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Seismological determination of the Alfv en speed and plasma-beta in solar photospheric bright points

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Cho, Il-Hyun, Moon, Yong-Jae, Nakariakov, V. M. (Valery M.), Yu, Dae Jung, Lee, Jin-Yi, Bong, Su-Chan, Kim, Rok-Soon, Cho, Kyung-Suk, Kim, Yeon-Han and Lee, Jae-Ok (2019) Seismological determination of the Alfv en speed and plasma-beta in solar photospheric bright points. Astrophysical Journal Letters, 871 (1). L14. doi:10.3847/2041-8213/aafe0a ISSN 2041-8213.

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Official URL: https://doi.org/10.3847/2041-8213/aafe0a

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Abstract

The Alfvén speed and plasma beta in photospheric bright points observed by the Broadband Filter Imager (BFI) of the Solar Optical Telescope (SOT) on board the Hinode satellite, are estimated seismologically. The diagnostics is based on the theory of slow magnetoacoustic waves in a non-isothermally stratified photosphere with a uniform vertical magnetic field. We identify and track bright points in a G-band movie by using the 3D region growing method, and align them with blue continuum images to derive their brightness temperatures. From the Fourier power spectra of 118 continuum light curves made in the bright points, we find that 91 oscillations are significantly distinguished from quiet regions, with the periods ranging 2.2–16.2 min. We find that the model gives a moderate value of the plasma beta when γ lies at around 5/3. The calculated Alfvén speed is 9.68±2.02 km s−1, ranging in6.3–17.4 km s−1.The plasma beta is estimated to be of 0.93±0.36, ranging in 0.2–1.9.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Solar photosphere, Solar oscillations, Sun -- Faculae
Journal or Publication Title: Astrophysical Journal Letters
Publisher: IOP Publishing Ltd
ISSN: 2041-8213
Official Date: 23 January 2019
Dates:
DateEvent
23 January 2019Published
11 January 2019Accepted
Volume: 871
Number: 1
Article Number: L14
DOI: 10.3847/2041-8213/aafe0a
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: © 2019. The American Astronomical Society. All rights reserved.
Date of first compliant deposit: 15 January 2019
Date of first compliant Open Access: 9 April 2019
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
NRF-2017R1A6A3A01002649National Research Foundation of Koreahttp://dx.doi.org/10.13039/501100003725
No. 2017-1-851-0Korea Astronomy and Space Science Institutehttp://dx.doi.org/10.13039/501100003717
NRF-2016R1A2B401313National Research Foundation of Koreahttp://dx.doi.org/10.13039/501100003725
NRF-2013M1A3A3A02042232National Research Foundation of Koreahttp://dx.doi.org/10.13039/501100003725
ST/P000320/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
NRF-2016R1A6A3A11932534National Research Foundation of Koreahttp://dx.doi.org/10.13039/501100003725
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