Detection of a Magnetic Discontinuity in the Upper Solar Chromosphere Associated with a Coronal Loop Brightening Observed by CLASP2.1

Song, Donguk; Ishikawa, Ryohko; McKenzie, David E.; Trujillo Bueno, Javier; Auchère, Frédéric; Kano, Ryouhei; Winebarger, Amy; Okamoto, Takenori J.; Rachmeler, Laurel A.; Kobayashi, Ken; Vigil, Genevieve D.; Kobelski, Adam R.; Bethge, Christian; Lim, Eun-Kyung; Belluzzi, Luca; Alsina Ballester, Ernest; del Pino Alemán, Tanausú; Štěpán, Jiří

doi:10.3847/1538-4357/ad94f6

i

Detection of a Magnetic Discontinuity in the Upper Solar Chromosphere Associated with a Coronal Loop Brightening Observed by CLASP2.1

2025
By Song, Donguk ; Ishikawa, Ryohko ; McKenzie, David E. ; ...

Details

Journal Title:

The Astrophysical Journal
Personal Author:

Song, Donguk ; Ishikawa, Ryohko ; McKenzie, David E. ; Trujillo Bueno, Javier ; Auchère, Frédéric ; Kano, Ryouhei ; Winebarger, Amy ; Okamoto, Takenori J. ; Rachmeler, Laurel A. ; Kobayashi, Ken ; Vigil, Genevieve D. ; Kobelski, Adam R. ; Bethge, Christian ; Lim, Eun-Kyung ; Belluzzi, Luca ; Alsina Ballester, Ernest ; del Pino Alemán, Tanausú ; Štěpán, Jiří
NOAA Program & Office:

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

We report the first detection of a magnetic discontinuity in the upper solar chromosphere associated with a coronal loop brightening. Our findings are based on novel observations obtained by the Chromospheric LAyer SpectroPolarimeter (CLASP2.1) suborbital space experiment. During its short 6 minute flight, CLASP2.1 successfully obtained spectropolarimetric data across the Mg ii h and k lines, which allowed us to map the longitudinal magnetic field at multiple heights in the chromosphere of a solar active region. During our observation, we found a coronal loop brightening that was intermittently and recurrently heated. The temperature of the brightening plasma is above 2.5 MK, which is higher than the ambient temperature, and no corresponding brightening is detected in the images of the photosphere and lower chromosphere. The notable finding of our study is that the coronal loop brightening of interest is observed across a region where the magnetic field polarity changes abruptly in the upper chromosphere. Our results provide observational evidence that the heating mechanism of the coronal loop brightening is consistent with magnetic reconnection in the upper solar chromosphere.
Source:

The Astrophysical Journal, 978(2), 140
DOI:

https://doi.org/10.3847/1538-4357/ad94f6
ISSN:

0004-637X ; 1538-4357
Format:

PDF
Publisher:

American Astronomical Society
Document Type:

Journal Article
License:

https://creativecommons.org/licenses/by/4.0/
Rights Information:

CC BY
Compliance:

Submitted
Main Document Checksum:

urn:sha-512:50406c1682905e0f6bf3ea6f947319234484ed9522932ce3ca7378be1c4f8b95c892d67572bd0695f86ce243f926238dd6cf8a3194fc5d7fb79e86be9af81f0e
Download URL:

https://repository.library.noaa.gov/view/noaa/71020/noaa_71020_DS1.pdf
File Type:

[PDF - 1.93 MB ]

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