Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Simulations of Particle Impact at Lunar Magnetic Anomalies and
  Comparison with Spectral Observations   Ever since the Apollo era, a question has remained as to the origin of the
lunar swirls (high albedo regions coincident with the regions of surface
magnetization). Different processes have been proposed for their origin. In
this work we test the idea that the lunar swirls have a higher albedo relative
to surrounding regions because they deflect incoming solar wind particles that
would otherwise darken the surface. 3D particle tracking is used to estimate
the influence of five lunar magnetic anomalies on incoming solar wind. The
regions investigated include Mare Ingenii, Gerasimovich, Renier Gamma,
Northwest of Apollo and Marginis. Both protons and electrons are tracked as
they interact with the anomalous magnetic field and impact maps are calculated.
The impact maps are then compared to optical observations and comparisons are
made between the maxima and minima in surface fluxes and the albedo and optical
maturity of the regions. Results show deflection of slow to typical solar wind
particles on a larger scale than the fine scale optical, swirl, features. It is
found that efficiency of a particular anomaly for deflection of incoming
particles does not only scale directly with surface magnetic field strength,
but also is a function of the coherence of the magnetic field. All anomalous
regions can also produce moderate deflection of fast solar wind particles. The
anomalies' influence on ~ 1 GeV SEP particles is only apparent as a slight
modification of the incident velocities.

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The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci