Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Flare Forecasting Algorithms Based on High-Gradient Polarity Inversion
  Lines in Active Regions   Solar flares emanate from solar active regions hosting complex and strong
bipolar magnetic fluxes. Estimating the probability of an active region to
flare and defining reliable precursors of intense flares is an extremely
challenging task in the space weather field. In this work, we focus on two
metrics as flare precursors, the unsigned flux R, tested on MDI/SOHO data and
one of the most used parameters for flare forecasting applications, and a novel
topological parameter D representing the complexity of a solar active region.
More in detail, we propose an algorithm for the computation of the R value
which exploits the higher spatial resolution of HMI maps. This algorithm leads
to a differently computed R value, whose functionality is tested on a set of
cycle 24th solar flares. Furthermore, we introduce a topological parameter
based on the automatic recognition of magnetic polarity-inversion lines in
identified active regions, and able to evaluate its magnetic topological
complexity. We use both a heuristic approach and a supervised machine learning
method to validate the effectiveness of these two descriptors to predict the
occurrence of X- or M- class flares in a given solar active region during the
following 24 hours period. Our feature ranking analysis shows that both
parameters play a significant role in prediction performances. Moreover, the
analysis demonstrates that the new topological parameter D is the only one,
among 173 overall predictors, which is always present for all test subsets and
is systematically ranked within the top-ten positions in all tests concerning
the computation of the weighs with which each predictor impacts the flare
forecasting.

11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph