First observations of E‐region Near Range Echoes partially modulated by F‐region Traveling Ionospheric Disturbances observed by the same SuperDARN HF radar
We present the first observations from SuperDARN HF radar data of E-region Near Range Echoes (NREs) whose amplitudes are partially modulated by Medium-Scale Traveling Ionospheric Disturbances (MSTIDs) propagating in the F-region overhead that have been observed by the same radar in the far ranges. S...
Published in: | Journal of Geophysical Research: Space Physics |
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2022
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Online Access: | https://eprints.lancs.ac.uk/id/eprint/170139/ https://doi.org/10.1029/2021ja030157 |
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ftulancaster:oai:eprints.lancs.ac.uk:170139 2023-08-27T04:06:16+02:00 First observations of E‐region Near Range Echoes partially modulated by F‐region Traveling Ionospheric Disturbances observed by the same SuperDARN HF radar HIYADUTUJE, Alicreance Kosch, Michael J. Stephenson, Judy A.E. 2022-05-31 https://eprints.lancs.ac.uk/id/eprint/170139/ https://doi.org/10.1029/2021ja030157 unknown HIYADUTUJE, Alicreance and Kosch, Michael J. and Stephenson, Judy A.E. (2022) First observations of E‐region Near Range Echoes partially modulated by F‐region Traveling Ionospheric Disturbances observed by the same SuperDARN HF radar. Journal of Geophysical Research: Space Physics, 127 (5). ISSN 2169-9380 Journal Article PeerReviewed 2022 ftulancaster https://doi.org/10.1029/2021ja030157 2023-08-03T22:41:28Z We present the first observations from SuperDARN HF radar data of E-region Near Range Echoes (NREs) whose amplitudes are partially modulated by Medium-Scale Traveling Ionospheric Disturbances (MSTIDs) propagating in the F-region overhead that have been observed by the same radar in the far ranges. SuperDARN NREs occur normally ∼180-315 km downrange from the radar at ∼95-125 km altitude. Selected observations of TID-modulated NREs are presented from SANAE and Zhongshan Antarctic SuperDARN radars for both summer and winter seasons as well as geomagnetic active and quiet times. We show that the most likely mechanism is partial modulation of the Gradient Drift Instability (GDI), which is responsible for producing the NREs. GDI is driven by the velocity difference between neutrals and ions and may appear in the E-region ionosphere wherever suitable plasma density gradients exist. GDI already present in the E-region can be partially modulated by a MSTID passing overhead in the F-region via the additional MSTID polarization electric field mapped down in altitude along the equipotential magnetic field lines, thereby partially modulating the NRE amplitudes as observed. Article in Journal/Newspaper Antarc* Antarctic Lancaster University: Lancaster Eprints Antarctic SANAE ENVELOPE(-2.850,-2.850,-71.667,-71.667) Zhongshan ENVELOPE(76.371,76.371,-69.373,-69.373) Journal of Geophysical Research: Space Physics 127 5 |
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Open Polar |
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Lancaster University: Lancaster Eprints |
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ftulancaster |
language |
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description |
We present the first observations from SuperDARN HF radar data of E-region Near Range Echoes (NREs) whose amplitudes are partially modulated by Medium-Scale Traveling Ionospheric Disturbances (MSTIDs) propagating in the F-region overhead that have been observed by the same radar in the far ranges. SuperDARN NREs occur normally ∼180-315 km downrange from the radar at ∼95-125 km altitude. Selected observations of TID-modulated NREs are presented from SANAE and Zhongshan Antarctic SuperDARN radars for both summer and winter seasons as well as geomagnetic active and quiet times. We show that the most likely mechanism is partial modulation of the Gradient Drift Instability (GDI), which is responsible for producing the NREs. GDI is driven by the velocity difference between neutrals and ions and may appear in the E-region ionosphere wherever suitable plasma density gradients exist. GDI already present in the E-region can be partially modulated by a MSTID passing overhead in the F-region via the additional MSTID polarization electric field mapped down in altitude along the equipotential magnetic field lines, thereby partially modulating the NRE amplitudes as observed. |
format |
Article in Journal/Newspaper |
author |
HIYADUTUJE, Alicreance Kosch, Michael J. Stephenson, Judy A.E. |
spellingShingle |
HIYADUTUJE, Alicreance Kosch, Michael J. Stephenson, Judy A.E. First observations of E‐region Near Range Echoes partially modulated by F‐region Traveling Ionospheric Disturbances observed by the same SuperDARN HF radar |
author_facet |
HIYADUTUJE, Alicreance Kosch, Michael J. Stephenson, Judy A.E. |
author_sort |
HIYADUTUJE, Alicreance |
title |
First observations of E‐region Near Range Echoes partially modulated by F‐region Traveling Ionospheric Disturbances observed by the same SuperDARN HF radar |
title_short |
First observations of E‐region Near Range Echoes partially modulated by F‐region Traveling Ionospheric Disturbances observed by the same SuperDARN HF radar |
title_full |
First observations of E‐region Near Range Echoes partially modulated by F‐region Traveling Ionospheric Disturbances observed by the same SuperDARN HF radar |
title_fullStr |
First observations of E‐region Near Range Echoes partially modulated by F‐region Traveling Ionospheric Disturbances observed by the same SuperDARN HF radar |
title_full_unstemmed |
First observations of E‐region Near Range Echoes partially modulated by F‐region Traveling Ionospheric Disturbances observed by the same SuperDARN HF radar |
title_sort |
first observations of e‐region near range echoes partially modulated by f‐region traveling ionospheric disturbances observed by the same superdarn hf radar |
publishDate |
2022 |
url |
https://eprints.lancs.ac.uk/id/eprint/170139/ https://doi.org/10.1029/2021ja030157 |
long_lat |
ENVELOPE(-2.850,-2.850,-71.667,-71.667) ENVELOPE(76.371,76.371,-69.373,-69.373) |
geographic |
Antarctic SANAE Zhongshan |
geographic_facet |
Antarctic SANAE Zhongshan |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
HIYADUTUJE, Alicreance and Kosch, Michael J. and Stephenson, Judy A.E. (2022) First observations of E‐region Near Range Echoes partially modulated by F‐region Traveling Ionospheric Disturbances observed by the same SuperDARN HF radar. Journal of Geophysical Research: Space Physics, 127 (5). ISSN 2169-9380 |
op_doi |
https://doi.org/10.1029/2021ja030157 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
127 |
container_issue |
5 |
_version_ |
1775347065765756928 |