Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Statistical Analysis of the Relation between Coronal Mass Ejections and
  Solar Energetic Particles   To improve the forecasting capability of impactful solar energetic particle
(SEP) events, the relation between coronal mass ejections (CMEs) and SEP events
needs to be better understood. Here we present a statistical study of SEP
occurrences and timescales with respect to the CME source locations and speeds,
considering all 257 fast ($v_{CME}$ $\ge$ 900 km/s) and wide (angular width
$\ge$ 60$^{\circ}$) CMEs that occurred between December 2006 and October 2017.
We associate them with SEP events at energies above 10 MeV. Examination of the
source region of each CME reveals that CMEs more often accompany a SEP event if
they originate from the longitude of E20-W100 relative to the observer.
However, a SEP event could still be absent if the CME is $<$ 2000 km/s. For the
associated CME-SEP pairs, we compute three timescales for each of the SEP
events, following Kahler (2005, 2013); namely the timescale of the onset (TO),
the rise time (TR), and the duration (TD). They are correlated with the
longitude of the CME source region relative to the footpoint of the Parker
spiral ($\Delta\Phi$) and $v_{CME}$. The TO tends to be short for
$|\Delta\Phi|$ $<$ 60$^{\circ}$ . This trend is weaker for TR and TD. The SEP
timescales are only weakly correlated with $v_{CME}$. Positive correlations of
both TR and TD with $v_{CME}$ are seen in poorly connected (large
$|\Delta\Phi|$) events. Additionally, TO appears to be negatively correlated
with $v_{CME}$ for events with small $|\Delta\Phi|$.

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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci