A Burst with Double Radio Spectrum Observed up to 212 GHz

We study a solar flare that occurred on 10 September 2002, in active region NOAA 10105, starting around 14:52 UT and lasting approximately 5 minutes in the radio range. The event was classified as M2. 9 in X-rays and 1N in Hα. Solar Submillimeter Telescope observations, in addition to microwave data...

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Autores principales:	Giménez de Castro, Carlos Guillermo, Cristiani, German Diego, Mandrini, Cristina Hemilse
Publicado:	2013
Materias:	Chromosphere, active Flares, relation to magnetic field Radio bursts, association with flares Radio bursts, microwave X-ray bursts, association with flares
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v284_n2_p541_GimenezdeCastro http://hdl.handle.net/20.500.12110/paper_00380938_v284_n2_p541_GimenezdeCastro
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00380938_v284_n2_p541_GimenezdeCastro
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spelling	paper:paper_00380938_v284_n2_p541_GimenezdeCastro2023-06-08T15:02:49Z A Burst with Double Radio Spectrum Observed up to 212 GHz Giménez de Castro, Carlos Guillermo Cristiani, German Diego Mandrini, Cristina Hemilse Chromosphere, active Flares, relation to magnetic field Radio bursts, association with flares Radio bursts, microwave X-ray bursts, association with flares We study a solar flare that occurred on 10 September 2002, in active region NOAA 10105, starting around 14:52 UT and lasting approximately 5 minutes in the radio range. The event was classified as M2. 9 in X-rays and 1N in Hα. Solar Submillimeter Telescope observations, in addition to microwave data, give a good spectral coverage between 1. 415 and 212 GHz. We combine these data with ultraviolet images, hard and soft X-ray observations, and full-disk magnetograms. Images obtained from Ramaty High Energy Solar Spectroscopic Imager data are used to identify the locations of X-ray sources at different energies, and to determine the X-ray spectrum, while ultraviolet images allow us to characterize the coronal flaring region. The magnetic field evolution of the active region is analyzed using Michelson Doppler Imager magnetograms. The burst is detected at all available radio frequencies. X-ray images (between 12 keV and 300 keV) reveal two compact sources. In the 212 GHz data, which are used to estimate the radio-source position, a single compact source is seen, displaced by 25″ from one of the hard X-ray footpoints. We model the radio spectra using two homogeneous sources, and we combine this analysis with that of hard X-rays to understand the dynamics of the accelerated particles. Relativistic particles, observed at radio wavelengths above 50 GHz, have an electron index evolving with the typical soft-hard-soft behavior. © 2012 Springer Science+Business Media Dordrecht. Fil:Giménez de Castro, C.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cristiani, G.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mandrini, C.H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v284_n2_p541_GimenezdeCastro http://hdl.handle.net/20.500.12110/paper_00380938_v284_n2_p541_GimenezdeCastro
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Chromosphere, active Flares, relation to magnetic field Radio bursts, association with flares Radio bursts, microwave X-ray bursts, association with flares
spellingShingle	Chromosphere, active Flares, relation to magnetic field Radio bursts, association with flares Radio bursts, microwave X-ray bursts, association with flares Giménez de Castro, Carlos Guillermo Cristiani, German Diego Mandrini, Cristina Hemilse A Burst with Double Radio Spectrum Observed up to 212 GHz
topic_facet	Chromosphere, active Flares, relation to magnetic field Radio bursts, association with flares Radio bursts, microwave X-ray bursts, association with flares
description	We study a solar flare that occurred on 10 September 2002, in active region NOAA 10105, starting around 14:52 UT and lasting approximately 5 minutes in the radio range. The event was classified as M2. 9 in X-rays and 1N in Hα. Solar Submillimeter Telescope observations, in addition to microwave data, give a good spectral coverage between 1. 415 and 212 GHz. We combine these data with ultraviolet images, hard and soft X-ray observations, and full-disk magnetograms. Images obtained from Ramaty High Energy Solar Spectroscopic Imager data are used to identify the locations of X-ray sources at different energies, and to determine the X-ray spectrum, while ultraviolet images allow us to characterize the coronal flaring region. The magnetic field evolution of the active region is analyzed using Michelson Doppler Imager magnetograms. The burst is detected at all available radio frequencies. X-ray images (between 12 keV and 300 keV) reveal two compact sources. In the 212 GHz data, which are used to estimate the radio-source position, a single compact source is seen, displaced by 25″ from one of the hard X-ray footpoints. We model the radio spectra using two homogeneous sources, and we combine this analysis with that of hard X-rays to understand the dynamics of the accelerated particles. Relativistic particles, observed at radio wavelengths above 50 GHz, have an electron index evolving with the typical soft-hard-soft behavior. © 2012 Springer Science+Business Media Dordrecht.
author	Giménez de Castro, Carlos Guillermo Cristiani, German Diego Mandrini, Cristina Hemilse
author_facet	Giménez de Castro, Carlos Guillermo Cristiani, German Diego Mandrini, Cristina Hemilse
author_sort	Giménez de Castro, Carlos Guillermo
title	A Burst with Double Radio Spectrum Observed up to 212 GHz
title_short	A Burst with Double Radio Spectrum Observed up to 212 GHz
title_full	A Burst with Double Radio Spectrum Observed up to 212 GHz
title_fullStr	A Burst with Double Radio Spectrum Observed up to 212 GHz
title_full_unstemmed	A Burst with Double Radio Spectrum Observed up to 212 GHz
title_sort	burst with double radio spectrum observed up to 212 ghz
publishDate	2013
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v284_n2_p541_GimenezdeCastro http://hdl.handle.net/20.500.12110/paper_00380938_v284_n2_p541_GimenezdeCastro
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A Burst with Double Radio Spectrum Observed up to 212 GHz

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