scholarly journals Calculation of meridional neutral winds in the middle latitudes from the Irkutsk incoherent scatter radar

2015 ◽  
Vol 120 (12) ◽  
pp. 10,851-10,863 ◽  
Author(s):  
A. A. Shcherbakov ◽  
A. V. Medvedev ◽  
D. S. Kushnarev ◽  
M. V. Tolstikov ◽  
S. S. Alsatkin
Keyword(s):  
Incoherent Scatter Radar ◽  
Neutral Winds ◽  
Incoherent Scatter ◽  
Middle Latitudes ◽  
Scatter Radar

scholarly journals Calculation of meridional neutral winds in middle latitudes from the Irkutsk incoherent scatter radar data

2015 ◽  
Vol 1 (3) ◽  
pp. 37-48
Author(s):  
Александр Щербаков ◽  
Aleksandr Shcherbakov ◽  
Андрей Медведев ◽  
Andrey Medvedev ◽  
Дмитрий Кушнарев ◽  
...  
Keyword(s):  
Electric Fields ◽  
Radar Data ◽  
Special Technique ◽  
Incoherent Scatter Radar ◽  
Neutral Winds ◽  
Incoherent Scatter ◽  
Plasma Drift ◽  
Middle Latitudes ◽  
Scatter Radar ◽  
The Impact

The paper sequentially presents technique for determining velocity of meridional neutral winds from the Irkutsk Incoherent Scatter Radar (IISR) data. Due to IISR specific features effective at other IS radars, techniques for determining ionosphere parameters, in particular plasma drift velocities, resulted in considerable variance of defined parameters. To measure the plasma drift velocity taking into account such IISR features, we have developed a special technique based on phase analysis of autocorrelation function of incoherent scatter signal. The technique needs to be tested, and for this purpose, an experiment was carried out to measure velocities of low-orbit satellites. However, methods for meridional neutral wind calculations used by many authors [Evans, 1970] with the use of drift velocities obtained before, resulted in great disagreements with empirical HWM93 and HWM07 wind models. In addition, simultaneous measurements at two frequencies at IISR showed that it was difficult to explain such differences without taking into account the cross-field movements. Possible underestimation of the impact of movements generated by electric fields can result in serious error in determining wind velocities. The paper considers improvements for methods of calculating winds, and shows that the results obtained with it are in a better agreement with wind models.

scholarly journals Comparison of high-latitude thermospheric meridionalwinds II: combined FPI, radar and model Climatologies

2004 ◽  
Vol 22 (3) ◽  
pp. 863-876 ◽  
Author(s):  
E. M. Griffin ◽  
A. Aruliah ◽  
I. C. F. Müller-Wodarg ◽  
A. Aylward
Keyword(s):  
Model Performance ◽  
Meridional Wind ◽  
Companion Paper ◽  
Horizontal Wind ◽  
Test Model ◽  
Incoherent Scatter Radar ◽  
Iri Model ◽  
Neutral Winds ◽  
Incoherent Scatter ◽  
Scatter Radar

Abstract. 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)

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