Near-Sun observations of an F-corona decrease and K-corona fine structure

[en] Remote observations of the solar photospheric light scattered by electrons (the K-corona) and dust (the F-corona or zodiacal light) have been made from the ground during eclipses1 and from space at distances as small as 0.3 astronomical units2–5 to the Sun. Previous observations6–8 of dust scattering have not confirmed the existence of the theoretically predicted dust-free zone near the Sun9–11. The transient nature of the corona has been well characterized for large events, but questions still remain (for example, about the initiation of the corona12 and the production of solar energetic particles13) and for small events even its structure is uncertain14. Here we report imaging of the solar corona15 during the first two perihelion passes (0.16–0.25 astronomical units) of the Parker Solar Probe spacecraft13, each lasting ten days. The view from these distances is qualitatively similar to the historical views from ground and space, but there are some notable differences. At short elongations, we observe a decrease in the intensity of the F-coronal intensity, which is suggestive of the long-sought dust free zone9–11. We also resolve the fine-scale plasma structure of very small eruptions, which are frequently ejected from the Sun. These take two forms: the frequently observed magnetic flux ropes12,16 and the predicted, but not yet observed, magnetic islands17,18 arising from the tearing-mode instability in the current sheet. Our observations of the coronal streamer evolution confirm the large-scale topology of the solar corona, but also reveal that, as recently predicted19, streamers are composed of yet smaller substreamers channelling continual density fluctuations at all visible scales. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Howard, Russell A.; US Naval Research Laboratory, Washington, DC, United States

Vourlidas, Angelos; Johns Hopkins University, Applied Physics Laboratory, Laurel, MD, United States

Bothmer, Volker; Institut für Astrophysik, University of Göttingen, Göttingen, Germany

Colaninno, Robin C.; US Naval Research Laboratory, Washington, DC, United States

DeForest, Craig E.; Southwest Research Institute, Boulder, CO, United States

Gallagher, B.; US Naval Research Laboratory, Washington, DC, United States

Hall, Jeffrey R.; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States

Hess, Phillip; US Naval Research Laboratory, Washington, DC, United States

Higginson, Aleida K.; Johns Hopkins University, Applied Physics Laboratory, Laurel, MD, United States

Korendyke, Clarence M.; US Naval Research Laboratory, Washington, DC, United States

More authors (16 more)

Language :

English

Title :

Near-Sun observations of an F-corona decrease and K-corona fine structure

Publication date :

2019

Journal title :

Nature

ISSN :

0028-0836

eISSN :

1476-4687

Publisher :

Nature Research

Volume :

576

Issue :

7786

Pages :

232-236

Peer reviewed :

Peer Reviewed verified by ORBi

Funders :

DLR - Division of Loan Repayment
CNES - Centre National d'�tudes Spatiales
DLR - Deutsches Zentrum f�r Luft- und Raumfahrt
ERC - European Research Council

Available on ORBi :

since 23 December 2019

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