Infrasound - the cause of strong Polar Mesosphere Winter Echoes?
International audience The ESRAD 52-MHz and the EISCAT 224-MHz radars in northern Scandinavia observed thin layers of strongly enhanced radar echoes from the mesosphere (Polar Mesosphere Winter Echoes - PMWE) during a solar proton event in November 2004. Using the interferometric capabilities of ESR...
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ftinsu:oai:HAL:hal-00317954v1 2024-01-07T09:42:59+01:00 Infrasound - the cause of strong Polar Mesosphere Winter Echoes? Kirkwood, S. Chilson, P. Belova, E. Dalin, P. Häggström, I. Rietveld, M. Singer, W. Swedish Institute of Space Physics Kiruna (IRF) School of Meteorology Norman University of Oklahoma (OU) EISCAT Scientific Association Leibniz-Institute of Atmospheric Physics (AIP) 2006-03-23 https://hal.science/hal-00317954 https://hal.science/hal-00317954/document https://hal.science/hal-00317954/file/angeo-24-475-2006.pdf en eng HAL CCSD European Geosciences Union hal-00317954 https://hal.science/hal-00317954 https://hal.science/hal-00317954/document https://hal.science/hal-00317954/file/angeo-24-475-2006.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317954 Annales Geophysicae, 2006, 24 (2), pp.475-491 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2006 ftinsu 2023-12-13T17:24:02Z International audience The ESRAD 52-MHz and the EISCAT 224-MHz radars in northern Scandinavia observed thin layers of strongly enhanced radar echoes from the mesosphere (Polar Mesosphere Winter Echoes - PMWE) during a solar proton event in November 2004. Using the interferometric capabilities of ESRAD it was found that the scatterers responsible for PMWE show very high horizontal travel speeds, up to 500 ms -1 or more, and high aspect sensitivity, with echo arrival angles spread over as little as 0.3°. ESRAD also detected, on some occasions, discrete scattering regions moving across the field of view with periodicities of a few seconds. The very narrow, vertically directed beam of the more powerful EISCAT radar allowed measurements of the spectral widths of the radar echoes both inside the PMWE and from the background plasma above and below the PMWE. Spectral widths inside the PMWE were found to be indistinguishable from those from the background plasma. We propose that scatter from highly-damped ion-acoustic waves generated by partial reflection of infrasonic waves provides a reasonable explanation of the characteristics of the very strong PMWE reported here. Article in Journal/Newspaper EISCAT Institut national des sciences de l'Univers: HAL-INSU |
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Institut national des sciences de l'Univers: HAL-INSU |
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language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Kirkwood, S. Chilson, P. Belova, E. Dalin, P. Häggström, I. Rietveld, M. Singer, W. Infrasound - the cause of strong Polar Mesosphere Winter Echoes? |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The ESRAD 52-MHz and the EISCAT 224-MHz radars in northern Scandinavia observed thin layers of strongly enhanced radar echoes from the mesosphere (Polar Mesosphere Winter Echoes - PMWE) during a solar proton event in November 2004. Using the interferometric capabilities of ESRAD it was found that the scatterers responsible for PMWE show very high horizontal travel speeds, up to 500 ms -1 or more, and high aspect sensitivity, with echo arrival angles spread over as little as 0.3°. ESRAD also detected, on some occasions, discrete scattering regions moving across the field of view with periodicities of a few seconds. The very narrow, vertically directed beam of the more powerful EISCAT radar allowed measurements of the spectral widths of the radar echoes both inside the PMWE and from the background plasma above and below the PMWE. Spectral widths inside the PMWE were found to be indistinguishable from those from the background plasma. We propose that scatter from highly-damped ion-acoustic waves generated by partial reflection of infrasonic waves provides a reasonable explanation of the characteristics of the very strong PMWE reported here. |
author2 |
Swedish Institute of Space Physics Kiruna (IRF) School of Meteorology Norman University of Oklahoma (OU) EISCAT Scientific Association Leibniz-Institute of Atmospheric Physics (AIP) |
format |
Article in Journal/Newspaper |
author |
Kirkwood, S. Chilson, P. Belova, E. Dalin, P. Häggström, I. Rietveld, M. Singer, W. |
author_facet |
Kirkwood, S. Chilson, P. Belova, E. Dalin, P. Häggström, I. Rietveld, M. Singer, W. |
author_sort |
Kirkwood, S. |
title |
Infrasound - the cause of strong Polar Mesosphere Winter Echoes? |
title_short |
Infrasound - the cause of strong Polar Mesosphere Winter Echoes? |
title_full |
Infrasound - the cause of strong Polar Mesosphere Winter Echoes? |
title_fullStr |
Infrasound - the cause of strong Polar Mesosphere Winter Echoes? |
title_full_unstemmed |
Infrasound - the cause of strong Polar Mesosphere Winter Echoes? |
title_sort |
infrasound - the cause of strong polar mesosphere winter echoes? |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-00317954 https://hal.science/hal-00317954/document https://hal.science/hal-00317954/file/angeo-24-475-2006.pdf |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317954 Annales Geophysicae, 2006, 24 (2), pp.475-491 |
op_relation |
hal-00317954 https://hal.science/hal-00317954 https://hal.science/hal-00317954/document https://hal.science/hal-00317954/file/angeo-24-475-2006.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1787424231964803072 |