Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Detection and characterization of 0.5-8 MeV neutrons near
  Mercury: Evidence for a solar origin"   We argue that the hour-long neutron transient detected by the MErcury
Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) Neutron
Spectrometer beginning at 15:45 UT on 2011 June 4 is due to secondary neutrons
from energetic protons interacting in the spacecraft. The protons were probably
accelerated by a shock that passed the spacecraft about thirty minutes earlier.
We reach this conclusion after a study of data from the MESSENGER neutron
spectrometer, gamma-ray spectrometer, X-ray Spectrometer, and Energetic
Particle Spectrometer, and from the particle spectrometers on STEREO A. Our
conclusion differs markedly from that given by Lawrence et al. [2014] who
claimed that there is "strong evidence" that the neutrons were produced by the
interaction of ions in the solar atmosphere. We identify significant faults
with the authors' arguments that led them to that conclusion.

17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an