Statistical Survey of Type III Radio Bursts at Long Wavelengths Observed by the Solar TErrestrial RElations Observatory (STEREO)/Waves Instruments: Radio Flux Density Variations with Frequency
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We have performed a statistical study of 152 Type III radio bursts observed by Solar TErrestrial RElations Observatory (STEREO)/Waves between May 2007 and February 2013. We investigated the flux density between 125 kHz and 16 MHz. Both high- and low-frequency cutoffs were observed in 60 % of events, suggesting an important role of propagation. As already reported by previous authors, we observed that the highest flux density occurs at 1 MHz on both spacecraft. We developed a simplified analytical model of the flux density as a function of radial distance and compared it with the STEREO/Waves data.
KeywordsSolar radio emissions Plasma radiation
The authors would like to thank the many individuals and institutions who contributed to making STEREO/Waves possible. J. Soucek acknowledges the support of the Czech Grant Agency grant GAP209/12/2394. O. Kruparova thanks for the support of the Czech Grant Agency grant GP13-37174P. Financial support by STFC and by the European Commission through the “Radiosun” (PEOPLE-2011-IRSES-295272) is gratefully acknowledged (E.P. Kontar). O. Santolik and V. Krupar acknowledge the support of the Czech Grant Agency grant GAP205/10/2279.
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