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Accelerating and supersonic density fluctuations in coronal hole plumes : signature of nascent solar winds

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Cho, Il-Hyun, Nakariakov, V. M. (Valery M.), Moon, Yong-Jae, Lee, Jin-Yi, Yu, Dae Jung, Cho, Kyung-Suk, Yurchyshyn, Vasyl and Lee, Harim (2020) Accelerating and supersonic density fluctuations in coronal hole plumes : signature of nascent solar winds. Astrophysical Journal Letters . doi:10.3847/2041-8213/abb020 (In Press)

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Official URL: https://doi.org/10.3847/2041-8213/abb020

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Abstract

Slow magnetoacoustic waves in a static background provide a seismological tool to probe the solar atmosphere in the analytic frame. By analyzing the spatiotemporal variation of the electron number density of plume structure in coronal holes above the limb for a given temperature, we find that the density perturbations accelerate with supersonic speeds in the distance range from 1.02 to 1.23 solar radii. We interpret them as slow magnetoacoustic waves propagating at about the sound speed with accelerating subsonic flows. The average sonic height of the subsonic flows is calculated to be 1.27 solar radii. The mass flux of the subsonic flows is estimated to be 44.1% relative to the global solar wind. Hence, the subsonic flow is likely to be the nascent solar wind. In other words, the evolution of the nascent solar wind in plumes at the low corona is quantified for the first time from imaging observations. Based on the interpretation, propagating density perturbations present in plumes could be used as a seismological probe of the gradually accelerating solar wind.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Solar activity, Astrophysics, Astronomy, Solar wind, Magnetohydrodynamics
Journal or Publication Title: Astrophysical Journal Letters
Publisher: IOP Publishing Ltd
ISSN: 2041-8213
Official Date: 3 September 2020
Dates:
DateEvent
3 September 2020Available
17 August 2020Accepted
Date of first compliant deposit: 2 September 2020
DOI: 10.3847/2041-8213/abb020
Status: Peer Reviewed
Publication Status: In Press
Publisher Statement: This is an author-created, un-copyedited version of an article accepted for publication/published in Astrophysical Journal Letters. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at: https://doi.org/10.3847/2041-8213/abb020
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
ST/T000252/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
2020-1-850-07Han'guk Ch'ŏnmun Yŏn'guwŏnhttp://viaf.org/viaf/124568602
NRF-2020R1I1A0107814Hanʾguk Haksul Chinhŭng Chaedanhttp://viaf.org/viaf/136386243
NRF-2019R1C1C1006033Korea (South). Munʼgyobuhttp://viaf.org/viaf/126953857
NRF-2019R1C1C1004778Korea (South). Munʼgyobuhttp://viaf.org/viaf/126953857
NRF-2019R1A2C1002634Korea (South). Munʼgyobuhttp://viaf.org/viaf/126953857
UNSPECIFIEDInstitute for Information and Communication Technology PromotionUNSPECIFIED
2018-0-01422Government of South KoreaUNSPECIFIED
AST-1614457National Science Foundationhttp://dx.doi.org/10.13039/501100008982
FA9550-19-1-0040Air Force Office of Scientific Researchhttp://dx.doi.org/10.13039/100000181
NASA80NSSC17K0016Air Force Office of Scientific Researchhttp://dx.doi.org/10.13039/100000181
80NSSC19K0257Air Force Office of Scientific Researchhttp://dx.doi.org/10.13039/100000181
80NSSC20K0025Air Force Office of Scientific Researchhttp://dx.doi.org/10.13039/100000181
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