English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We analyzed ground-based low frequency ($<$100\,MHz) radio spectral andimaging data of the solar corona obtained with the facilities in theGauribidanur observatory during the same time as the very weak soft X-rayflares (sub A-class, flux $\rm {<}10^{-7}\,Wm^{-2}$ in the 1\,-\,8\,$\rm {\AA}$wavelength range) from the `quiet' Sun observed with the X-ray Solar Monitor(XSM) onboard Chandrayaan-2 during the recent solar minimum. Non-thermal type Iradio burst activity were noticed in close temporal association with the X-rayevents. The estimated brightness temperature ($T_{b}$) of the bursts at atypical frequency like 80\,MHz is ${\approx}3{\times}10^{5}$\,K.Extreme-ultraviolet (EUV) observations at 94{\AA} with the Atmospheric ImagingAssembly (AIA) onboard the Solar Dynamics Observatory (SDO) revealed abrightening close to the same location and time as the type I radio bursts. Asfar as we know reports of simultaneous observations of X-ray and/or EUVcounterpart to weak transient radio emission at low frequencies from the`quiet' Sun in particular are rare. Considering this and the fact that lowfrequency radio observations are sensitive to weak energy releases in the solaratmosphere, the results indicate that coordinated observations of similarevents would be useful to understand transient activities in the `quiet' Sun.

Radio, X-ray and extreme-ultraviolet observations of weak energy releases in the `quiet' Sun