Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of galactic cosmic ray spallation events from the SoHO
  mission 20-Year operation of LASCO   A shower of secondary Cosmic Ray (CR) particles is produced at high altitudes
in the Earth's atmosphere, so the primordial Galactic Cosmic Rays (GCRs) are
never directly measured outside the Earth magnetosphere and atmosphere. They
approach the Earth and other planets in the complex pattern of rigidity's
dependence, generally excluded by the magnetosphere. GCRs revealed by images of
single nuclear reactions also called spallation events are described here. Such
an event was seen on Nov. 29, 2015 using a unique LASCO C3 space coronagraph
routine image taken during the Solar and Heliospheric Observatory (SoHO)
mission observing uninterruptedly at the Lagrangian L1 point. The spallation
signature of a GCR identified well outside the Earth's magnetosphere is
obtained for the 1st time. The resulting image includes different diverging
linear "tracks" of varying intensity, leading to a single pixel, this frame
identifies the site on the silicon CCD chip of the coronagraph camera. There
was no solar flare reported at that time, nor Coronal Mass Ejection (CME) and
no evidence of optical debris around the spacecraft. More examples of smaller
CR events have been discovered through the 20 years of continuous observations
from SoHO. This is the first spallation event from a CR, recorded outside the
Earth's magnetosphere. We evaluate the probable energy of these events
suggesting a plausible galactic source.
  Key words: Sun: Galactic Cosmic Rays, Solar Energetic Particles, Heliosphere.

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The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
2
The categories of this paper are: math
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ph
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas