ABSTRACT
Using the e-CALLISTO network radio observations on 1st June 2015, we present an analysis of
the complex type III and type II solar radio bursts during low activity. This event occurred on 1st July
2015 at 13:52 UT (complex solar burst type III) and 13:40 UT – 13:44 UT (solar burst type II). Solar
burst type detected at (i) BIR, (ii) BLENSW, (iii) Essen, (iv) Glascow (v) Osra, (vi) Rwanda. The
spectral shape consists of high flux densities at meter wavelengths. The energy going into plasma
heating during each flare was estimated by computing the time evolution of the energy content of the
thermal plasma and obtaining the peak value. This constitutes a lower limit to the thermal energy,
since it does not account for the cooling of the plasma prior to this time nor to any heating at later
times. It is also believed that the meter wavelength branch of the this type III spectrum may be
attributable to second-phase accelerated electrons to form type II burst. There are four sunspots of the
active regions (AR2355, AR2356, AR2357, and AR2358) during this event. The solar wind recorded
during the event is 342.4 km/s and the density of the proton recorded is 4.1 protons/cm3
. Moreover, the are some evidence that radio-quiet CMEs mostly came from the edges of the sun. The main goal of
this study was to determine whether is there any possibilities that the radio burst can be formed even
the Sun is at low activity and this event is one of the candidate events.
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