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| Titel |
Comparison of high-latitude thermospheric meridionalwinds I: optical and radar experimental comparisons |
| VerfasserIn |
E. M. Griffin, I. C. F. Müller-Wodarg, A. Aruliah, A. Aylward |
| 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. 3 ; Nr. 22, no. 3 (2004-03-19), S.849-862 |
| Datensatznummer |
250014806
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| Publikation (Nr.) |
 copernicus.org/angeo-22-849-2004.pdf |
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| Zusammenfassung |
| Thermospheric neutral winds at Kiruna, Sweden (67.4°N, 20.4°E) are compared using both
direct optical Fabry-Perot Interferometer (FPI) measurements and those derived from European
incoherent scatter radar (EISCAT) measurements. This combination of experimental data sets, both
covering well over a solar cycle of data, allows for a unique comparison of the thermospheric meridional
component of the neutral wind as observed by different experimental techniques. Uniquely in this study
the EISCAT measurements are used to provide winds for comparison using two separate techniques:
the most popular method based on the work of Salah and Holt (1974) and the Meridional Wind Model
(MWM) (Miller et al., 1997) application of servo theory. The balance of forces at this location that
produces the observed diurnal pattern are investigated using output from the Coupled Thermosphere
and Ionosphere (CTIM) numerical model. Along with detailed comparisons from short periods the
climatological behaviour of the winds have been investigated for seasonal and solar cycle dependence
using the experimental techniques. While there are features which are consistent between the
3 techniques, such as the evidence of the equinoctial asymmetry, there are also significant differences
between the techniques both in terms of trends and absolute values. It is clear from this and previous
studies that the high-latitude representation of the thermospheric neutral winds from the empirical
Horizontal Wind Model (HWM), though improved from earlier versions, lacks accuracy in many
conditions. The relative merits of each technique are discussed and while none of the techniques
provides the perfect data set to address model performance at high-latitude, one or more needs to be
included in future HWM reformulations.
Key words. Meteorology and atmospheric dynamics (thermospheric
dynamics), Ionosphere (ionosphere-atmosphere
interactions, auroral ionosphere) |
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