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| Titel |
Eureka, 80° N, SKiYMET meteor radar temperatures compared with Aura MLS values |
| VerfasserIn |
C. E. Meek, A. H. Manson, W. K. Hocking, J. R. Drummond |
| 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 ; 31, no. 7 ; Nr. 31, no. 7 (2013-07-23), S.1267-1277 |
| Datensatznummer |
250019070
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| Publikation (Nr.) |
 copernicus.org/angeo-31-1267-2013.pdf |
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| Zusammenfassung |
The meteor trail echo decay rates are analysed on-site to provide daily temperatures near 90 km. In order
to get temperatures from trail decay times,
either knowledge of the pressure
or the background temperature height gradient near 90 km is
required (Hocking, 1999).
Hocking et al. (2004)
have developed an empirical 90 km temperature gradient model
depending only on latitude and time of year,
which is used in the SKiYMET on-site meteor temperature analysis.
Here we look at the sensitivity of the resulting temperature
to the assumed gradient and compare it and the temperatures
with daily AuraMLS averages near Eureka.
Generally there is good agreement between radar and satellite
for winter temperatures and their short-term variations.
However there is a major difference
in mid-summer both in the temperatures and the gradients.
Increased turbulence in summer, which may overwhelm the ambipolar
diffusion even at 90 km, is likely a major factor.
These differences are investigated by generating
ambipolar-controlled decay times from satellite pressure
and temperature
data at a range of heights and comparing with radar measurements.
Our study suggests it may be possible to use these data to estimate eddy diffusion
coefficients at heights below 90 km.
Finally the simple temperature analysis (using satellite pressures),
and a standard meteor wind analysis are used to compare mean diurnal
variations of
temperature (T) with those of zonal wind (U) and meridional wind (V)
in composite multi-year monthly intervals. |
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