Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multilayer modeling of the aureole photometry during the Venus transit:
  comparison between SDO/HMI and VEx/SOIR data   The mesosphere of Venus is a critical range of altitudes in which complex
temperature variability has been extensively studied by the space mission Venus
Express (Vex) during its eight-years mission (2006-2014). Data collected at
different epochs and latitudes show evidence of short and medium timescale
variability as well as latitudinal differences. Spatial and temporal
variability is also predicted in mesospheric and thermosphere terminator models
with lower boundary conditions at 70 km near cloud tops. The Venus transit on
June 5-6 2012 was the first to occur with a spacecraft in orbit around Venus.
It has been shown that sunlight refraction in the mesosphere of Venus is able
to provide useful constraints on mesospheric temperatures at the time of the
transit. The European Space Agency's Venus Express provided space-based
observations of Venus during the transit. Simultaneously, the Venus aureole
photometry was observed using ground-based facilities and solar telescopes
orbiting Earth (NASA Solar Dynamic Observatory, JAXA HINODE). As the properties
of spatial and temporal variability of the mesosphere are still debated, the
opportunity of observing it at all latitudes at the same time, offered by the
transit, is rather unique. In this first paper, we establish new methods for
analyzing the photometry of the so-called aureole that is produced by
refraction of the solar light, and we investigate the choice of physical models
that best reproduce the observations. We obtain an independent constraint of
4.8 +/- 0.5 km for the aerosol scale height in the upper haze region above 80
km. We show that a full multiple-layer approach is required to adequately
reproduce the aureole photometry, which appears to be sensitive to several
second-order variations in the vertical refractivity.

28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
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The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys