PMSE long term observations using SuperDARN SANAE HF radar measurements
It is known that the presence of nanometre-scale ice particles and neutral air turbulence in the Polar summer mesosphere modify the D-region plasma, resulting in strong backscatter. These strong backscatters are referred to as Polar Mesosphere Summer Echoes (PMSE). Although studies on PMSE have been...
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ftnorthwestuniv:oai:repository.nwu.ac.za:10394/25582 2023-05-15T13:39:51+02:00 PMSE long term observations using SuperDARN SANAE HF radar measurements Ogunjobi, Olankunle Sivakumar, Venkataraman Stephenson, Judy Ann Elizabeth Mtumela, Zolile 27840220 - Ogunjobi, Olankunle 2017 application/pdf http://hdl.handle.net/10394/25582 https://doi.org/10.3319/TAO.2016.09.19.01 http://tao.cgu.org.tw/index.php/articles/archive/space-science/item/1501-2016091901aa en eng TAO Ogunjobi, O. et al. 2017. PMSE long term observations using SuperDARN SANAE HF radar measurements. Terrestrial, atmospheric and oceanic sciences, 28(3):371-383. [http://dx.doi.org/10.3319/TAO.2016.09.19.01] 1017-0839 (Online) http://hdl.handle.net/10394/25582 http://dx.doi.org/10.3319/TAO.2016.09.19.01 http://tao.cgu.org.tw/index.php/articles/archive/space-science/item/1501-2016091901aa SuperDARN SANAE radar PMSE Mesosphere Article 2017 ftnorthwestuniv https://doi.org/10.3319/TAO.2016.09.19.01 2020-11-17T01:01:48Z It is known that the presence of nanometre-scale ice particles and neutral air turbulence in the Polar summer mesosphere modify the D-region plasma, resulting in strong backscatter. These strong backscatters are referred to as Polar Mesosphere Summer Echoes (PMSE). Although studies on PMSE have been ongoing for over three decades, aspects revealed by various instruments are still the subject of discussion. As a sequel to the paper by Ogunjobi et al. (2015), we report on the long term trends and variations in PMSE occurrence probability from Super Dual Auroral Radar Network (SuperDARN) high frequency (HF) radar measurements over the South African National Antarctic Expedition IV (SANAE IV). In this current paper, a simple multiple-filter technique is employed to obtain the occurrence probability rate for SuperDARN-PMSE during the summer periods for the years 1998 - 2007. The SuperDARN-PMSE occurrence probability rate in relation to geomagnetic activity is examined. The mesospheric neutral winds and temperature trends during these periods, are further studied and presented in this paper. Both the monthly and diurnal variations in occurrence are consistent with previous reports, confirming the presence of PMSE from SuperDARN SANAE IV radar measurements and the influence of pole to pole mesospheric transport circulation. The special mesospheric mean flow observed prior to the year 2002 is ascribed to the influence of solar activity. The SuperDARN-PMSE occurrence probability peaks with lowered geomagnetic activity. These present results support the hypothesis that the particle precipitation also plays an important role in SuperDARN-PMSE occurrence Article in Journal/Newspaper Antarc* Antarctic North-West University, South Africa: Boloka (NWU-IR) Antarctic SANAE ENVELOPE(-2.850,-2.850,-71.667,-71.667) SANAE IV ENVELOPE(-2.850,-2.850,-71.667,-71.667) Terrestrial, Atmospheric and Oceanic Sciences 28 3 371 383 |
institution |
Open Polar |
collection |
North-West University, South Africa: Boloka (NWU-IR) |
op_collection_id |
ftnorthwestuniv |
language |
English |
topic |
SuperDARN SANAE radar PMSE Mesosphere |
spellingShingle |
SuperDARN SANAE radar PMSE Mesosphere Ogunjobi, Olankunle Sivakumar, Venkataraman Stephenson, Judy Ann Elizabeth Mtumela, Zolile PMSE long term observations using SuperDARN SANAE HF radar measurements |
topic_facet |
SuperDARN SANAE radar PMSE Mesosphere |
description |
It is known that the presence of nanometre-scale ice particles and neutral air turbulence in the Polar summer mesosphere modify the D-region plasma, resulting in strong backscatter. These strong backscatters are referred to as Polar Mesosphere Summer Echoes (PMSE). Although studies on PMSE have been ongoing for over three decades, aspects revealed by various instruments are still the subject of discussion. As a sequel to the paper by Ogunjobi et al. (2015), we report on the long term trends and variations in PMSE occurrence probability from Super Dual Auroral Radar Network (SuperDARN) high frequency (HF) radar measurements over the South African National Antarctic Expedition IV (SANAE IV). In this current paper, a simple multiple-filter technique is employed to obtain the occurrence probability rate for SuperDARN-PMSE during the summer periods for the years 1998 - 2007. The SuperDARN-PMSE occurrence probability rate in relation to geomagnetic activity is examined. The mesospheric neutral winds and temperature trends during these periods, are further studied and presented in this paper. Both the monthly and diurnal variations in occurrence are consistent with previous reports, confirming the presence of PMSE from SuperDARN SANAE IV radar measurements and the influence of pole to pole mesospheric transport circulation. The special mesospheric mean flow observed prior to the year 2002 is ascribed to the influence of solar activity. The SuperDARN-PMSE occurrence probability peaks with lowered geomagnetic activity. These present results support the hypothesis that the particle precipitation also plays an important role in SuperDARN-PMSE occurrence |
author2 |
27840220 - Ogunjobi, Olankunle |
format |
Article in Journal/Newspaper |
author |
Ogunjobi, Olankunle Sivakumar, Venkataraman Stephenson, Judy Ann Elizabeth Mtumela, Zolile |
author_facet |
Ogunjobi, Olankunle Sivakumar, Venkataraman Stephenson, Judy Ann Elizabeth Mtumela, Zolile |
author_sort |
Ogunjobi, Olankunle |
title |
PMSE long term observations using SuperDARN SANAE HF radar measurements |
title_short |
PMSE long term observations using SuperDARN SANAE HF radar measurements |
title_full |
PMSE long term observations using SuperDARN SANAE HF radar measurements |
title_fullStr |
PMSE long term observations using SuperDARN SANAE HF radar measurements |
title_full_unstemmed |
PMSE long term observations using SuperDARN SANAE HF radar measurements |
title_sort |
pmse long term observations using superdarn sanae hf radar measurements |
publisher |
TAO |
publishDate |
2017 |
url |
http://hdl.handle.net/10394/25582 https://doi.org/10.3319/TAO.2016.09.19.01 http://tao.cgu.org.tw/index.php/articles/archive/space-science/item/1501-2016091901aa |
long_lat |
ENVELOPE(-2.850,-2.850,-71.667,-71.667) ENVELOPE(-2.850,-2.850,-71.667,-71.667) |
geographic |
Antarctic SANAE SANAE IV |
geographic_facet |
Antarctic SANAE SANAE IV |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Ogunjobi, O. et al. 2017. PMSE long term observations using SuperDARN SANAE HF radar measurements. Terrestrial, atmospheric and oceanic sciences, 28(3):371-383. [http://dx.doi.org/10.3319/TAO.2016.09.19.01] 1017-0839 (Online) http://hdl.handle.net/10394/25582 http://dx.doi.org/10.3319/TAO.2016.09.19.01 http://tao.cgu.org.tw/index.php/articles/archive/space-science/item/1501-2016091901aa |
op_doi |
https://doi.org/10.3319/TAO.2016.09.19.01 |
container_title |
Terrestrial, Atmospheric and Oceanic Sciences |
container_volume |
28 |
container_issue |
3 |
container_start_page |
371 |
op_container_end_page |
383 |
_version_ |
1766125482349166592 |