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Arctic and Antarctic polar mesosphere summer echoes observed with oblique incidence HF radars: analysis using simultaneous MF and VHF radar data

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posted on 2016-01-29, 17:45 authored by T. Ogawa, S. Nozawa, M. Tsutsumi, N. F. Arnold, N. Nishitani, N. Sato, A. S. Yukimatu
Polar mesosphere summer echoes (PMSEs) have been well studied using vertical incidence VHF radars at northern high-latitudes. In this paper, two PMSE events detected with the oblique incidence SuperDARN HF radars at Hankasalmi, Finland (62.3° N) and Syowa Station, Antarctica (69.0° S), are analyzed, together with simultaneous VHF and medium-frequency (MF) radar data. Altitude resolutions of the HF radars in the mesosphere and the lower thermosphere are too poor to know exact PMSE altitudes. However, a comparison of Doppler velocity from the HF radar and neutral wind velocity from the MF radar shows that PMSEs at the HF band appeared at altitudes within 80-90km, which are consistent with those from previous vertical incidence HF-VHF radar results. The HF-VHF PMSE occurrences exhibit a semidiurnal behavior, as observed by other researchers. It is found that in one event, PMSEs occurred when westward semidiurnal winds with large amplitude at 85-88km altitudes attained a maximum. When the HF-VHF PMSEs were observed at distances beyond 180km from MF radar sites, the MF radars detected no appreciable signatures of echo enhancement.

Funding

N. F. Arnold was supported by an advanced fellowship from the UK Particle Physics and Astronomy Research Council.

History

Citation

Annales Geophysicae 22, 4049-4059, 2004

Version

  • VoR (Version of Record)

Published in

Annales Geophysicae 22

Publisher

European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany)

issn

0992-7689

eissn

1432-0576

Acceptance date

2004-09-09

Copyright date

2004

Available date

2016-01-29

Publisher version

http://www.ann-geophys.net/22/4049/2004/

Language

en

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