Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Latitudinal Connectivity of Ground Level Enhancement Events   We examined the source regions and coronal environment of the historical
ground level enhancement (GLE) events in search of evidence for non-radial
motion of the associated coronal mass ejection (CME). For the 13 GLE events
that had source latitudes >30 degrees we found evidence for possible non-radial
CME motion due to deflection by large-scale magnetic structures in nearby
coronal holes, streamers, or pseudo streamers. Polar coronal holes are the main
source of deflection in the rise and declining phases of solar cycles. In the
maximum phase, deflection by large-scale streamers or pseudo streamers
overlying high-latitude filaments seems to be important. The B0 angle reduced
the ecliptic distance of some GLE source regions and increased in others with
the net result that the average latitude of GLE events did not change
significantly. The non-radial CME motion is the dominant factor that reduces
the ecliptic distance of GLE source regions, thereby improving the latitudinal
connectivity to Earth. We further infer that the GLE particles must be
accelerated at the nose part of the CME-driven shocks, where the shock is
likely to be quasi-parallel.

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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: nlin
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The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex