Auroral ion acoustic wave enhancement observed with a radar interferometer system
Published version. Source at http://doi.org/10.5194/angeo-33-837-2015 . Measurements of naturally enhanced ion acoustic line (NEIAL) echoes obtained with a five-antenna interferometric imaging radar system are presented. The observations were conducted with the European Incoherent SCATter (EISCAT) r...
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Online Access: | https://hdl.handle.net/10037/8719 https://doi.org/10.5194/angeo-33-837-2015 |
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ftunivtroemsoe:oai:munin.uit.no:10037/8719 2023-05-15T16:04:36+02:00 Auroral ion acoustic wave enhancement observed with a radar interferometer system Schlatter, Nicola M. Belyey, Vasyl Gustavsson, Björn Johan Ivchenko, Nickolay Whiter, Daniel Dahlgren, Hanna Tuttle, Sam Grydeland, Tom 2015-07-20 https://hdl.handle.net/10037/8719 https://doi.org/10.5194/angeo-33-837-2015 eng eng Copernicus Publications Annales Geophysicae 2015, 33(7):837-844 FRIDAID 1277850 doi:10.5194/angeo-33-837-2015 0992-7689 https://hdl.handle.net/10037/8719 URN:NBN:no-uit_munin_8291 openAccess Ionosphere (Auroral ionosphere) VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 Journal article Tidsskriftartikkel Peer reviewed 2015 ftunivtroemsoe https://doi.org/10.5194/angeo-33-837-2015 2021-06-25T17:54:37Z Published version. Source at http://doi.org/10.5194/angeo-33-837-2015 . Measurements of naturally enhanced ion acoustic line (NEIAL) echoes obtained with a five-antenna interferometric imaging radar system are presented. The observations were conducted with the European Incoherent SCATter (EISCAT) radar on Svalbard and the EISCAT Aperture Synthesis Imaging receivers (EASI) installed at the radar site. Four baselines of the interferometer are used in the analysis. Based on the coherence estimates derived from the measurements, we show that the enhanced backscattering region is of limited extent in the plane perpendicular to the geomagnetic field. Previously it has been argued that the enhanced backscatter region is limited in size; however, here the first unambiguous observations are presented. The size of the enhanced backscatter region is determined to be less than 900 × 500 m, and at times less than 160 m in the direction of the longest antenna separation, assuming the scattering region to have a Gaussian scattering cross section in the plane perpendicular to the geomagnetic field. Using aperture synthesis imaging methods volumetric images of the NEIAL echo are obtained showing the enhanced backscattering region to be aligned with the geomagnetic field. Although optical auroral emissions are observed outside the radar look direction, our observations are consistent with the NEIAL echo occurring on field lines with particle precipitation. Article in Journal/Newspaper EISCAT Svalbard University of Tromsø: Munin Open Research Archive Svalbard Annales Geophysicae 33 7 837 844 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
Ionosphere (Auroral ionosphere) VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 |
spellingShingle |
Ionosphere (Auroral ionosphere) VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 Schlatter, Nicola M. Belyey, Vasyl Gustavsson, Björn Johan Ivchenko, Nickolay Whiter, Daniel Dahlgren, Hanna Tuttle, Sam Grydeland, Tom Auroral ion acoustic wave enhancement observed with a radar interferometer system |
topic_facet |
Ionosphere (Auroral ionosphere) VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437 VDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437 |
description |
Published version. Source at http://doi.org/10.5194/angeo-33-837-2015 . Measurements of naturally enhanced ion acoustic line (NEIAL) echoes obtained with a five-antenna interferometric imaging radar system are presented. The observations were conducted with the European Incoherent SCATter (EISCAT) radar on Svalbard and the EISCAT Aperture Synthesis Imaging receivers (EASI) installed at the radar site. Four baselines of the interferometer are used in the analysis. Based on the coherence estimates derived from the measurements, we show that the enhanced backscattering region is of limited extent in the plane perpendicular to the geomagnetic field. Previously it has been argued that the enhanced backscatter region is limited in size; however, here the first unambiguous observations are presented. The size of the enhanced backscatter region is determined to be less than 900 × 500 m, and at times less than 160 m in the direction of the longest antenna separation, assuming the scattering region to have a Gaussian scattering cross section in the plane perpendicular to the geomagnetic field. Using aperture synthesis imaging methods volumetric images of the NEIAL echo are obtained showing the enhanced backscattering region to be aligned with the geomagnetic field. Although optical auroral emissions are observed outside the radar look direction, our observations are consistent with the NEIAL echo occurring on field lines with particle precipitation. |
format |
Article in Journal/Newspaper |
author |
Schlatter, Nicola M. Belyey, Vasyl Gustavsson, Björn Johan Ivchenko, Nickolay Whiter, Daniel Dahlgren, Hanna Tuttle, Sam Grydeland, Tom |
author_facet |
Schlatter, Nicola M. Belyey, Vasyl Gustavsson, Björn Johan Ivchenko, Nickolay Whiter, Daniel Dahlgren, Hanna Tuttle, Sam Grydeland, Tom |
author_sort |
Schlatter, Nicola M. |
title |
Auroral ion acoustic wave enhancement observed with a radar interferometer system |
title_short |
Auroral ion acoustic wave enhancement observed with a radar interferometer system |
title_full |
Auroral ion acoustic wave enhancement observed with a radar interferometer system |
title_fullStr |
Auroral ion acoustic wave enhancement observed with a radar interferometer system |
title_full_unstemmed |
Auroral ion acoustic wave enhancement observed with a radar interferometer system |
title_sort |
auroral ion acoustic wave enhancement observed with a radar interferometer system |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://hdl.handle.net/10037/8719 https://doi.org/10.5194/angeo-33-837-2015 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_relation |
Annales Geophysicae 2015, 33(7):837-844 FRIDAID 1277850 doi:10.5194/angeo-33-837-2015 0992-7689 https://hdl.handle.net/10037/8719 URN:NBN:no-uit_munin_8291 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.5194/angeo-33-837-2015 |
container_title |
Annales Geophysicae |
container_volume |
33 |
container_issue |
7 |
container_start_page |
837 |
op_container_end_page |
844 |
_version_ |
1766400194338881536 |