeter Solar Physics Image analysis Microwaves Natural frequencies Space telescopes Spectrum analysis X ray scattering Radio Solar Telescope Network (RSTN) Solar Physics Solar Submillimeter Telescope (SST) Time resolution Turnover frequency Solar system We analyse the 30 October, 2004, X1.2/SF solar event that occurred in AR 10691 (N13 W18) at around 11:44 UT. Observations at 212 and 405 GHz of the Solar Submillimeter Telescope (SST), with high time resolution (5 ms), show an intense impulsive burst followed by a long-lasting thermal phase. EUV images from the Extreme Ultraviolet Imaging Telescope (SOHO/EIT) are used to identify the possible emitting sources. Data from the Radio Solar Telescope Network (RSTN) complement our spectral observations below 15 GHz. During the impulsive phase the turnover frequency is above 15.4 GHz. The long-lasting phase is analysed in terms of thermal emission and compared with GOES observations. From the ratio between the two GOES soft X-ray bands, we derive the temperature and emission measure, which is used to estimate the free-free submillimeter flux density. Good temporal agreement is found between the estimated and observed profiles, however the former is larger than the latter. © 2007 COSPAR. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02731177_v39_n9_p1445_Cristiani
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Flares
Radio microwave
Radio Submillimeter
Solar Physics
Image analysis
Microwaves
Natural frequencies
Space telescopes
Spectrum analysis
X ray scattering
Radio Solar Telescope Network (RSTN)
Solar Physics
Solar Submillimeter Telescope (SST)
Time resolution
Turnover frequency
Solar system
spellingShingle Flares
Radio microwave
Radio Submillimeter
Solar Physics
Image analysis
Microwaves
Natural frequencies
Space telescopes
Spectrum analysis
X ray scattering
Radio Solar Telescope Network (RSTN)
Solar Physics
Solar Submillimeter Telescope (SST)
Time resolution
Turnover frequency
Solar system
Cristiani, G.
Giménez de Castro, C.G.
Luoni, M.L.
Mandrini, C.H.
Rovira, M.G.
Kaufmann, P.
Machado, M.
Observed flux density enhancement at submillimeter wavelengths during an X-class flare
topic_facet Flares
Radio microwave
Radio Submillimeter
Solar Physics
Image analysis
Microwaves
Natural frequencies
Space telescopes
Spectrum analysis
X ray scattering
Radio Solar Telescope Network (RSTN)
Solar Physics
Solar Submillimeter Telescope (SST)
Time resolution
Turnover frequency
Solar system
description We analyse the 30 October, 2004, X1.2/SF solar event that occurred in AR 10691 (N13 W18) at around 11:44 UT. Observations at 212 and 405 GHz of the Solar Submillimeter Telescope (SST), with high time resolution (5 ms), show an intense impulsive burst followed by a long-lasting thermal phase. EUV images from the Extreme Ultraviolet Imaging Telescope (SOHO/EIT) are used to identify the possible emitting sources. Data from the Radio Solar Telescope Network (RSTN) complement our spectral observations below 15 GHz. During the impulsive phase the turnover frequency is above 15.4 GHz. The long-lasting phase is analysed in terms of thermal emission and compared with GOES observations. From the ratio between the two GOES soft X-ray bands, we derive the temperature and emission measure, which is used to estimate the free-free submillimeter flux density. Good temporal agreement is found between the estimated and observed profiles, however the former is larger than the latter. © 2007 COSPAR.
format JOUR
author Cristiani, G.
Giménez de Castro, C.G.
Luoni, M.L.
Mandrini, C.H.
Rovira, M.G.
Kaufmann, P.
Machado, M.
author_facet Cristiani, G.
Giménez de Castro, C.G.
Luoni, M.L.
Mandrini, C.H.
Rovira, M.G.
Kaufmann, P.
Machado, M.
author_sort Cristiani, G.
title Observed flux density enhancement at submillimeter wavelengths during an X-class flare
title_short Observed flux density enhancement at submillimeter wavelengths during an X-class flare
title_full Observed flux density enhancement at submillimeter wavelengths during an X-class flare
title_fullStr Observed flux density enhancement at submillimeter wavelengths during an X-class flare
title_full_unstemmed Observed flux density enhancement at submillimeter wavelengths during an X-class flare
title_sort observed flux density enhancement at submillimeter wavelengths during an x-class flare
url http://hdl.handle.net/20.500.12110/paper_02731177_v39_n9_p1445_Cristiani
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