 |
| Titel |
Comparison of high-latitude thermospheric meridionalwinds II: combined FPI, radar and model Climatologies |
| VerfasserIn |
E. M. Griffin, A. Aruliah, I. C. F. Müller-Wodarg, A. Aylward |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 22, no. 3 ; Nr. 22, no. 3 (2004-03-19), S.863-876 |
| Datensatznummer |
250014807
|
| Publikation (Nr.) |
 copernicus.org/angeo-22-863-2004.pdf |
|
|
|
|
|
| Zusammenfassung |
The climatological behaviour of the thermospheric meridional wind above Kiruna, Sweden
(67.4°N, 20.4°E) has been investigated for seasonal and solar cycle dependence using six different
techniques, comprising both model and experimental sources. Model output from both the empirical
Horizontal Wind Model (HWM) (Hedin et al., 1988) and the numerical Coupled Thermosphere and
Ionosphere Model (CTIM) are compared to the measured behaviour at Kiruna, as a single site example.
The empirical International Reference Ionosphere (IRI) model is used as input to an implementation of
servo theory, to provide another climatology combining empirical input with a theoretical framework.
The experimental techniques have been introduced in a companion paper in this issue and provide
climatologies from direct measurements, using Fabry-Perot Interferometers (FPI), together with
2 separate techniques applied to the European Incoherent Scatter radar (EISCAT) database to derive
neutral winds. One of these techniques uses the same implementation of servo theory as has been used
with the IRI model. Detailed comparisons for each season and solar activity category allow for conclusions
to be drawn as to the major influences on the climatological behaviour of the wind at this latitude.
Comparison of the incoherent scatter radar (ISR) derived neutral winds with FPI, empirical model and
numerical model winds is important to our understanding and judgement of the validity of the
techniques used to derive thermospheric wind databases. The comparisons also test model performance
and indicate possible reasons for differences found between the models. In turn, the conclusions point to
possible improvements in their formulation. In particular it is found that the empirical models are
over-reliant on mid-latitude data in their formulation, and fail to provide accurate estimates of the winds at
high-latitudes.
Key words. Meteorology and atmospheric dynamics (thermospheric
dynamics), Ionosphere (ionosphere-atmosphere
interactions, auroral ionosphere) |
| |
|
| Teil von |
|
|
|
|
|
|
|
|