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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ftdoajarticles:oai:doaj.org/article:5d184dfa974f4114b2f1e15f9d813b32 2023-05-15T13:59:58+02:00 PMSE long term observations using SuperDARN SANAE HF radar measurements Olakunle Ogunjobi Venkataraman Sivakumar Judy Ann Elizabeth Stephenson Zolile Mtumela 2017-01-01T00:00:00Z https://doi.org/10.3319/TAO.2016.09.19.01 https://doaj.org/article/5d184dfa974f4114b2f1e15f9d813b32 EN eng Springer http://tao.cgu.org.tw/media/k2/attachments/v283p371.pdf https://doaj.org/toc/1017-0839 https://doaj.org/toc/2311-7680 1017-0839 2311-7680 doi:10.3319/TAO.2016.09.19.01 https://doaj.org/article/5d184dfa974f4114b2f1e15f9d813b32 Terrestrial, Atmospheric and Oceanic Sciences, Vol 28, Iss 3, p 371 (2017) Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 article 2017 ftdoajarticles https://doi.org/10.3319/TAO.2016.09.19.01 2022-12-31T02:13:30Z 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 Directory of Open Access Journals: DOAJ Articles 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 |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 Olakunle Ogunjobi Venkataraman Sivakumar Judy Ann Elizabeth Stephenson Zolile Mtumela PMSE long term observations using SuperDARN SANAE HF radar measurements |
topic_facet |
Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 |
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. |
format |
Article in Journal/Newspaper |
author |
Olakunle Ogunjobi Venkataraman Sivakumar Judy Ann Elizabeth Stephenson Zolile Mtumela |
author_facet |
Olakunle Ogunjobi Venkataraman Sivakumar Judy Ann Elizabeth Stephenson Zolile Mtumela |
author_sort |
Olakunle Ogunjobi |
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 |
Springer |
publishDate |
2017 |
url |
https://doi.org/10.3319/TAO.2016.09.19.01 https://doaj.org/article/5d184dfa974f4114b2f1e15f9d813b32 |
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_source |
Terrestrial, Atmospheric and Oceanic Sciences, Vol 28, Iss 3, p 371 (2017) |
op_relation |
http://tao.cgu.org.tw/media/k2/attachments/v283p371.pdf https://doaj.org/toc/1017-0839 https://doaj.org/toc/2311-7680 1017-0839 2311-7680 doi:10.3319/TAO.2016.09.19.01 https://doaj.org/article/5d184dfa974f4114b2f1e15f9d813b32 |
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_ |
1766268892454322176 |