Abstract
It is well established that solar Type-II radio bursts are signatures of magnetohydrodynamical (MHD) shock waves propagating outward through the solar corona. Nevertheless, there are long-standing controversies about how these shocks are formed; solar flares and the coronal mass ejections (CMEs) are considered to be the most likely drivers. We present the results of the analysis of four solar Type-II bursts recorded between 20 January 2010 and 17 November 2011 by the Compound Astronomical Low-frequency Low-cost Instrument for Spectroscopy in Transportable Observatories (CALLISTO-BR) (in Brazil), which operates in the frequency range of 45 – 870 MHz. For all four solar Type-II radio bursts, which consisted of one event without band splitting and three split-band variants, the outcomes are consistent with those reported in the literature. All four Type-II radio bursts were accompanied by both solar flares and CMEs, which are associated with the impulsive phase of the flares and, very likely, with the acceleration phase of the CMEs.
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Acknowledgements
The research carried out by CELESTE was supported by CNPq (Proc. 480045/2008-9). The authors acknowledge financial support from the São Paulo Research Foundation (FAPESP), grant number 2012/08445-9. The authors acknowledge the e-CALLISTO science team and the solar physics group of INPE, particularly H.S. Sawant, for providing the solar data. RDCS acknowledges a scholarship from the São Paulo Research Foundation (FAPESP), grant number 2012/00009-5, and financial support from CAPES and UNIVAP-FVE. FCRF thanks CNPq for a scholarship granted under process 308755/2012-0. The authors are grateful to the anonymous referee for the significant and constructive remarks that helped to improve the quality and the presentation of this article.
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Cunha-Silva, R.D., Fernandes, F.C.R. & Selhorst, C.L. Solar Type II Radio Bursts Recorded by the Compound Astronomical Low-Frequency Low-Cost Instrument for Spectroscopy in Transportable Observatories in Brazil. Sol Phys 289, 4607–4620 (2014). https://doi.org/10.1007/s11207-014-0586-7
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DOI: https://doi.org/10.1007/s11207-014-0586-7