Longitudinal MLT wind structure at higher mid-latitudes as seen by meteor radars at central and Eastern Europe (13°E/49°E)

Korotyshkin, D.; Merzlyakov, E. G.; Jacobi, Ch.; Lilienthal, Friederike; Wu, Qian

doi:10.1016/j.asr.2019.01.036

Cited by 10 publications

(5 citation statements)

References 26 publications

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“…3 are weaker, and generally not significant. They are southward in spring/summer and weak in winter as also known from earlier observations (Jacobi, 2012;Korotyshkin et al, 2019a). The differences are positive in spring and summer, i.e.…”

Section: Mean Windssupporting

confidence: 83%

“…Wind profiles for 5 < Ap < 20 are added as dashed lines on the left-hand plots. In most cases these values fall in the range between those for Ap ≤ 5 and those for Ap ≥ 20 and this is always the case for significant The zonal wind vertical profiles show the known seasonal cycle of zonal mean winds (e.g., Manson and Meek, 1984;Schminder et al, 1997;Jacobi, 2012;Korotyshkin et al, 2019a), with easterly mesospheric winds in spring/summer and a wind reversal in the lower thermosphere, and mesospheric westerlies in autumn/winter with an indication of the lower thermospheric wind reversal which is, however, generally seen above the height range considered. The differences between disturbed and undisturbed conditions are on the order of 5 m s −1 , and they are positive (i.e.…”

Section: Mean Windsmentioning

confidence: 82%

“…The receiving system consists of five 2-elements Yagis. Collm and Kazan mean winds and SDT parameters have been analyzed by Korotyshkin et al (2019a). They found a non-significant mean wind difference connected with stationary planetary waves and a slight difference in latitude.…”

Section: Dataset Descriptionmentioning

confidence: 99%

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Influence of geomagnetic disturbances on mean winds and tides in the mesosphere/lower thermosphere at midlatitudes

et al. 2021

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Abstract. Observations of upper mesosphere/lower thermosphere (MLT) wind have been performed at Collm (51.3∘ N, 13.0∘ E) and Kazan (56∘ N, 49∘ E), using two SKiYMET all-sky meteor radars with similar configuration. Daily vertical profiles of mean winds and tidal amplitudes have been constructed from hourly horizontal winds. We analyse the response of mean winds and tidal amplitudes to geomagnetic disturbances. To this end, we compare winds and amplitudes for very quiet (Ap ≤ 5) and unsettled/disturbed (Ap ≥ 20) geomagnetic conditions. Zonal winds in both the mesosphere and lower thermosphere are weaker during disturbed conditions for both summer and winter. The summer equatorward meridional wind jet is weaker for disturbed geomagnetic conditions. Tendencies for geomagnetic effects on mean winds over Collm and Kazan qualitatively agree during most of the year. For the diurnal tide, amplitudes in summer are smaller in the mesosphere and greater in the lower thermosphere, but no clear tendency is seen for winter. Semidiurnal tidal amplitudes increase during geomagnetic active days in summer and winter. Terdiurnal amplitudes are slightly reduced in the mesosphere during disturbed days, but no clear effect is visible for the lower thermosphere. Overall, while there is a noticeable effect of geomagnetic variability on the mean wind, the effect on tidal amplitudes, except for the semidiurnal tide, is relatively small and partly different over Collm and Kazan.

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Section: Mean Windssupporting

confidence: 83%

Section: Mean Windsmentioning

confidence: 82%

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Influence of geomagnetic disturbances on mean winds and tides in the mesosphere/lower thermosphere at midlatitudes

et al. 2021

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“…As a result, the larger discrepancy during summer months is likely due to the instrument biases between MF and meteor radars and limited data used to develop HWM14 model. Korotyshkin et al studied the MLT wind structure by using two SKiYMET meteor radars (MRs) at Collm (51 • N, 13 • E) and Kazan (56 • N, 49 • E), and proposed that the stationary planetary waves (SPWs) significantly contribute to the difference between zonal prevailing winds mainly in winter [19]. Sudden stratospheric warming (SSW) is a large-scale thermo-dynamical phenomenon in the winter polar region, and the principal mechanism of SSW is attributed to amplified upward propagating SPWs [20].…”

Section: Discussion and Summarymentioning

confidence: 99%

A Comparison of Meteor Radar Observation over China Region with Horizontal Wind Model (HWM14)

Tang

Zhou

et al. 2021

Atmosphere

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This paper compares the wind fields measured by the meteor radar at Mohe, Beijing, Wuhan, and Sanya stations and horizontal wind model (HWM14) predictions. HWM14 appears to successfully reproduce the height-time distribution of the monthly mean zonal winds, although large discrepancies occur in wind speed between the model and measurement, especially in the summer and winter months. For meridional wind, the consistency between model prediction and radar observation is worse than that of zonal wind. The consistency between radar measurements and model prediction at Sanya station is worse than other sites located at higher latitudes. Harmonic analysis reveals large discrepancies in diurnal, semidiurnal, and terdiurnal tides extracted from meteor radar observations and HWM14 predictions.

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“…For the above purposes, we investigate the mesospheric wind observations collected by three meteor radars in three longitudinal sectors during SSW 2018. Figure S2 in the supporting information displays the distribution of the radars, at Juliusruh (54.6 • N, 13.4 • E), Mohe (53.5 • N, 122.3 • E), and Kazan (55.7 • N, 49 • E) (readers are referred to Korotyshkin et al, 2019;Singer et al, 2013;Yu et al, 2013, for the radar frequencies, antenna configurations, and other setups). Combining three radars allows us to diagnose the horizontal scale of the tides.…”

Section: Introductionmentioning

confidence: 99%

High‐Order Solar Migrating Tides Quench at SSW Onsets

Forbes

Chau

et al. 2020

Geophysical Research Letters

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Sudden stratospheric warming events (SSWs) are the most spectacular atmospheric vertical coupling processes, well‐known for being associated with diverse wave activities in the upper atmosphere and ionosphere. The first four solar tidal harmonics have been reported as being engaged. Here, combining mesospheric winds detected by three midlatitude radars, we demonstrate at least the first six harmonics that occurred during SSW 2018. Wave number diagnosis demonstrates that all six harmonics are dominated by migrating components. Wavelet analyses reveal that the fourth, fifth, and sixth harmonics quench after the SSW onset. The six harmonics and the quenching appear also in a statistical analysis based on near‐12‐year observations from one of the radars. We attribute the quenching to reversal of the background eastward wind.

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Longitudinal MLT wind structure at higher mid-latitudes as seen by meteor radars at central and Eastern Europe (13°E/49°E)

Cited by 10 publications

References 26 publications

Influence of geomagnetic disturbances on mean winds and tides in the mesosphere/lower thermosphere at midlatitudes

Influence of geomagnetic disturbances on mean winds and tides in the mesosphere/lower thermosphere at midlatitudes

A Comparison of Meteor Radar Observation over China Region with Horizontal Wind Model (HWM14)

High‐Order Solar Migrating Tides Quench at SSW Onsets

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