What can we learn about accelerated electrons in coronal loops from analysis of solar type IV radio bursts? Original Research Article

Specific type IV radio burst with fine structure – quasi-periodic broadband pulsations (BBPs) and zebra pattern (ZP), recorded by OSRA spectrograph (Potsdam) on October 25, 1994, is considered as a source of information about electrons accelerated during solar flare. The type IV bursts are generated in coronal trap-like structures (coronal loops) accumulating accelerated electrons. BBP are considered as a result of periodically repeated injections of fast electrons into the magnetic trap. The ZP is well understood as a result of plasma wave instability at the levels of double plasma resonance. Using the observed features of fine structure, we found the number of electrons and energy of electrons capable to provide the observed structure as well as the physical conditions in the coronal magnetic loop.