Travelling wave packets generated by the solar terminator in the upper atmosphere

2010 ◽  
Vol 23 (1) ◽  
pp. 21-27
Author(s):  
E. L. Afraimovich ◽  
I. K. Edemskiy ◽  
S. V. Voeykov ◽  
Yu. V. Yasyukevich ◽  
I. V. Zhivetiev
Keyword(s):  
Wave Packets ◽  
Travelling Wave ◽  
Upper Atmosphere ◽  
Solar Terminator

Modeling the propagation of atmospheric waves from various tropospheric disturbances and studying their influence on the upper atmosphere

2020 ◽  
Author(s):  
Yuliya Kurdyaeva ◽  
Olga Borchevkina ◽  
Sergey Kshevetskii
Keyword(s):  
Gravity Waves ◽  
Coastal Region ◽  
Internal Gravity Waves ◽  
Travelling Wave ◽  
The State ◽  
Upper Atmosphere ◽  
Small Scale ◽  
Research Project ◽  
Atmospheric Waves ◽  
The Earth

<p>The atmosphere and ionosphere are a complex dynamic system, which is affected by sources, caused both by internal processes and external ones. It is known that atmospheric waves propagating from the troposphere to the upper atmosphere make a significant contribution to the state of this system. One of the regular sources of such waves are various tropospheric disturbances caused, for example, by meteorological processes. Numerical modeling is an effective tool for studying these processes and the effects they cause. However, a number of problems arise, while setting up numerical experiments. The first is that most atmospheric models use hydrostatic approximation (which does not allow the resolution of small-scale perturbations) and work for a limited range of heights (which does not allow studying the relationship between the lower and upper atmosphere). This demands an accurate selection of the model in accordance with the stated research goals. The second problem is the difficulty of direct definition of the wave tropospheric sources, that was mentioned before, due to the lack of experimental information for their detailed description. The authors proposed, researched and tested a way to solve this problem. It was shown that the solution of the problem of waves propagation from a certain tropospheric source is completely determined by the pressure field at the surface of the Earth. This work is devoted to solving various problems using this approach.</p><p>This study presents the results of calculations of the propagation of infrasound and internal gravity waves from tropospheric disturbances given by pressure variations at the surface of the Earth. The experimental data associated with various meteorological events and the passage of the solar terminator were obtained both directly - by a network of microbarographs in the studied region, and indirectly - based on the data from the LIDAR signal intensity and temperature changes in the coastal region. The calculations were done using the non-hydrostatic numerical model “AtmoSym”. The characteristics of atmospheric waves generated by such sources are estimated. The effect from a tropospheric sources on the state of the upper atmosphere and ionosphere is investigated. The physical processes that determine the change in atmospheric parameters are discussed.  It is shown that the main contribution from wave disturbances generated by meteorological sources belongs to infrasound. Infrasound and internal gravity waves can be sources of travelling wave packets and can also cause a sporadic E-layer.</p><p>The study was funded by RFBR and Kaliningrad region according to the research project  19-45-390005 (Y. Kurdyaeva) and  RFBR to the research project  18-05-00184 (O. Borchevkina).</p>

Spatio-temporal structure of the wave packets generated by the solar terminator

2009 ◽  
Vol 44 (7) ◽  
pp. 824-835 ◽  
Author(s):  
E.L. Afraimovich ◽  
I.K. Edemskiy ◽  
S.V. Voeykov ◽  
Yu.V. Yasyukevich ◽  
I.V. Zhivetiev
Keyword(s):  
Wave Packets ◽  
Temporal Structure ◽  
Solar Terminator ◽  
Spatio Temporal

scholarly journals Observing wave packets generated by solar terminator in TEC during typhoons

2018 ◽  
Vol 4 (2) ◽  
pp. 33-40
Author(s):  
Илья Едемский ◽  
Ilya Edemsky ◽  
Анна Ясюкевич ◽  
Anna Yasyukevich
Keyword(s):  
Tropical Cyclones ◽  
Wave Packets ◽  
Maximum Amplitude ◽  
Electron Content ◽  
Ionospheric Disturbances ◽  
Total Electron ◽  
The Pacific ◽  
Typhoon Center ◽  
The Pacific Ocean ◽  
Solar Terminator

In this work, we study ionospheric disturbances excited by the passage of the solar terminator (ST) during tropical cyclones, using total electron content (TEC) data. We have considered 16 intense tropical cyclones (typhoons) that acted in the northwest of the Pacific Ocean near the territory of Japan. We analyze two-dimensional distributions of the number of registered wave packets (WPs) depending on various parameters: local time, WP maximum amplitude, and distance to typhoon. It is shown that in most cases the maximum number of WPs is observed at a distance less than 500–1500 km from the typhoon center and near the time of evening solar terminator passage. For typhoons occurring during autumn periods, the maximum number of WPs is recorded at daytime, and, apparently, is not associated with ST. Distributions of the number of WPs depending on their amplitude have a similar form for all the cases considered, with a maximum of about 0.2 TECU. At the same time, for some typhoons there are a large number of WPs with amplitude up to 0.6–0.8 TECU, which is significantly higher than WP amplitudes under quiet conditions. We briefly discuss the mechanism of possible interaction between ionospheric disturbances caused by two different sources (tropical cyclones and ST passage).

Middle and upper atmosphere radar observations of ionospheric density gradients produced by gravity wave packets

1994 ◽  
Vol 99 (A4) ◽  
pp. 6321 ◽  
Author(s):  
W. L. Oliver ◽  
S. Fukao ◽  
Y. Yamamoto ◽  
T. Takami ◽  
M. D. Yamanaka ◽  
...  
Keyword(s):  
Gravity Wave ◽  
Wave Packets ◽  
Upper Atmosphere ◽  
Density Gradients ◽  
Radar Observations

The magnetohydrodynamic nature of ionospheric wave packets excited by the solar terminator

2009 ◽  
Vol 429 (1) ◽  
pp. 1354-1358
Author(s):  
E. L. Afraimovich ◽  
S. V. Voeykov ◽  
I. K. Edemskiy ◽  
Yu. V. Yasyukevich
Keyword(s):  
Wave Packets ◽  
Ionospheric Wave ◽  
Solar Terminator

Finite-amplitude gravity waves in the atmosphere: travelling wave solutions

2017 ◽  
Vol 826 ◽  
pp. 1034-1065 ◽  
Author(s):  
Mark Schlutow ◽  
R. Klein ◽  
U. Achatz
Keyword(s):  
Wave Packet ◽  
Wave Packets ◽  
Vertical Component ◽  
Travelling Wave ◽  
Moving Frame ◽  
Travelling Wave Solutions ◽  
Mean Flow ◽  
Large Wave ◽  
Modulation Equations ◽  
Wave Solutions

Wentzel–Kramers–Brillouin theory was employed by Grimshaw (Geophys. Fluid Dyn., vol. 6, 1974, pp. 131–148) and Achatz et al. (J. Fluid Mech., vol. 210, 2010, pp. 120–147) to derive modulation equations for non-hydrostatic internal gravity wave packets in the atmosphere. This theory allows for wave packet envelopes with vertical extent comparable to the pressure scale height and for large wave amplitudes with wave-induced mean-flow speeds comparable to the local fluctuation velocities. Two classes of exact travelling wave solutions to these nonlinear modulation equations are derived here. The first class involves horizontally propagating wave packets superimposed over rather general background states. In a co-moving frame of reference, examples from this class have a structure akin to stationary mountain lee waves. Numerical simulations corroborate the existence of nearby travelling wave solutions under the pseudo-incompressible model and reveal better than expected convergence with respect to the asymptotic expansion parameter. Travelling wave solutions of the second class also feature a vertical component of their group velocity but exist under isothermal background stratification only. These waves include an interesting nonlinear wave–mean-flow interaction process: a horizontally periodic wave packet propagates vertically while draining energy from the mean wind aloft. In the process it decelerates the lower-level wind. It is shown that the modulation equations apply equally to hydrostatic waves in the limit of large horizontal wavelengths. Aside from these results of direct physical interest, the new nonlinear travelling wave solutions provide a firm basis for subsequent studies of nonlinear internal wave instability and for the design of subtle test cases for numerical flow solvers.

scholarly journals MHD nature of ionospheric wave packets generated by the solar terminator

2010 ◽  
Vol 50 (1) ◽  
pp. 79-95 ◽  
Author(s):  
E. L. Afraimovich ◽  
I. K. Edemsky ◽  
S. V. Voeykov ◽  
Yu. V. Yasukevich ◽  
I. V. Zhivetiev
Keyword(s):  
Wave Packets ◽  
Ionospheric Wave ◽  
Solar Terminator
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