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  The Drivers of Active Region Outflows into the Slow Solar Wind

Brooks, D. H., Winebarger, A. R., Savage, S., Warren, H. P., Pontieu, B. D., Peter, H., et al. (2020). The Drivers of Active Region Outflows into the Slow Solar Wind. The Astrophysical Journal, 894(2): 144. doi:10.3847/1538-4357/ab8a4c.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-9730-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-9731-8
Genre: Journal Article

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 Creators:
Brooks, David H., Author
Winebarger, Amy R., Author
Savage, Sabrina, Author
Warren, Harry P., Author
Pontieu, Bart De, Author
Peter, Hardi1, Author              
Cirtain, Jonathan W., Author
Golub, Leon, Author
Kobayashi, Ken, Author
McIntosh, Scott W., Author
McKenzie, David, Author
Morton, Richard, Author
Rachmeler, Laurel, Author
Testa, Paola, Author
Tiwari, Sanjiv, Author
Walsh, Robert, Author
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              

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 Abstract: Plasma outflows from the edges of active regions have been suggested as a possible source of the slow solar wind. Spectroscopic measurements show that these outflows have an enhanced elemental composition, which is a distinct signature of the slow wind. Current spectroscopic observations, however, do not have sufficient spatial resolution to distinguish what structures are being measured or determine the driver of the outflows. The High-resolution Coronal Imager (Hi-C) flew on a sounding rocket in 2018 May and observed areas of active region outflow at the highest spatial resolution ever achieved (250 km). Here we use the Hi-C data to disentangle the outflow composition signatures observed with the Hinode satellite during the flight. We show that there are two components to the outflow emission: a substantial contribution from expanded plasma that appears to have been expelled from closed loops in the active region core and a second contribution from dynamic activity in active region plage, with a composition signature that reflects solar photospheric abundances. The two competing drivers of the outflows may explain the variable composition of the slow solar wind.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.3847/1538-4357/ab8a4c
 Degree: -

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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 894 (2) Sequence Number: 144 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3