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| Titel |
Arctic and Antarctic polar mesosphere summer echoes observed with oblique incidence HF radars: analysis using simultaneous MF and VHF radar data |
| VerfasserIn |
T. Ogawa, S. Nozawa, M. Tsutsumi, N. F. Arnold, N. Nishitani, N. Sato, A. S. Yukimatu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 22, no. 12 ; Nr. 22, no. 12 (2004-12-22), S.4049-4059 |
| Datensatznummer |
250015072
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| Publikation (Nr.) |
 copernicus.org/angeo-22-4049-2004.pdf |
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| Zusammenfassung |
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.
Key words. Meteorology and atmospheric dynamics (middle
atmosphere dynamics; thermospheric dynamics; waves
and tides) |
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