Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Properties of chromospheric evaporation and plasma dynamics of a solar
  flare from IRIS observations   Dynamics of hot chromospheric plasma of solar flares is a key to
understanding of mechanisms of flare energy release and particle acceleration.
A moderate M1.0 class flare of 12 June, 2014 (SOL2014-06-12T21:12) was
simultaneously observed by NASA's Interface Region Imaging Spectrograph (IRIS),
other spacecraft, and also by New Solar Telescope (NST) at the BBSO. This paper
presents the first part of our investigation focused on analysis of the IRIS
data. Our analysis of the IRIS data in different spectral lines reveals strong
redshifted jet-like flow with the speed of ~100 km/s of the chromospheric
material before the flare. Strong nonthermal emission of the C II k 1334.5 A
line, formed in the chromosphere-corona transition region, is observed at the
beginning of the impulsive phase in several small (with a size of ~1 arcsec)
points. It is also found that the C II k line is redshifted across the flaring
region before, during and after the impulsive phase. A peak of integrated
emission of the hot (1.1 MK) plasma in the Fe XXI 1354.1 A line is detected
approximately 5 minutes after the integrated emission peak of the lower
temperature C II k. A strong blueshift of the Fe XXI line across the flaring
region corresponds to evaporation flows of the hot chromospheric plasma with a
speed of 50 km/s. Additional analysis of the Reuven Ramaty High-Energy Solar
Spectroscopic Imager (RHESSI) data supports the idea that the upper
chromospheric dynamics observed by IRIS has features of "gentle" evaporation
driven by heating of the solar chromosphere by accelerated electrons and by a
heat flux from the flare energy release site.

22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
16
The categories of this paper are: stat