A search for counterparts of quiet sun radio transients in extreme ultraviolet data

TL;DR

This study investigates the EUV counterparts of quiet sun radio transients to estimate their energy contribution to coronal heating, finding a correlation with EUV brightenings and a flare energy of about 10^{25} ergs.

Contribution

First attempt to identify EUV counterparts of quiet sun radio transients and estimate their coronal energy deposition using established EUV observation techniques.

Findings

Radio transients are associated with EUV brightenings.

Estimated flare energy is approximately 10^{25} ergs.

Potential for large statistical studies of radio-EUV correlations.

Abstract

Recently nonthermal radio transients from the quiet sun have been discovered and it has been hypothesised using rough calculations that they might be important for coronal heating. It is well realized that energy calculations using coherent emissions are often subject to poorly constrained parameters and hence have large uncertainties associated with them. However energy estimates using observations in the extreme ultraviolet (EUV) and soft X-ray bands are routinely done and the techniques are pretty well established. This work presents our first attempt to identify the EUV counterparts of these radio transients and then use the counterpart to estimate the energy deposited into the corona during the event. I show that the group of radio transients studied here was associated with an brightening observed in the extreme ultraviolet waveband and was produced due to a flare of energy $\sim 10^{25}$ ergs. The fact that the flux density of the radio transient is only $\sim 2\,$mSFU suggests that it might be possible to do large statistical studies in future for understanding the relationship between these radio transients and other EUV and X-ray counterparts and also for understanding their importance in coronal heating.