Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radio, X-ray and extreme-ultraviolet observations of weak energy
  releases in the `quiet' Sun   We analyzed ground-based low frequency ($<$100\,MHz) radio spectral and
imaging data of the solar corona obtained with the facilities in the
Gauribidanur observatory during the same time as the very weak soft X-ray
flares (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 I
radio burst activity were noticed in close temporal association with the X-ray
events. The estimated brightness temperature ($T_{b}$) of the bursts at a
typical frequency like 80\,MHz is ${\approx}3{\times}10^{5}$\,K.
Extreme-ultraviolet (EUV) observations at 94{\AA} with the Atmospheric Imaging
Assembly (AIA) onboard the Solar Dynamics Observatory (SDO) revealed a
brightening close to the same location and time as the type I radio bursts. As
far as we know reports of simultaneous observations of X-ray and/or EUV
counterpart to weak transient radio emission at low frequencies from the
`quiet' Sun in particular are rare. Considering this and the fact that low
frequency radio observations are sensitive to weak energy releases in the solar
atmosphere, the results indicate that coordinated observations of similar
events would be useful to understand transient activities in the `quiet' Sun.

3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con