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| Titel |
Comparison of D-region Doppler drift winds measured by the SuperDARN Finland HF radar over an annual cycle using the Kiruna VHF meteor radar |
| VerfasserIn |
N. F. Arnold, P. A. Cook, T. R. Robinson, Mark Lester, P. J. Chapman, N. Mitchell |
| 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 ; 21, no. 10 ; Nr. 21, no. 10, S.2073-2082 |
| Datensatznummer |
250014700
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| Publikation (Nr.) |
 copernicus.org/angeo-21-2073-2003.pdf |
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| Zusammenfassung |
The SuperDARN chain of
oblique HF radars has provided an opportunity to generate a unique climatology
of horizontal winds near the mesopause at a number of high latitude locations,
via the Doppler shifted echoes from sources of ionisation in the D-region.
Ablating meteor trails form the bulk of these targets, but other phenomena also
contribute to the observations. Due to the poor vertical resolution of the
radars, care must be taken to reduce possible biases from sporadic-E layers and
Polar Mesospheric Summer echoes that can affect the effective altitude of the
geophysical parameters being observed. Second, there is strong theoretical and
observational evidence to suggest that the radars are picking up echoes from
the backward looking direction that will tend to reduce the measured wind
strengths. The effect is strongly frequency dependent, resulting in a 20%
reduction at 12 MHz and a 50% reduction at 10 MHz. A comparison of the
climatologies observed by the Super-DARN Finland radar between September 1999
and September 2000 and that obtained from the adjacent VHF meteor radar located
at Kiruna is also presented. The agreement between the two instruments was very
good. Extending the analysis to the SuperDARN Iceland East radar indicated that
the principles outlined above could be applied successfully to the rest of the
SuperDARN network.
Key words. Ionosphere
(ionosphere-atmosphere interactions; instruments and techniques) –
Meteorology and atmospheric dynamics (waves and tides) |
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