PMSE strength during enhanced D region electron densities: Faraday rotation and absorption effects at VHF frequencies
In this paper we study the effects of absorption and Faraday rotation on measurements of polar mesosphere summer echoes (PMSE). We found that such effects can produce significant reduction of signal-to-noise ratio (SNR) when the D region electron densities (Ne) are enhanced, and VHF radar systems wi...
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ftdlr:oai:elib.dlr.de:85370 2023-05-15T13:25:40+02:00 PMSE strength during enhanced D region electron densities: Faraday rotation and absorption effects at VHF frequencies Chau, Jorge L. Röttger, Jürgen Rapp, Markus 2014 application/pdf http://elib.dlr.de/85370/ http://elib.dlr.de/85370/1/Chau-etal-JSTP2014.pdf http://www.sciencedirect.com/science/article/pii/S1364682613001910 de ger Elsevier http://elib.dlr.de/85370/1/Chau-etal-JSTP2014.pdf Chau, Jorge L. und Röttger, Jürgen und Rapp, Markus (2014) PMSE strength during enhanced D region electron densities: Faraday rotation and absorption effects at VHF frequencies. Journal of Atmospheric and Solar-Terrestrial Physics, 118, Seiten 113-118. Elsevier. DOI:10.1016/j.jastp.2013.06.015. ISSN 1364-6826. Institut für Physik der Atmosphäre Zeitschriftenbeitrag PeerReviewed 2014 ftdlr https://doi.org/10.1016/j.jastp.2013.06.015 2016-03-29T05:51:18Z In this paper we study the effects of absorption and Faraday rotation on measurements of polar mesosphere summer echoes (PMSE). We found that such effects can produce significant reduction of signal-to-noise ratio (SNR) when the D region electron densities (Ne) are enhanced, and VHF radar systems with linearly polarized antennas are used. In particular we study the expected effects during the strong solar proton event (SPE) of July 2000, also known as the Bastille day flare event. During this event, a strong anti-correlation between the PMSE SNR and the D-region Ne was found over three VHF radar sites at high latitudes: Andøya, Kiruna, and Svalbard. This anti-correlation has been explained (a) in terms of transport effects due to strong electric fields associated to the SPE and (b) due to a limited amount of aerosol particles as compared to the amount of D-region electrons. Our calculations using the Ne profiles used by previous researchers explain most, if not all, of the observed SNR reduction in both time (around the SPE peak) and altitude. This systematic effect, particularly the Faraday rotation, should be recognized and tested, and possibly avoided (e.g., using circular polarization), in future observations during the incoming solar maximum period, to contribute to the understanding of PMSE during enhanced D region Ne. Other Non-Article Part of Journal/Newspaper Andøya Kiruna Svalbard German Aerospace Center: elib - DLR electronic library Andøya ENVELOPE(13.982,13.982,68.185,68.185) Faraday ENVELOPE(-64.256,-64.256,-65.246,-65.246) Kiruna Svalbard Journal of Atmospheric and Solar-Terrestrial Physics 118 113 118 |
institution |
Open Polar |
collection |
German Aerospace Center: elib - DLR electronic library |
op_collection_id |
ftdlr |
language |
German |
topic |
Institut für Physik der Atmosphäre |
spellingShingle |
Institut für Physik der Atmosphäre Chau, Jorge L. Röttger, Jürgen Rapp, Markus PMSE strength during enhanced D region electron densities: Faraday rotation and absorption effects at VHF frequencies |
topic_facet |
Institut für Physik der Atmosphäre |
description |
In this paper we study the effects of absorption and Faraday rotation on measurements of polar mesosphere summer echoes (PMSE). We found that such effects can produce significant reduction of signal-to-noise ratio (SNR) when the D region electron densities (Ne) are enhanced, and VHF radar systems with linearly polarized antennas are used. In particular we study the expected effects during the strong solar proton event (SPE) of July 2000, also known as the Bastille day flare event. During this event, a strong anti-correlation between the PMSE SNR and the D-region Ne was found over three VHF radar sites at high latitudes: Andøya, Kiruna, and Svalbard. This anti-correlation has been explained (a) in terms of transport effects due to strong electric fields associated to the SPE and (b) due to a limited amount of aerosol particles as compared to the amount of D-region electrons. Our calculations using the Ne profiles used by previous researchers explain most, if not all, of the observed SNR reduction in both time (around the SPE peak) and altitude. This systematic effect, particularly the Faraday rotation, should be recognized and tested, and possibly avoided (e.g., using circular polarization), in future observations during the incoming solar maximum period, to contribute to the understanding of PMSE during enhanced D region Ne. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Chau, Jorge L. Röttger, Jürgen Rapp, Markus |
author_facet |
Chau, Jorge L. Röttger, Jürgen Rapp, Markus |
author_sort |
Chau, Jorge L. |
title |
PMSE strength during enhanced D region electron densities: Faraday rotation and absorption effects at VHF frequencies |
title_short |
PMSE strength during enhanced D region electron densities: Faraday rotation and absorption effects at VHF frequencies |
title_full |
PMSE strength during enhanced D region electron densities: Faraday rotation and absorption effects at VHF frequencies |
title_fullStr |
PMSE strength during enhanced D region electron densities: Faraday rotation and absorption effects at VHF frequencies |
title_full_unstemmed |
PMSE strength during enhanced D region electron densities: Faraday rotation and absorption effects at VHF frequencies |
title_sort |
pmse strength during enhanced d region electron densities: faraday rotation and absorption effects at vhf frequencies |
publisher |
Elsevier |
publishDate |
2014 |
url |
http://elib.dlr.de/85370/ http://elib.dlr.de/85370/1/Chau-etal-JSTP2014.pdf http://www.sciencedirect.com/science/article/pii/S1364682613001910 |
long_lat |
ENVELOPE(13.982,13.982,68.185,68.185) ENVELOPE(-64.256,-64.256,-65.246,-65.246) |
geographic |
Andøya Faraday Kiruna Svalbard |
geographic_facet |
Andøya Faraday Kiruna Svalbard |
genre |
Andøya Kiruna Svalbard |
genre_facet |
Andøya Kiruna Svalbard |
op_relation |
http://elib.dlr.de/85370/1/Chau-etal-JSTP2014.pdf Chau, Jorge L. und Röttger, Jürgen und Rapp, Markus (2014) PMSE strength during enhanced D region electron densities: Faraday rotation and absorption effects at VHF frequencies. Journal of Atmospheric and Solar-Terrestrial Physics, 118, Seiten 113-118. Elsevier. DOI:10.1016/j.jastp.2013.06.015. ISSN 1364-6826. |
op_doi |
https://doi.org/10.1016/j.jastp.2013.06.015 |
container_title |
Journal of Atmospheric and Solar-Terrestrial Physics |
container_volume |
118 |
container_start_page |
113 |
op_container_end_page |
118 |
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1766387197937713152 |