The Drivers of Active Region Outflows into the Slow Solar Wind

Brooks, David H., Winebarger, Amy R., Savage, Sabrina, Warren, Harry P., De Pontieu, Bart, Peter, Hardi, Cirtain, Jonathan W., Golub, Leon, Kobayashi, Ken, McIntosh, Scott W., McKenzie, David, Morton, Richard, Rachmeler, Laurel, Testa, Paola, Tiwari, Sanjiv and Walsh, Robert (2020) The Drivers of Active Region Outflows into the Slow Solar Wind. The Astrophysical Journal, 894 (2). p. 144. ISSN 1538-4357

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Official URL: https://doi.org/10.3847/1538-4357/ab8a4c

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.

Item Type: Article
Subjects: G900 Others in Mathematical and Computing Sciences
H300 Mechanical Engineering
H400 Aerospace Engineering
H600 Electronic and Electrical Engineering
H900 Others in Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 01 Jul 2020 08:58
Last Modified: 01 Jul 2020 08:58
URI: http://nrl.northumbria.ac.uk/id/eprint/43628

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