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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Online Access: | http://hdl.handle.net/10566/7539 https://doi.org/10.1029/2021JA030157 |
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ftunivwesterncrr:oai:repository.uwc.ac.za:10566/7539 2023-05-15T13:36:53+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 Kosch, Michael J. Hiyadutuje, Alicreance Stephenson, Judy A. E. 2022 application/pdf http://hdl.handle.net/10566/7539 https://doi.org/10.1029/2021JA030157 en_US eng Journal of Geophysical Research: Space Physics Hiyadutuje, A., Kosch, M. J., & Stephenson, J. 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, e2021JA030157. https://doi.org/10.1029/2021JA030157 https://doi.org/10.1029/2021JA030157 http://hdl.handle.net/10566/7539 SuperDARN HF TID-modulated NREs Gradient Drift Instability NRE amplitudes Article 2022 ftunivwesterncrr https://doi.org/10.1029/2021JA030157 2022-07-05T00:18:28Z 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 an 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 University of the Western Cap: UWC Research Repository 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 |
institution |
Open Polar |
collection |
University of the Western Cap: UWC Research Repository |
op_collection_id |
ftunivwesterncrr |
language |
English |
topic |
SuperDARN HF TID-modulated NREs Gradient Drift Instability NRE amplitudes |
spellingShingle |
SuperDARN HF TID-modulated NREs Gradient Drift Instability NRE amplitudes Kosch, Michael J. Hiyadutuje, Alicreance 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 |
topic_facet |
SuperDARN HF TID-modulated NREs Gradient Drift Instability NRE amplitudes |
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 an 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 |
Kosch, Michael J. Hiyadutuje, Alicreance Stephenson, Judy A. E. |
author_facet |
Kosch, Michael J. Hiyadutuje, Alicreance Stephenson, Judy A. E. |
author_sort |
Kosch, Michael J. |
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 |
publisher |
Journal of Geophysical Research: Space Physics |
publishDate |
2022 |
url |
http://hdl.handle.net/10566/7539 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, A., Kosch, M. J., & Stephenson, J. 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, e2021JA030157. https://doi.org/10.1029/2021JA030157 https://doi.org/10.1029/2021JA030157 http://hdl.handle.net/10566/7539 |
op_doi |
https://doi.org/10.1029/2021JA030157 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
127 |
container_issue |
5 |
_version_ |
1766085218837463040 |