Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Global Transients in ultraviolet and red-infrared ranges from data of
  the "Universitetsky-Tatiana-2" satellite   Detectors of fast flashes (duration of 1-128 ms) in near ultraviolet (240-400
nm) and red-infrared (>610 nm) ranges on board the "Universitetsky-Tatiana-2"
satellite have measured transient luminous events global distribution. Events
with number of photons 10^20-5{\cdot}10^21 radiated in the atmosphere are
uniformly distributed over latitudes and longitudes. Events with number of
photons more than 5{\cdot}10^21 are concentrated near the equator above
continents. Measured ratio of photons number radiated in red-IR range to
photons number radiated in UV related to excitation of nitrogen molecular
indicates a high altitude (>50 km) of the atmospheric electric discharges
responsible for the observed transients. Series of every minute transients
(from 3 to 16 transients in the series) were observed. The detection of
transients out of thunderstorm area, in cloudless region- sometimes thousands
km away of thunderstorms is remarkable. The obtained data allow us to assume
that transient events are not only consequences of lightning in event-by-event
way but they are the result of "long distance" influence of thunderstorm
electric activity causing breakdowns in the upper atmosphere (at altitudes >50
km).

31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
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The categories of this paper are: econ
9
The categories of this paper are: nlin