Characteristics of type III radio bursts and solar S bursts

The Sun is an active source of radio emission which is often associated with the acceleration of electrons arising from processes such as solar flaresand coronal mass ejections(CMEs). At low radio frequencies (<100 MHz), numerous solar S bursts(where S stands for short) and storms of Type III radio burstshave been observed, that are not directly relates to flares and CMEs. Here, we expand our understanding on the spectral characteristic of these two different types of radio burstsbased on observations from the Low Frequency Array ( LOFAR). On 9 July 2013, over 3000 solar S burstsaccompanied by over 800 Type III radio burstswere observed over a time period of ~8 hours. The characteristics of Type III radio burstsare consistent to previous studies, while S burstsshow narrow bandwidths, durations and drift rates of about 1/2 the drift rate of Type III bursts. Type III burstsand solar S burstsoccur in a region in the corona where plasma emission is the dominant emission mechanism as determined by data constrained density and magnetic field models.