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High-frequency waves in chromospheric spicules

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Bate, W., Jess, D. B., Nakariakov, V. M., Grant, S. D. T., Jafarzadeh, S., Stangalini, M., Keys, P. H., Christian, D. J. and Keenan, F. P. (2022) High-frequency waves in chromospheric spicules. The Astrophysical Journal, 930 (2). 129. doi:10.3847/1538-4357/ac5c53 ISSN 0004-637X.

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Official URL: https://doi.org/10.3847/1538-4357/ac5c53

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Abstract

Using high-cadence observations from the Hydrogen-alpha Rapid Dynamics camera imaging system on the Dunn Solar Telescope, we present an investigation of the statistical properties of transverse oscillations in spicules captured above the solar limb. At five equally separated atmospheric heights, spanning approximately 4900–7500 km, we have detected a total of 15,959 individual wave events, with a mean displacement amplitude of 151 ± 124 km, a mean period of 54 ± 45 s, and a mean projected velocity amplitude of 21 ± 13 km s−1. We find that both the displacement and velocity amplitudes increase with height above the solar limb, ranging from 132 ± 111 km and 17.7 ± 10.6 km s−1 at ≈4900 km, and 168 ± 125 km and 26.3 ± 14.1 km s−1 at ≈7500 km, respectively. Following the examination of neighboring oscillations in time and space, we find 45% of the waves to be upwardly propagating, 49% to be downwardly propagating, and 6% to be standing, with mean absolute phase velocities for the propagating waves on the order of 75–150 km s−1. While the energy flux of the waves propagating downwards does not appear to depend on height, we find the energy flux of the upwardly propagating waves decreases with atmospheric height at a rate of −13,200 ± 6500 W m−2/Mm. As a result, this decrease in energy flux as the waves propagate upwards may provide significant thermal input into the local plasma.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Solar chromosphere, Solar flares, Astrophysics, Astronomy -- Observations, Solar atmosphere
Journal or Publication Title: The Astrophysical Journal
Publisher: Institute of Physics Publishing, Inc.
ISSN: 0004-637X
Official Date: 11 May 2022
Dates:
DateEvent
11 May 2022Published
8 March 2022Accepted
Volume: 930
Number: 2
Article Number: 129
DOI: 10.3847/1538-4357/ac5c53
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 9 June 2022
Date of first compliant Open Access: 9 June 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
RPG-2019-371Leverhulme Trusthttp://dx.doi.org/10.13039/501100000275
059RDEN-1Randox Laboratories Ltdhttp://viaf.org/viaf/5450165139007600560004
ST/T00021X/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
SSc-009UK Space Agencyhttp://dx.doi.org/10.13039/100011690
ST/T000252/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
18-29-21016[RFBR]Russian Foundation for Basic Researchhttp://dx.doi.org/10.13039/501100002261
682462[ERC] Horizon 2020 Framework Programmehttp://dx.doi.org/10.13039/100010661
262622Norges ForskningsrådUNSPECIFIED
Hooke18b/SCTM[RS] Royal Societyhttp://dx.doi.org/10.13039/501100000288

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