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
  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 have investigated the flux density between $125$kHz and $16$MHz. Both high- and low-frequency cutoffs have been observed in $60\,%$ of events suggesting an important role of propagation. As already reported by previous authors, we observed that the maximum flux density occurs at $1$MHz on both spacecraft. We have developed a simplified analytical model of the flux density as a function of radial distance and compared it to the STEREO/Waves data. 
V. Krupar, M. Maksimovic, O. Santolik, E. P. Kontar, B. Cecconi, S.   Hoang, O. Kruparova, J. Soucek, H. Reid, A. Zaslavsky
astro-ph.SR astro-ph.EP physics.space-ph