Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chromospheric condensations and magnetic field in a C3.6-class flare
  studied via He I D3 spectro-polarimetry   Context. Magnetic reconnection during flares takes place in the corona but a
substantial part of flare energy is deposited in the chromosphere. However,
high-resolution spectro-polarimetric chromospheric observations of flares are
very rare. The most used observables are Ca II 8542 {\AA} and He I 10830 {\AA}.
Aims. We aim to study the chromosphere during a C3.6 class flare via
spectro-polarimetric observations of the He I D3 line. Methods. We present the
first SST/CRISP spectro-polarimetric observations of He I D3. We analyze the
data using the inversion code HAZEL, and estimate the LOS velocity and the
magnetic field vector. Results. Strong He I D3 emission at the flare
footpoints, as well as strong He I D3 absorption profiles tracing the flaring
loops are observed during the flare. The He I D3 traveling emission kernels at
the flare footpoints exhibit strong chromospheric condensations of up to $\sim$
60 km/s at their leading edge. Our observations suggest that such condensations
result in shocking the deep chromosphere, causing broad and modestly
blueshifted He I D3 profiles indicating subsequent upflows. A strong and rather
vertical magnetic field of up to $\sim$ 2500 G is measured in the flare
footpoints, confirming that the He I D3 line is likely formed in the deep
chromosphere at those locations. We provide chromospheric line-of-sight
velocity and magnetic field maps obtained via He I D3 inversions. We propose a
fan-spine configuration as the flare magnetic field topology. Conclusions. The
He I D3 line is an excellent diagnostic to study the chromosphere during
flares. The impact of strong condensations on the deep chromosphere has been
observed. Detailed maps of the flare dynamics and the magnetic field are
obtained.

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The categories of this paper are: hep-ex
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The categories of this paper are: math
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The categories of this paper are: alg-geom
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The categories of this paper are: adap-org
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-th
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The categories of this paper are: eess