Arctic and Antarctic polar mesosphere summer echoes observed with oblique incidence HF radars: analysis using simultaneous MF and VHF radar data
Polar mesosphere summer echoes (PMSEs) have been well studied using vertical incidence VHF radars at northern high-latitudes. In this paper, two PMSE events detected with the oblique incidence SuperDARN HF radars at Hankasalmi, Finland (62.3° N) and Syowa Station, Antarctica (69.0° S), are analyzed,...
Published in: | Annales Geophysicae |
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ftcopernicus:oai:publications.copernicus.org:angeo35570 2023-05-15T13:36:36+02:00 Arctic and Antarctic polar mesosphere summer echoes observed with oblique incidence HF radars: analysis using simultaneous MF and VHF radar data Ogawa, T. Nozawa, S. Tsutsumi, M. Arnold, N. F. Nishitani, N. Sato, N. Yukimatu, A. S. 2018-09-27 application/pdf https://doi.org/10.5194/angeo-22-4049-2004 https://angeo.copernicus.org/articles/22/4049/2004/ eng eng doi:10.5194/angeo-22-4049-2004 https://angeo.copernicus.org/articles/22/4049/2004/ eISSN: 1432-0576 Text 2018 ftcopernicus https://doi.org/10.5194/angeo-22-4049-2004 2020-07-20T16:27:31Z Polar mesosphere summer echoes (PMSEs) have been well studied using vertical incidence VHF radars at northern high-latitudes. In this paper, two PMSE events detected with the oblique incidence SuperDARN HF radars at Hankasalmi, Finland (62.3° N) and Syowa Station, Antarctica (69.0° S), are analyzed, together with simultaneous VHF and medium-frequency (MF) radar data. Altitude resolutions of the HF radars in the mesosphere and the lower thermosphere are too poor to know exact PMSE altitudes. However, a comparison of Doppler velocity from the HF radar and neutral wind velocity from the MF radar shows that PMSEs at the HF band appeared at altitudes within 80-90km, which are consistent with those from previous vertical incidence HF-VHF radar results. The HF-VHF PMSE occurrences exhibit a semidiurnal behavior, as observed by other researchers. It is found that in one event, PMSEs occurred when westward semidiurnal winds with large amplitude at 85-88km altitudes attained a maximum. When the HF-VHF PMSEs were observed at distances beyond 180km from MF radar sites, the MF radars detected no appreciable signatures of echo enhancement. Key words. Meteorology and atmospheric dynamics (middle atmosphere dynamics; thermospheric dynamics; waves and tides) Text Antarc* Antarctic Antarctica Arctic Copernicus Publications: E-Journals Antarctic Arctic Syowa Station Annales Geophysicae 22 12 4049 4059 |
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Copernicus Publications: E-Journals |
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English |
description |
Polar mesosphere summer echoes (PMSEs) have been well studied using vertical incidence VHF radars at northern high-latitudes. In this paper, two PMSE events detected with the oblique incidence SuperDARN HF radars at Hankasalmi, Finland (62.3° N) and Syowa Station, Antarctica (69.0° S), are analyzed, together with simultaneous VHF and medium-frequency (MF) radar data. Altitude resolutions of the HF radars in the mesosphere and the lower thermosphere are too poor to know exact PMSE altitudes. However, a comparison of Doppler velocity from the HF radar and neutral wind velocity from the MF radar shows that PMSEs at the HF band appeared at altitudes within 80-90km, which are consistent with those from previous vertical incidence HF-VHF radar results. The HF-VHF PMSE occurrences exhibit a semidiurnal behavior, as observed by other researchers. It is found that in one event, PMSEs occurred when westward semidiurnal winds with large amplitude at 85-88km altitudes attained a maximum. When the HF-VHF PMSEs were observed at distances beyond 180km from MF radar sites, the MF radars detected no appreciable signatures of echo enhancement. Key words. Meteorology and atmospheric dynamics (middle atmosphere dynamics; thermospheric dynamics; waves and tides) |
format |
Text |
author |
Ogawa, T. Nozawa, S. Tsutsumi, M. Arnold, N. F. Nishitani, N. Sato, N. Yukimatu, A. S. |
spellingShingle |
Ogawa, T. Nozawa, S. Tsutsumi, M. Arnold, N. F. Nishitani, N. Sato, N. Yukimatu, A. S. Arctic and Antarctic polar mesosphere summer echoes observed with oblique incidence HF radars: analysis using simultaneous MF and VHF radar data |
author_facet |
Ogawa, T. Nozawa, S. Tsutsumi, M. Arnold, N. F. Nishitani, N. Sato, N. Yukimatu, A. S. |
author_sort |
Ogawa, T. |
title |
Arctic and Antarctic polar mesosphere summer echoes observed with oblique incidence HF radars: analysis using simultaneous MF and VHF radar data |
title_short |
Arctic and Antarctic polar mesosphere summer echoes observed with oblique incidence HF radars: analysis using simultaneous MF and VHF radar data |
title_full |
Arctic and Antarctic polar mesosphere summer echoes observed with oblique incidence HF radars: analysis using simultaneous MF and VHF radar data |
title_fullStr |
Arctic and Antarctic polar mesosphere summer echoes observed with oblique incidence HF radars: analysis using simultaneous MF and VHF radar data |
title_full_unstemmed |
Arctic and Antarctic polar mesosphere summer echoes observed with oblique incidence HF radars: analysis using simultaneous MF and VHF radar data |
title_sort |
arctic and antarctic polar mesosphere summer echoes observed with oblique incidence hf radars: analysis using simultaneous mf and vhf radar data |
publishDate |
2018 |
url |
https://doi.org/10.5194/angeo-22-4049-2004 https://angeo.copernicus.org/articles/22/4049/2004/ |
geographic |
Antarctic Arctic Syowa Station |
geographic_facet |
Antarctic Arctic Syowa Station |
genre |
Antarc* Antarctic Antarctica Arctic |
genre_facet |
Antarc* Antarctic Antarctica Arctic |
op_source |
eISSN: 1432-0576 |
op_relation |
doi:10.5194/angeo-22-4049-2004 https://angeo.copernicus.org/articles/22/4049/2004/ |
op_doi |
https://doi.org/10.5194/angeo-22-4049-2004 |
container_title |
Annales Geophysicae |
container_volume |
22 |
container_issue |
12 |
container_start_page |
4049 |
op_container_end_page |
4059 |
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1766081578272817152 |