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A Burst with Double Radio Spectrum Observed up to 212 GHz

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Abstract

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.

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Notes

  1. See ‘OSPEX, Reference Guide’, Kim Tolbert, at http://hesperia.gsfc.nasa.gov/ssw/packages/spex/doc/ospex_explanation.htm .

  2. Developed by G. Holman, last revision May 2002. Obtained from the RHESSI site: http://hesperia.usfc.nasa.gov/hessi/modelware.htm .

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Acknowledgements

CGGC is grateful to FAPESP (Proc. 2009/18386-7). CHM and GDC acknowledge financial support from the Argentinian grants UBACyT 20020100100733, PIP 2009-100766 (CONICET), and PICT 2007-1790 (ANPCyT). PJAS is grateful to FAPESP (Proc. 2008/09339-2) and to the European Commission (project HESPE FP7-2010-SPACE-1-263086). GDC and CHM are members of the Carrera del Investigador Científico (CONICET), CGGC is level 2 fellow of CNPq and Investigador Correspondiente (CONICET).

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Authors and Affiliations

  1. CRAAM, Universidade Presbiteriana Mackenzie, 01302-907, São Paulo, Brasil

    C. G. Giménez de Castro, E. Correia & P. Kaufmann

  2. Instituto de Astronomía y Física del Espacio, CONICET-UBA, CC. 67 Suc. 28, 1428, Buenos Aires, Argentina

    C. G. Giménez de Castro, G. D. Cristiani & C. H. Mandrini

  3. Facultad de Ciencias Exactas y Naturales, FCEN-UBA, Buenos Aires, Argentina

    G. D. Cristiani & C. H. Mandrini

  4. Instituto Nacional de Pesquisas Espaciais, São José dos Campos, Brazil

    E. Correia

  5. Centro de Componentes Semicondutores, Universidade Estadual de Campinas, Campinas, Brasil

    P. Kaufmann

  6. School of Physics & Astronomy, University of Glasgow, Glasgow, Scotland, UK

    P. J. A. Simões

Authors
  1. C. G. Giménez de Castro
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  2. G. D. Cristiani
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  3. P. J. A. Simões
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  4. C. H. Mandrini
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  5. E. Correia
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  6. P. Kaufmann
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Correspondence to C. G. Giménez de Castro.

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Advances in European Solar Physics

Guest Editors: Valery M. Nakariakov, Manolis K. Georgoulis, and Stefaan Poedts

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Giménez de Castro, C.G., Cristiani, G.D., Simões, P.J.A. et al. A Burst with Double Radio Spectrum Observed up to 212 GHz. Sol Phys 284, 541–558 (2013). https://doi.org/10.1007/s11207-012-0173-8

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