Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Plasma heating in a post eruption Current Sheet: a case study based on
  ultraviolet, soft, and hard X-ray data   Off-limb observations of the solar corona after Coronal Mass Ejections (CMEs)
often show strong, compact, and persistent UV sources behind the eruption. They
are primarily observed by the SOHO/UVCS instrument in the "hot" Fe XVIII
{\lambda}974 {\AA} line and are usually interpreted as a signature of plasma
heating due to magnetic reconnection in the post-CME Current Sheet (CS).
Nevertheless, the physical process itself and the altitude of the main energy
release are currently not fully understood. In this work, we studied the
evolution of plasma heating after the CME of 2004 July 28 by comparing UV
spectra acquired by UVCS with soft X-ray (SXR) and hard X-ray (HXR)images of
the post-flare loops taken by GOES/SXI and RHESSI. The X-ray data show a
long-lasting extended source that is rising upwards, toward the
high-temperature source detected by UVCS. UVCS data show the presence of
significant non-thermal broadening in the CS (signature of turbulent motions)
and a strong density gradient across the CS region. The thermal energy released
in the HXR source is on the order of about 10^32 erg, a factor about 2-5 larger
than the energy required to explain the high-temperature plasma sampled by
UVCS. Nevertheless, the very different time evolutions of SXR and HXR sources
compared to the UV emission suggest that reconnection occurring above the
post-eruption arcades are not directly responsible for the high-temperature
plasma sampled higher up by UVCS. We conclude that an additional plasma heating
mechanism (such as turbulent reconnection) in the CS is likely required.

28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn