Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic braids in eruptions of a spiral structure in the solar
  atmosphere   We report on high-resolution imaging and spectral observations of eruptions
of a spiral structure in the transition region, which were taken with the
Interface Region Imaging Spectrometer (IRIS), the Atmospheric Imaging Assembly
(AIA) and the Helioseismic and Magnetic Imager (HMI). The eruption coincided
with the appearance of two series of jets, with velocities comparable to the
Alfv\'en speeds in their footpoints. Several pieces of evidence of magnetic
braiding in the eruption are revealed, including localized bright knots,
multiple well-separated jet threads, transition region explosive events and the
fact that all these three are falling into the same locations within the
eruptive structures. Through analysis of the extrapolated three-dimensional
magnetic field in the region, we found that the eruptive spiral structure
corresponded well to locations of twisted magnetic flux tubes with varying curl
values along their lengths. The eruption occurred where strong parallel
currents, high squashing factors, and large twist numbers were obtained. The
electron number density of the eruptive structure is found to be
$\sim3\times10^{12}$ cm$^{-3}$, indicating that significant amount of mass
could be pumped into the corona by the jets. Following the eruption, the
extrapolations revealed a set of seemingly relaxed loops, which were visible in
the AIA 94 \AA\ channel indicating temperatures of around 6.3 MK. With these
observations, we suggest that magnetic braiding could be part of the mechanisms
explaining the formation of solar eruption and the mass and energy supplement
to the corona.

10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
1
The categories of this paper are: cs