“…Frequency in $ 10 2 MHz to < 10 GHz corresponds to source density of a few 10 8 -10 11 cm À3 , which includes the density range where primary energy release of flares should take place (Bastian et al, 1998;Benz, 2004;Gary and Keller, 2004). Temporal fine structures (FS) of solar radio emission in solar flares have been found in various wavebands for several decades (Allaart et al, 1990;Guedel and Benz, 1990;Bruggmann et al, 1990;Benz et al, 1992;Sawant et al, 1994;Isliker and Benz, 1994;Jiricka et al, 2001;Ma et al, 2003;Meszarosova et al, 2003;Fu et al, 2004b;Meszarosova et al, 2005;Yan et al, 2005;Magdalenic et al, 2006).…”