Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhancement in Surface Atmospheric Pressure Variability Associated with
  a Major Geomagnetic Storm   Observational studies indicate that there is a close association between
geomagnetic storm and meteorological parameters. Geomagnetic field lines follow
closely the isobars of surface pressure . A Physical mechanism linking upper
atmospheric geomagnetic storm disturbances with tropospheric weather has been
proposed by the author and her group where it is postulated that vertical
mixing by turbulent eddy fluctuations results in the net transport upward of
positive charges originating from lower levels accompanied simultaneously by
downward flow of negative charges from higher levels. The present study reports
enhancement of high frequency (<15 days period) fluctuations in daily surface
pressure during March 1989 in association with major geomagnetic storm (Ap
index = 246) on 13 march 1989.

2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th