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Slow magnetoacoustic oscillations in stellar coronal loops

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Lim, Daye, Nakariakov, Valery M. and Moon, Yong-Jae (2022) Slow magnetoacoustic oscillations in stellar coronal loops. The Astrophysical Journal, 931 (1). p. 63. doi:10.3847/1538-4357/ac69d8 ISSN 0004-637X.

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Official URL: http://dx.doi.org/10.3847/1538-4357/ac69d8

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Abstract

Slow magnetoacoustic oscillations in stellar coronal loops with gravitational stratification are analyzed with a numerical solution of the boundary value problem for eigenvalues and eigenfunctions. In this study, we only focus on the resonant periods. The effects of the gravitational stratification, star mass, loop temperature, and loop length on the properties of slow magnetoacoustic oscillations are investigated. It is shown that the discrepancy between stratified and nonstratified loops is higher in density perturbations than in velocity perturbations. When the star has a larger mass, higher coronal temperature, and longer loop, the density perturbations in the stratified loop are significantly different from the harmonic functions. The periods in the stratified loop are slightly longer than in the nonstratified loop. The periods calculated in our model (14–644 minutes) are consistent with the periods of stellar quasi-periodic pulsations observed in both soft X-rays (2–70 minutes) and white lights (8–390 minutes).

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 flares -- Magnetic fields, Solar cycle, Astrophysics, Magnetohydrodynamics, Sun -- Corona, Sun -- Temperature
Journal or Publication Title: The Astrophysical Journal
Publisher: Institute of Physics Publishing, Inc.
ISSN: 0004-637X
Official Date: 25 May 2022
Dates:
DateEvent
25 May 2022Published
21 April 2022Accepted
3 January 2022Submitted
Volume: 931
Number: 1
Page Range: p. 63
DOI: 10.3847/1538-4357/ac69d8
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 28 June 2022
Date of first compliant Open Access: 28 June 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDNational Research Foundationhttp://dx.doi.org/10.13039/501100001321
NRF-2021R1I1A1A01040372Ministry of Educationhttp://dx.doi.org/10.13039/501100002701
ST/T000252/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
2022-1-850-05Korea Astronomy and Space Science Institutehttp://dx.doi.org/10.13039/501100003717

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