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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, 900 (2). L19. doi:10.3847/2041-8213/abb020
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WRAP-Accelerating-supersonic-density-fluctuations-coronal-hole-plumes-Nakariakov-2020.pdf - Accepted Version - Requires a PDF viewer. Download (2462Kb) | Preview |
Official URL: https://doi.org/10.3847/2041-8213/abb020
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 | ||||||||||||||||||||||||||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||||||||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > 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 | ||||||||||||||||||||||||||||||||||||||||||
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| Volume: | 900 | ||||||||||||||||||||||||||||||||||||||||||
| Number: | 2 | ||||||||||||||||||||||||||||||||||||||||||
| Article Number: | L19 | ||||||||||||||||||||||||||||||||||||||||||
| DOI: | 10.3847/2041-8213/abb020 | ||||||||||||||||||||||||||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||||||||||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||||||||||||||||||||||||||
| Reuse Statement (publisher, data, author rights): | 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 | ||||||||||||||||||||||||||||||||||||||||||
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