Rights statement: 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
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Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - The dynamics of quasi-periodic ripples in the high-latitude F-region
AU - Birch, M.J.
AU - Hargreaves, J.K.
N1 - 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
PY - 2021/5/31
Y1 - 2021/5/31
N2 - 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.
AB - 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.
KW - EISCAT Svalbard radar
KW - Electron content fluctuations
KW - F-region circulation
KW - Bandpass filters
KW - Flow velocity
KW - Radar
KW - Scanning antennas
KW - Circular pattern
KW - Eiscat svalbard radars
KW - Fixed angles
KW - High Latitudes
KW - Line of Sight
KW - Long-term trend
KW - Noise components
KW - Quasi-periodic
KW - F region
U2 - 10.1016/j.jastp.2021.105536
DO - 10.1016/j.jastp.2021.105536
M3 - Journal article
VL - 216
JO - Journal of Atmospheric and Solar-Terrestrial Physics
JF - Journal of Atmospheric and Solar-Terrestrial Physics
SN - 1364-6826
M1 - 105536
ER -