Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Statistical Comparison between Photospheric Vector Magnetograms
  Obtained by SDO/HMI and Hinode/SP   Since May 1, 2010, we have been able to study (almost) continuously the
vector magnetic field in the Sun, thanks to two space-based observatories: the
Solar Dynamics Observatory (SDO) and Hinode. Both are equipped with instruments
able to measure the Stokes parameters of Zeeman-induced polarization of
photospheric line radiation. But the observation modes, the spectral lines, the
spatial, spectral and temporal sampling, and even the inversion codes used to
recover magnetic and thermodynamic information from the Stokes profiles are
different. We compare the vector magnetic fields derived from observations with
the HMI instrument on board SDO, with those observed by the SP instrument on
Hinode. We have obtained relationships between components of magnetic vectors
in the umbra, penumbra and plage observed in 14 maps of NOAA AR 11084.
Importantly, we have transformed SP data into observables comparable to those
of HMI, to explore possible influences of the different modes of operation of
the two instruments, and the inversion schemes used to infer the magnetic
fields. The assumed filling factor (fraction of each pixel containing a Zeeman
signature) produces the most significant differences in derived magnetic
properties, especially in the plage. The spectral and angular samplings have
the next largest effects. We suggest to treat the disambiguation in the same
way in the data provided by HMI and SP. That would make the relationship
between the vector magnetic field recovered from these data stronger, what
would favor the simultaneous or complementary use of both instruments.

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The categories of this paper are: supr-con
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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: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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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: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an