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BOE, B. HABBAL, S. DRUCKMÜLLER, M.
Original Title
Coronal Magnetic Field Topology from Total Solar Eclipse Observations
Type
journal article in Web of Science
Language
English
Original Abstract
Measuring the global magnetic field of the solar corona remains exceptionally challenging. The fine-scale density structures observed in white-light images taken during total solar eclipses are currently the best proxies for inferring the magnetic field direction in the corona from the solar limb out to several solar radii (R). We present, for the first time, the topology of the coronal magnetic field continuously between 1 and 6 R, as quantitatively inferred with the rolling Hough transform for 14 unique eclipse coronae that span almost two complete solar cycles. We find that the direction of the coronal magnetic field does not become radial until at least 3 R, with a high variance between 1.5 and 3 R at different latitudes and phases of the solar cycle. We find that the most nonradial coronal field topologies occur above regions with weaker magnetic field strengths in the photosphere, while stronger photospheric fields are associated with highly radial field lines in the corona. In addition, we find an abundance of field lines that extend continuously from the solar surface out to several solar radii at all latitudes, regardless of the presence of coronal holes. These results have implications for testing and constraining coronal magnetic field models, and for linking in situ solar wind measurements to their sources at the Sun.
Keywords
Solar corona; Solar magnetic fields; Solar eclipses; Solar coronal plumes; Solar coronal streamers; Solar cycle; Solar coronal holes; Solar optical telescopes; Solar wind
Authors
BOE, B.; HABBAL, S.; DRUCKMÜLLER, M.
Released
3. 6. 2020
Publisher
IOP PUBLISHING LTD
Location
BRISTOL
ISBN
0004-637X
Periodical
ASTROPHYSICAL JOURNAL
Year of study
895
Number
2
State
United States of America
Pages from
123
Pages to
137
Pages count
14
URL
https://iopscience.iop.org/article/10.3847/1538-4357/ab8ae6/pdf
BibTex
@article{BUT164323, author="Benjamin {Boe} and Shadia Rifai {Habbal} and Miloslav {Druckmüller}", title="Coronal Magnetic Field Topology from Total Solar Eclipse Observations", journal="ASTROPHYSICAL JOURNAL", year="2020", volume="895", number="2", pages="123--137", doi="10.3847/1538-4357/ab8ae6", issn="0004-637X", url="https://iopscience.iop.org/article/10.3847/1538-4357/ab8ae6/pdf" }