Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The CH$_4$ abundance in Jupiter's upper atmosphere   Hydrocarbon species, and in particular CH$_4$, play a key role in the
stratosphere--thermosphere boundary of Jupiter, which occurs around the
$\mu$-bar pressure level. Previous analyses of solar occultation, He and
Ly-$\alpha$ airglow, and ISO/SWS measurements of the radiance around 3.3 $\mu$m
have inferred significantly different methane concentrations. Here we aim to
accurately model the CH$_4$ radiance at 3.3 $\mu$m measured by ISO/SWS by using
a comprehensive non-local thermodynamic equilibrium model and the most recent
collisional rates measured in the laboratory for CH$_4$ to shed new light onto
the methane concentration in the upper atmosphere of Jupiter. These emission
bands have been shown to present a peak contribution precisely at the $\mu$-bar
level, hence directly probing the region of interest. We find that a high
CH$_4$ concentration is necessary to explain the data, in contrast with the
most recent analyses, and that the observations favour the lower limit of the
latest laboratory measurements of the CH$_4$ collisional relaxation rates. Our
results provide precise constraints on the composition and dynamics of the
lower atmosphere of Jupiter.

22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg