Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heating signatures in the disk counterparts of solar spicules in IRIS
  observations   We use coordinated observations with the Interface Region Imaging
Spectrograph (IRIS) and the Swedish 1-m Solar Telescope (SST) to identify the
disk counterpart of type II spicules in upper-chromospheric and transition
region (TR) diagnostics. These disk counterparts were earlier identified
through short-lived asymmetries in chromospheric spectral lines: rapid blue- or
red-shifted excursions (RBEs or RREs). We find clear signatures of RBEs and
RREs in Mg II h & k, often with excursions of the central h3 and k3 absorption
features in concert with asymmetries in co-temporal and co-spatial H-alpha
spectral profiles. We find spectral signatures for RBEs and RREs in C II 1335
and 1336 A and Si IV 1394 and 1403 A spectral lines and interpret this as a
sign that type II spicules are heated to at least TR temperatures, supporting
other recent work. These C II and Si IV spectral signals are weaker for a
smaller network region than for more extended network regions in our data. A
number of bright features around extended network regions observed in IRIS
slit-jaw imagery SJI 1330 and 1400, recently identified as network jets, can be
clearly connected to H-alpha RBEs and/or RREs in our coordinated data. We
speculate that at least part of the diffuse halo around network regions in the
IRIS SJI 1330 and 1400 images can be attributed to type II spicules with
insufficient opacity in the C II and Si IV lines to stand out as single
features in these passbands.

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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: physics
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The categories of this paper are: cmp-lg