Spatial Characterization of a Flare Using Radio Observations and Magnetic Field Topology |
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| Authors: | G Cristiani G Martinez C H Mandrini C G Giménez De Castro C W Da Silva M G Rovira P Kaufmann |
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| Institution: | (1) Instituto de Astronomía y Física del Espacio, CONICET-UBA, CC. 67, Suc. 28, 1428 Buenos Aires, Argentina;(2) Centro de Radio Astronomia e Astrofísica Mackenzie, Universidade Presbiteriana Mackenzie, Sao Paulo, Brazil;(3) CCS, Universidade Estadual de Campinas, Campinas, SP, Brazil |
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| Abstract: | Using magnetograms, EUV and Hα 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 Hα 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.
Electronic Supplementary Material The online version of this article () contains supplementary material, which is available to authorized users. |
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| Keywords: | Flares Relation to magnetic field Magnetic reconnection Observational signatures Radio burst Association with flares Radio burst Dynamic spectrum Surges |
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