The University of Southampton
University of Southampton Institutional Repository

Auroral ion acoustic wave enhancement observed with a radar interferometer system

Auroral ion acoustic wave enhancement observed with a radar interferometer system
Auroral ion acoustic wave enhancement observed with a radar interferometer system
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.
0992-7689
837-844
Schlatter, N.M.
6005dd63-487b-45c3-af10-4479c4c3399b
Belyey, V.
8ac309cf-c101-427d-b692-0ec03efe287a
Gustavsson, B.
5ef90805-5748-4626-a3b6-85554fac934d
Ivchenko, N.
c892df9e-e2a0-450f-bf77-2673e029f565
Whiter, D.
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c
Dahlgren, H.
8d021086-b328-46fd-affd-a7c8d2b4687e
Tuttle, S.
7e19300b-8278-4b81-83ed-c3046a80c4d9
Schlatter, N.M.
6005dd63-487b-45c3-af10-4479c4c3399b
Belyey, V.
8ac309cf-c101-427d-b692-0ec03efe287a
Gustavsson, B.
5ef90805-5748-4626-a3b6-85554fac934d
Ivchenko, N.
c892df9e-e2a0-450f-bf77-2673e029f565
Whiter, D.
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c
Dahlgren, H.
8d021086-b328-46fd-affd-a7c8d2b4687e
Tuttle, S.
7e19300b-8278-4b81-83ed-c3046a80c4d9

Schlatter, N.M., Belyey, V., Gustavsson, B., Ivchenko, N., Whiter, D., Dahlgren, H. and Tuttle, S. (2015) Auroral ion acoustic wave enhancement observed with a radar interferometer system Annales Geophysicae, 33, (7), pp. 837-844.

Record type: Article

Abstract

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.

PDF angeo-33-837-2015.pdf - Version of Record
Available under License Other.
Download (1MB)

More information

Accepted/In Press date: 10 June 2015
Published date: 20 July 2015
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 397225
URI: http://eprints.soton.ac.uk/id/eprint/397225
ISSN: 0992-7689
PURE UUID: e6bf7f5e-ea39-4ec7-beb9-ea736c7bb18d
ORCID for D. Whiter: ORCID iD orcid.org/0000-0001-7130-232X

Catalogue record

Date deposited: 22 Jun 2016 13:09
Last modified: 26 Oct 2017 00:57

Export record

Contributors

Author: N.M. Schlatter
Author: V. Belyey
Author: B. Gustavsson
Author: N. Ivchenko
Author: D. Whiter ORCID iD
Author: H. Dahlgren
Author: S. Tuttle

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×