Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tracing the Chromospheric and Coronal Magnetic Field with AIA, IRIS,
  IBIS, and ROSA Data   The aim of this study is to explore the suitability of chromospheric images
for magnetic modeling of active regions. We use high-resolution images (0.1")
from the Interferometric Bidimensional Spectrometer (IBIS) in the Ca II 8542 A
line, the Rapid Oscillations in the Solar Atmosphere (ROSA) instrument in the
H-alpha 6563 A line, the Interface Region Imaging Spectrograph (IRIS) in the
2796 A line, and compare non-potential magnetic field models obtained from
those chromospheric images with those obtained from images of the Atmospheric
Imaging Assembly (AIA) in coronal (171 A, etc.) and in chromospheric (304 A)
wavelengths. Curvi-linear structures are automatically traced in those images
with the OCCULT-2 code, to which we forward-fitted magnetic field lines
computed with the Vertical-Current Approximation Non-Linear Force Free Field
(VCA-NLFFF) code. We find that the chromospheric images: (1) reveal crisp
curvi-linear structures (fibrils, loop segments, spicules) that are extremely
well-suited for constraining magnetic modeling; (2) that these curvi-linear
structures are field-aligned with the best-fit solution by a median
misalignment angle of ~4-7 deg; (3) the free energy computed from coronal data
may underestimate that obtained from cromospheric data by a factor of ~ 2-4,
(4) the height range of chromospheric features is confined to h ~ 4000$ km,
while coronal features are detected up to h ~ 35,000$ km; and (5) the
plasma-beta parameter is beta ~ 10^(-5)-10^(-1) for all traced features. We
conclude that chromospheric images reveal important magnetic structures that
are complementary to coronal images and need to be included in comprehensive
magnetic field models, a quest that is not accomodated in standard NLFFF codes.

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The categories of this paper are: hep-th
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The categories of this paper are: cond-mat
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ph