The dynamics of quasi-periodic ripples in the high-latitude F-region

Birch, M.J. and Hargreaves, J.K. (2021) The dynamics of quasi-periodic ripples in the high-latitude F-region. Journal of Atmospheric and Solar-Terrestrial Physics, 216. ISSN 1364-6826

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Abstract

This study extends the investigation of quasi-periodic ripples in the F-region electron content reported by Birch and Hargreaves (2020a) to determine their flow velocity and wavelength, using data from the EISCAT Svalbard radars (the 42m antenna being field-aligned and the 32m scanning in a circular pattern at a fixed angle from the field). The ripples were extracted from the 42m electron content between altitudes 213 and 389 km in the noon and midnight sectors using a bandpass filter which reduces the noise component while removing long-term trends. These ripples were found to have an average periodicity of about 21 min in the noon sector and 27 min at night. Using the 32m line-of-sight velocity data, they were also found to propagate in the noon sector at about 467 m/s in a westerly direction with a wavelength of 581 km, and in the night sector at about 283 m/s in a southerly direction with a wavelength of 454 km. The directions compare favourably with modelled plasma flows from the SuperDARN network of coherent scatter radars.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Atmospheric and Solar-Terrestrial Physics
Additional Information:
This is the author’s version of a work that was accepted for publication in Journal of Atmospheric and Solar-Terrestrial Physics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Atmospheric and Solar-Terrestrial Physics, 216, 2021 DOI: 10.1016/j.jastp.2021.105536
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1912
Subjects:
ID Code:
154586
Deposited By:
Deposited On:
04 May 2021 15:30
Refereed?:
Yes
Published?:
Published
Last Modified:
31 May 2021 03:05