Aspect sensitivity measurements of polar mesosphere summer echoes using coherent radar imaging
The Esrange VHF radar (ESRAD), located in northern Sweden (67.88° N, 21.10° E), has been used to investigate polar mesosphere summer echoes (PMSE). During July and August of 1998, coherent radar imaging (CRI) was used to study the dynamic evolution of PMSE with high temporal and spatial resolution....
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ftdoajarticles:oai:doaj.org/article:800d6fd0e9cc4d1bb7904062a3c1eb99 2023-05-15T17:44:45+02:00 Aspect sensitivity measurements of polar mesosphere summer echoes using coherent radar imaging P. B. Chilson T.-Y. Yu R. D. Palmer S. Kirkwood 2002-02-01T00:00:00Z https://doi.org/10.5194/angeo-20-213-2002 https://doaj.org/article/800d6fd0e9cc4d1bb7904062a3c1eb99 EN eng Copernicus Publications https://www.ann-geophys.net/20/213/2002/angeo-20-213-2002.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-20-213-2002 0992-7689 1432-0576 https://doaj.org/article/800d6fd0e9cc4d1bb7904062a3c1eb99 Annales Geophysicae, Vol 20, Pp 213-223 (2002) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2002 ftdoajarticles https://doi.org/10.5194/angeo-20-213-2002 2022-12-31T12:37:24Z The Esrange VHF radar (ESRAD), located in northern Sweden (67.88° N, 21.10° E), has been used to investigate polar mesosphere summer echoes (PMSE). During July and August of 1998, coherent radar imaging (CRI) was used to study the dynamic evolution of PMSE with high temporal and spatial resolution. A CRI analysis provides an estimate of the angular brightness distribution within the radar’s probing volume. The brightness distribution is directly related to the radar reflectivity. Consequently, these data are used to investigate the aspect sensitivity of PMSE. In addition to the CRI analysis, the full correlation analysis (FCA) is used to derive estimates of the prevailing three-dimensional wind associated with the observed PMSE. It is shown that regions within the PMSE with enhanced aspect sensitivity have a correspondingly high signal-to-noise ratio (SNR). Although this relationship has been investigated in the past, the present study allows for an estimation of the aspect sensitivity independent of the assumed scattering models and avoids the complications of comparing echo strengths from vertical and off-vertical beams over large horizontal separations, as in the Doppler Beam Swinging (DBS) method. Regions of enhanced aspect sensitivity were additionally shown to correlate with the wave-perturbation induced downward motions of air parcels embedded in the PMSE. Key words. Ionosphere (polar ionosphere) Meteorology and Atmospheric Dynamics (middle atmosphere dynamics) Radio Science (Interferometry) Article in Journal/Newspaper Northern Sweden Directory of Open Access Journals: DOAJ Articles Esrange ENVELOPE(21.117,21.117,67.883,67.883) Annales Geophysicae 20 2 213 223 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 P. B. Chilson T.-Y. Yu R. D. Palmer S. Kirkwood Aspect sensitivity measurements of polar mesosphere summer echoes using coherent radar imaging |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
The Esrange VHF radar (ESRAD), located in northern Sweden (67.88° N, 21.10° E), has been used to investigate polar mesosphere summer echoes (PMSE). During July and August of 1998, coherent radar imaging (CRI) was used to study the dynamic evolution of PMSE with high temporal and spatial resolution. A CRI analysis provides an estimate of the angular brightness distribution within the radar’s probing volume. The brightness distribution is directly related to the radar reflectivity. Consequently, these data are used to investigate the aspect sensitivity of PMSE. In addition to the CRI analysis, the full correlation analysis (FCA) is used to derive estimates of the prevailing three-dimensional wind associated with the observed PMSE. It is shown that regions within the PMSE with enhanced aspect sensitivity have a correspondingly high signal-to-noise ratio (SNR). Although this relationship has been investigated in the past, the present study allows for an estimation of the aspect sensitivity independent of the assumed scattering models and avoids the complications of comparing echo strengths from vertical and off-vertical beams over large horizontal separations, as in the Doppler Beam Swinging (DBS) method. Regions of enhanced aspect sensitivity were additionally shown to correlate with the wave-perturbation induced downward motions of air parcels embedded in the PMSE. Key words. Ionosphere (polar ionosphere) Meteorology and Atmospheric Dynamics (middle atmosphere dynamics) Radio Science (Interferometry) |
format |
Article in Journal/Newspaper |
author |
P. B. Chilson T.-Y. Yu R. D. Palmer S. Kirkwood |
author_facet |
P. B. Chilson T.-Y. Yu R. D. Palmer S. Kirkwood |
author_sort |
P. B. Chilson |
title |
Aspect sensitivity measurements of polar mesosphere summer echoes using coherent radar imaging |
title_short |
Aspect sensitivity measurements of polar mesosphere summer echoes using coherent radar imaging |
title_full |
Aspect sensitivity measurements of polar mesosphere summer echoes using coherent radar imaging |
title_fullStr |
Aspect sensitivity measurements of polar mesosphere summer echoes using coherent radar imaging |
title_full_unstemmed |
Aspect sensitivity measurements of polar mesosphere summer echoes using coherent radar imaging |
title_sort |
aspect sensitivity measurements of polar mesosphere summer echoes using coherent radar imaging |
publisher |
Copernicus Publications |
publishDate |
2002 |
url |
https://doi.org/10.5194/angeo-20-213-2002 https://doaj.org/article/800d6fd0e9cc4d1bb7904062a3c1eb99 |
long_lat |
ENVELOPE(21.117,21.117,67.883,67.883) |
geographic |
Esrange |
geographic_facet |
Esrange |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_source |
Annales Geophysicae, Vol 20, Pp 213-223 (2002) |
op_relation |
https://www.ann-geophys.net/20/213/2002/angeo-20-213-2002.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-20-213-2002 0992-7689 1432-0576 https://doaj.org/article/800d6fd0e9cc4d1bb7904062a3c1eb99 |
op_doi |
https://doi.org/10.5194/angeo-20-213-2002 |
container_title |
Annales Geophysicae |
container_volume |
20 |
container_issue |
2 |
container_start_page |
213 |
op_container_end_page |
223 |
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1766147037055680512 |