Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cassini in situ observations of long-duration magnetic reconnection in
  Saturn's magnetotail   Magnetic reconnection is a fundamental process in solar system and
astrophysical plasmas, through which stored magnetic energy associated with
current sheets is converted into thermal, kinetic and wave energy. Magnetic
reconnection is also thought to be a key process involved in shedding
internally produced plasma from the giant magnetospheres at Jupiter and Saturn
through topological reconfiguration of the magnetic field. The region where
magnetic fields reconnect is known as the diffusion region and in this letter
we report on the first encounter of the Cassini spacecraft with a diffusion
region in Saturn's magnetotail. The data also show evidence of magnetic
reconnection over a period of 19 h revealing that reconnection can, in fact,
act for prolonged intervals in a rapidly rotating magnetosphere. We show that
reconnection can be a significant pathway for internal plasma loss at Saturn.
This counters the view of reconnection as a transient method of internal plasma
loss at Saturn. These results, although directly relating to the magnetosphere
of Saturn, have applications in the understanding of other rapidly rotating
magnetospheres, including that of Jupiter and other astrophysical bodies.

27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph