Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A multi-wavelength analysis of small-scale brightenings observed by IRIS   Small-scale brightenings in solar atmospheric observations are a
manifestation of heating and/or energy transport events. We present statistical
characteristics of brightenings from a new detection method applied to 1330,
1400, and 2796 \AA\ IRIS slitjaw image time series. 2377 events are recorded
which coexist in all three channels, giving high confidence that they are real.
$\approx$1800 of these are spatially coherent, equating to event densities of
$\sim9.7\times10^{-5}$arcsec$^{-2}$s$^{-1}$ within a
$90\arcsec\times100\arcsec$ FOV over 34.5 minutes. Power Law indices estimates
are determined for total brightness ($2.78<\alpha<3.71$), maximum brightness
($3.84<\alpha<4.70$), and average area ($4.31<\alpha<5.70$) distributions.
Duration and speed distributions do not obey a power law. A correlation is
found between the events' spatial fragmentation, area, and duration, and a weak
relationship with total brightness, showing that larger/longer-lasting events
are more likely to fragment during their lifetime. Speed distributions show
that all events are in motion, with an average speed of $\sim7$\kms. The
events' spatial trajectories suggest that cooler 2796 \AA\ events tend to
appear slightly later, and occupy a different position/trajectory to the hotter
channel results. This suggests that either many of these are impulsive events
caused by reconnection, with subsequent rapid cooling, or that the triggering
event occurs near the TR, with a subsequent propagating disturbance to cooler
atmospheric layers. The spatial distribution of events is not uniform, with
broad regions devoid of events. A comparison of spatial distribution with
properties of other atmospheric layers shows a tentative connection between
high magnetic field strength, the corona's multithermality, and high IRIS
brightening activity.

27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an