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PMSE strength during enhanced D region electron densities: Faraday rotation and absorption effects at VHF frequencies

Chau, Jorge L. and Röttger, Jürgen and 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, pp. 113-118. Elsevier. DOI: 10.1016/j.jastp.2013.06.015 ISSN 1364-6826

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Official URL: http://www.sciencedirect.com/science/article/pii/S1364682613001910

Abstract

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.

Item URL in elib:https://elib.dlr.de/85370/
Document Type:Article
Title:PMSE strength during enhanced D region electron densities: Faraday rotation and absorption effects at VHF frequencies
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Chau, Jorge L.Radio Observatorio de Jicamarca, Lima, PeruUNSPECIFIED
Röttger, JürgenMax Planck Institute for Solar Systems, LindauUNSPECIFIED
Rapp, MarkusDLR, IPAUNSPECIFIED
Date:2014
Journal or Publication Title:Journal of Atmospheric and Solar-Terrestrial Physics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:118
DOI :10.1016/j.jastp.2013.06.015
Page Range:pp. 113-118
Publisher:Elsevier
ISSN:1364-6826
Status:Published
Keywords:PMSE, Faraday rotation at high latitudes, D region absorption
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Deposited By: Ziegele, Brigitte
Deposited On:15 Nov 2013 21:38
Last Modified:19 Nov 2014 11:58

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