Coronagraphic Observations of Si x 1430 nm Acquired by DKIST/Cryo-NIRSP with Methods for Telluric Absorption Correction

Schad, Thomas A.; Fehlmann, Andre; Dima, Gabriel I.; Kuhn, Jeffrey R.; Scholl, Isabelle F.; Harrington, David; Rimmele, Thomas; Tritschler, Alexandra; Paraschiv, Alin R.

doi:10.3847/1538-4357/ad2995

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

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Coronagraphic Observations of Si x 1430 nm Acquired by DKIST/Cryo-NIRSP with Methods for Telluric Absorption Correction

2024
By Schad, Thomas A. ; Fehlmann, Andre ; Dima, Gabriel I. ; ...
Source: The Astrophysical Journal, 965(1), 40

[PDF-3.87 MB]

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Journal Title:

The Astrophysical Journal
Personal Author:

Schad, Thomas A. ; Fehlmann, Andre ; Dima, Gabriel I. ; Kuhn, Jeffrey R. ; Scholl, Isabelle F. ; ... More +

Schad, Thomas A. ; Fehlmann, Andre ; Dima, Gabriel I. ; Kuhn, Jeffrey R. ; Scholl, Isabelle F. ; Harrington, David ; Rimmele, Thomas ; Tritschler, Alexandra ; Paraschiv, Alin R. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; NESDIS (National Environmental Satellite, Data, and Information Service) ; NCEI (National Centers for Environmental Information)

OAR (Oceanic and Atmospheric Research) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; NESDIS (National Environmental Satellite, Data, and Information Service) ; NCEI (National Centers for Environmental Information) Less -
Description:

We report commissioning observations of the Si x 1430 nm solar coronal line observed coronagraphically with the Cryogenic Near-Infrared Spectropolarimeter at the National Science Foundation’s Daniel K. Inouye Solar Telescope. These are the first known spatially resolved observations of this spectral line, which has strong potential as a coronal magnetic field diagnostic. The observations target a complex active region located on the solar northeast limb on 2022 March 4. We present a first analysis of these data that extracts the spectral line properties through a careful treatment of the variable atmospheric transmission that is known to impact this spectral window. Rastered images are created and compared with extreme-UV observations from the Solar Dynamics Observatory (SDO) Atmospheric Imaging Assembly (AIA) instrument. A method for estimating the electron density from the Si x observations is then demonstrated that makes use of the forbidden line density-sensitive emissivity and an emission-measure analysis of the SDO/AIA bandpass observations. In addition, we derive an effective temperature and nonthermal line width across the region. This study informs the calibration approaches required for more routine observations of this promising diagnostic line.
Keywords:

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Remote Sensing Solar Oscillation
Source:

The Astrophysical Journal, 965(1), 40
DOI:

https://doi.org/10.3847/1538-4357/ad2995
ISSN:

0004-637X;1538-4357;
Format:

PDF
Publisher:

American Astronomical Society
Document Type:

Journal Article
Funding:

Grant no. NA17OAR4320101 ; Grant no. NA22OAR4320151

Grant no. NA17OAR4320101 ; Grant no. NA22OAR4320151 Less -
License:

https://creativecommons.org/licenses/by/4.0/
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CC BY
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Submitted
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urn:sha-512:75a3a62c5db6acd682fb75f94cb9510b71ec6e2202727bdfdc105578a6390ce3893a93d9d3009e96288d8093fb3353f431f7db313edcfdc885ee33db97bfa46a
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https://repository.library.noaa.gov/view/noaa/66015/noaa_66015_DS1.pdf
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Coronagraphic Observations of Si x 1430 nm Acquired by DKIST/Cryo-NIRSP with Methods for Telluric Absorption Correction

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