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First observations of the artificial modulation of polar mesospheric winter echoes

Kavanagh, A. J. and Honary, F. and Rietveld, M. T. and Senior, A. (2006) First observations of the artificial modulation of polar mesospheric winter echoes. Geophysical Research Letters, 33 (19). L19801. ISSN 0094-8276

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Abstract

We demonstrate for the first time that the application of ionospheric heating can affect the strength of polar mesospheric winter echoes (PMWE) detected by VHF radar. PMWE were observed between 61.8 and 68.5 km altitude and we show that the signal strength can be modulated with 10-second and 1-minute cycles. The structures that cause PMWE are shown to extend over several hundred meters (∼300 m) with echoes existing in two height regimes simultaneously and a descent in altitude indicative of gravity wave effects. The effect on PMWE of ionospheric heating has similar gross features to those for PMSE: a sharp decrease in power when HF heating is switched on followed by a sharp increase when heating is switched off. During the period of active heating there is some recovery in echo power suggestive of dust control of the PMWE.

Item Type: Article
Journal or Publication Title: Geophysical Research Letters
Uncontrolled Keywords: eiscat ; heating ; pmwe ; mesosphere DCS-publications-id ; art-788 ; DCS-publications-credits ; iono-fa ; DCS-publications-personnel-id ; 9 ; 5 ; 51
Subjects: T Technology > T Technology (General)
Departments: Faculty of Science and Technology > School of Computing & Communications
Faculty of Science and Technology > Physics
Faculty of Science and Technology > Engineering
ID Code: 6698
Deposited By: ep_importer_dcs
Deposited On: 21 Apr 2008 12:07
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 22:12
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/6698

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