Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic Nonpotentiality in Photospheric Active Regions as a Predictor
  of Solar Flares   Based on several magnetic nonpotentiality parameters obtained from the vector
photospheric active region magnetograms obtained with the Solar Magnetic Field
Telescope at the Huairou Solar Observing Station over two solar cycles, a
machine learning model has been constructed to predict the occurrence of flares
in the corresponding active region within a certain time window. The Support
Vector Classifier, a widely used general classifier, is applied to build and
test the prediction models. Several classical verification measures are adopted
to assess the quality of the predictions. We investigate different flare levels
within various time windows, and thus it is possible to estimate the rough
classes and erupting times of flares for particular active regions. Several
combinations of predictors have been tested in the experiments. The True Skill
Statistics are higher than 0.36 in 97% of cases and the Heidke Skill Scores
range from 0.23 to 0.48. The predictors derived from longitudinal magnetic
fields do perform well, however they are less sensitive in predicting large
flares. Employing the nonpotentiality predictors from vector fields improves
the performance of predicting large flares of magnitude $\geq$M5.0 and
$\geq$X1.0.

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The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
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The categories of this paper are: patt-sol
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The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph