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Type: Artigo de periódico
Title: Spatial characterization of a flare using radio observations and magnetic field topology
Author: Cristiani, G
Martinez, G
Mandrini, CH
De Castro, CGG
Da Silva, CW
Rovira, MG
Kaufmann, P
Abstract: Using magnetograms, EUV and H alpha images, Owens Valley Solar Array microwave observations, and 212-GHz flux density derived from the Solar Submillimeter Telescope data, we determine the spatial characteristics of the 1B/M6.9 flare that occurred on November 28, 2001, starting at 16:26 UT in active region (AR) NOAA 9715. This flare is associated with a chromospheric mass ejection or surge observed at 16:42 UT in the H alpha images. We compute the coronal magnetic field under the linear force-free field assumption, constrained by the photospheric data of the Michelson Doppler Imager and loops observed by the Extreme Ultraviolet Imaging Telescope. The analysis of the magnetic field connectivity allows us to conclude that magnetic field reconnection between two different coronal/chromospheric sets of arches was at the origin of the flare and surge, respectively. The optically thick microwave spectrum at peak time shows a shape compatible with the emission from two different sites. Fitting gyrosynchrotron emission to the observed spectrum, we derive parameters for each source.
Subject: flares
relation to magnetic field
magnetic reconnection
observational signatures
radio burst
association with flares
radio burst
dynamic spectrum
Country: Holanda
Editor: Springer
Rights: fechado
Identifier DOI: 10.1007/s11207-006-0337-5
Date Issue: 2007
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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