Finland HF and Esrange MST radar observations of polar mesosphere summer echoes
Peculiar near range echoes observed in summer with the SuperDARN HF radar in Finland are presented. The echoes were detected at four frequencies of 9, 11, 13 and 15 MHz at slant ranges of 105–250 km for about 100 min. Interferometer measurements indicate that the echoes are returned from 80–100 km a...
Published in: | Annales Geophysicae |
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European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany)
2017
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Online Access: | http://www.ann-geophys.net/21/1047/2003/angeo-21-1047-2003.html http://hdl.handle.net/2381/39328 https://doi.org/10.5194/angeo-21-1047-2003 |
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ftleicester:oai:lra.le.ac.uk:2381/39328 2023-05-15T16:04:48+02:00 Finland HF and Esrange MST radar observations of polar mesosphere summer echoes Ogawa, T. Arnold, N. F. Kirkwood, S. Nishitani, N. Lester, M. 2017-02-06T14:34:14Z http://www.ann-geophys.net/21/1047/2003/angeo-21-1047-2003.html http://hdl.handle.net/2381/39328 https://doi.org/10.5194/angeo-21-1047-2003 en eng European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany) Annales Geophysicae, 2003, 21 (4), pp. 1047-1055 (9) 0992-7689 http://www.ann-geophys.net/21/1047/2003/angeo-21-1047-2003.html http://hdl.handle.net/2381/39328 doi:10.5194/angeo-21-1047-2003 1432-0576 © Author(s) 2003. This work is distributed under the Creative Commons Attribution 3.0 License. CC-BY Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology meteorology and atmospheric dynamics middle atmosphere dynamics thermospheric dynamics waves and tides instruments and techniques METEOR ECHOES VHF RADAR NETWORK OBSERVATIONS MESOPAUSE ECHOES PMSE SUPERDARN DYNASONDE DYNAMICS CAMPAIGN EISCAT Journal Article Article;Journal 2017 ftleicester https://doi.org/10.5194/angeo-21-1047-2003 2019-03-22T20:21:28Z Peculiar near range echoes observed in summer with the SuperDARN HF radar in Finland are presented. The echoes were detected at four frequencies of 9, 11, 13 and 15 MHz at slant ranges of 105–250 km for about 100 min. Interferometer measurements indicate that the echoes are returned from 80–100 km altitudes with elevation angles of 20◦–60◦ . Echo power (≤ 16 dB), Doppler velocity (between –30 and + 30 m s^−1 ) and spectral width (≤ 60 m s^−1 ) fluctuate with periods of several to 20 min, perhaps due to short–period atmospheric gravity waves. When the HF radar detected the echoes, a vertical incidence MST radar, located at Esrange in Sweden (650 km north of the HF radar site), observed polar mesosphere summer echoes (PMSE) at altitudes of 80– 90 km. This fact suggests that the near range HF echoes are PMSE at HF band, although both radars did not probe a common volume. With increasing radar frequency, HF echo ranges are closer to the radar site and echo power becomes weaker. Possible mechanisms to explain these features are discussed. The authors wish to thank the team of the Radio and Space Plasma Physics group at the University of Leicester who constructed, deployed and operated the CUTLASS HF radars. The ESRAD radar is jointly funded by the Swedish Space Corporation and the Swedish Research Council. N. F. Arnold was supported by an advanced fellowship from the UK Particle Physics and Astronomy Research Council and CUTLASS operations were funded by PPARC grant RP16021. Peer-reviewed Publisher Version Article in Journal/Newspaper EISCAT University of Leicester: Leicester Research Archive (LRA) Esrange ENVELOPE(21.117,21.117,67.883,67.883) Leicester ENVELOPE(-116.403,-116.403,55.717,55.717) Annales Geophysicae 21 4 1047 1055 |
institution |
Open Polar |
collection |
University of Leicester: Leicester Research Archive (LRA) |
op_collection_id |
ftleicester |
language |
English |
topic |
Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology meteorology and atmospheric dynamics middle atmosphere dynamics thermospheric dynamics waves and tides instruments and techniques METEOR ECHOES VHF RADAR NETWORK OBSERVATIONS MESOPAUSE ECHOES PMSE SUPERDARN DYNASONDE DYNAMICS CAMPAIGN EISCAT |
spellingShingle |
Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology meteorology and atmospheric dynamics middle atmosphere dynamics thermospheric dynamics waves and tides instruments and techniques METEOR ECHOES VHF RADAR NETWORK OBSERVATIONS MESOPAUSE ECHOES PMSE SUPERDARN DYNASONDE DYNAMICS CAMPAIGN EISCAT Ogawa, T. Arnold, N. F. Kirkwood, S. Nishitani, N. Lester, M. Finland HF and Esrange MST radar observations of polar mesosphere summer echoes |
topic_facet |
Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology meteorology and atmospheric dynamics middle atmosphere dynamics thermospheric dynamics waves and tides instruments and techniques METEOR ECHOES VHF RADAR NETWORK OBSERVATIONS MESOPAUSE ECHOES PMSE SUPERDARN DYNASONDE DYNAMICS CAMPAIGN EISCAT |
description |
Peculiar near range echoes observed in summer with the SuperDARN HF radar in Finland are presented. The echoes were detected at four frequencies of 9, 11, 13 and 15 MHz at slant ranges of 105–250 km for about 100 min. Interferometer measurements indicate that the echoes are returned from 80–100 km altitudes with elevation angles of 20◦–60◦ . Echo power (≤ 16 dB), Doppler velocity (between –30 and + 30 m s^−1 ) and spectral width (≤ 60 m s^−1 ) fluctuate with periods of several to 20 min, perhaps due to short–period atmospheric gravity waves. When the HF radar detected the echoes, a vertical incidence MST radar, located at Esrange in Sweden (650 km north of the HF radar site), observed polar mesosphere summer echoes (PMSE) at altitudes of 80– 90 km. This fact suggests that the near range HF echoes are PMSE at HF band, although both radars did not probe a common volume. With increasing radar frequency, HF echo ranges are closer to the radar site and echo power becomes weaker. Possible mechanisms to explain these features are discussed. The authors wish to thank the team of the Radio and Space Plasma Physics group at the University of Leicester who constructed, deployed and operated the CUTLASS HF radars. The ESRAD radar is jointly funded by the Swedish Space Corporation and the Swedish Research Council. N. F. Arnold was supported by an advanced fellowship from the UK Particle Physics and Astronomy Research Council and CUTLASS operations were funded by PPARC grant RP16021. Peer-reviewed Publisher Version |
format |
Article in Journal/Newspaper |
author |
Ogawa, T. Arnold, N. F. Kirkwood, S. Nishitani, N. Lester, M. |
author_facet |
Ogawa, T. Arnold, N. F. Kirkwood, S. Nishitani, N. Lester, M. |
author_sort |
Ogawa, T. |
title |
Finland HF and Esrange MST radar observations of polar mesosphere summer echoes |
title_short |
Finland HF and Esrange MST radar observations of polar mesosphere summer echoes |
title_full |
Finland HF and Esrange MST radar observations of polar mesosphere summer echoes |
title_fullStr |
Finland HF and Esrange MST radar observations of polar mesosphere summer echoes |
title_full_unstemmed |
Finland HF and Esrange MST radar observations of polar mesosphere summer echoes |
title_sort |
finland hf and esrange mst radar observations of polar mesosphere summer echoes |
publisher |
European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany) |
publishDate |
2017 |
url |
http://www.ann-geophys.net/21/1047/2003/angeo-21-1047-2003.html http://hdl.handle.net/2381/39328 https://doi.org/10.5194/angeo-21-1047-2003 |
long_lat |
ENVELOPE(21.117,21.117,67.883,67.883) ENVELOPE(-116.403,-116.403,55.717,55.717) |
geographic |
Esrange Leicester |
geographic_facet |
Esrange Leicester |
genre |
EISCAT |
genre_facet |
EISCAT |
op_relation |
Annales Geophysicae, 2003, 21 (4), pp. 1047-1055 (9) 0992-7689 http://www.ann-geophys.net/21/1047/2003/angeo-21-1047-2003.html http://hdl.handle.net/2381/39328 doi:10.5194/angeo-21-1047-2003 1432-0576 |
op_rights |
© Author(s) 2003. This work is distributed under the Creative Commons Attribution 3.0 License. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/angeo-21-1047-2003 |
container_title |
Annales Geophysicae |
container_volume |
21 |
container_issue |
4 |
container_start_page |
1047 |
op_container_end_page |
1055 |
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1766400440398774272 |