The Influence of Tropospheric Processes on Disturbances in the D and E Ionospheric Layers

We present the results of a comprehensive study of the manifestation of wave activity with periods of internal gravity waves (IGW) in various regions of the atmosphere: in the stratosphere, upper mesosphere, and in the F2-region of the ionosphere. The study is based on radiophysical and spectrometric measurements made with tools of the Institute of Solar-Terrestrial Physics (ISTP) SB RAS and the Era-Interim reanalysis data. The correlation coefficient with time shift between ionospheric and stratospheric activity for the annual interval varies in the range from 0.45 to 0.54, and for the 27-day interval it reaches the levels 0.4–0.8 in seventy percent of the cases. Thirty percent of correlation coefficients less than 0.4 can be explained by the influence of neutral wind, geomagnetic activity, and non-stratospheric IGW sources. Comparison between stratospheric activity and variations in characteristics of traveling ionospheric disturbances (TID) has shown that a ~15 day shift in stratospheric activity results in a fairly high correlation between stratospheric activity and disturbance of IGW characteristics (~0.6). The delay of about 15 days can be attributed to the delay in the temperature variations at heights of the lower thermosphere relative to the temperature variations at the altitude pressure level of 1 hPa. Comparative analysis of variations in mesospheric and ionospheric activity has revealed time intervals when their behavior is consistent.

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Disturbances of the Thermosphere and the Ionosphere during a Meteorological Storm

Atmosphere ◽

10.3390/atmos12111384 ◽

2021 ◽

Vol 12 (11) ◽

pp. 1384

Author(s):

Olga P. Borchevkina ◽

Yuliya A. Kurdyaeva ◽

Yurii A. Dyakov ◽

Ivan V. Karpov ◽

Gennady V. Golubkov ◽

...

Keyword(s):

Acoustic Waves ◽

Internal Gravity Waves ◽

Electron Content ◽

Atmospheric Physics ◽

Wave Source ◽

Total Electron ◽

Noticeable Increase ◽

Physical Mechanisms ◽

Lidar Sensing

Determination of the physical mechanisms of energy transfer of tropospheric disturbances to the ionosphere is one of the fundamental problems of atmospheric physics. This article presents the results of observations carried out using two-wavelength lidar sensing at tropospheric altitudes and satellite GPS measurements during a meteorological storm in Kaliningrad (Russia, 54.7° N, 20.5° E) on 1 April 2016. During lidar sensing, it was found that the amplitudes of variations in atmospheric parameters with periods of acoustic (AWs) and internal gravity (IGWs) waves significantly increased. As a result of numerical modeling using the AtmoSym software package, it was shown that there is a noticeable increase in the period of temperature disturbances from 6–12 min to 10–17 min at altitudes from 150 km up to 230 km during the vertical propagation of acoustic waves and internal gravity waves from the troposphere. Nonlinear and dissipative processes in this layer lead to the formation of sources of secondary waves in the thermosphere with periods longer than those of primary ones. In this case, the unsteady nature of the wave source and the short duration of its operation does not lead to significant heating of the thermosphere. Simultaneous satellite observations demonstrate the response of the ionosphere (total electron content (TEC) disturbance) to tropospheric disturbances. Analysis of the time series of the amplitudes of the reflected lidar signal and TEC made it possible to determine that the response time of the ionosphere to tropospheric disturbances is 30–40 min.

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Estimated influence of stratospheric activity on the ionosphere according to measurements with ISTP SB RAS tools

Solnechno-Zemnaya Fizika ◽

10.12737/szf-74202108 ◽

2021 ◽

Vol 7 (4) ◽

pp. 84-90

Author(s):

Maksim Tolstikov ◽

Konstantin Ratovsky ◽

Irina Medvedeva ◽

Denis Khabituev

Keyword(s):

Gravity Waves ◽

Lower Thermosphere ◽

Correlation Coefficients ◽

Internal Gravity Waves ◽

Reanalysis Data ◽

Time Shift ◽

Ionospheric Disturbances ◽

Time Intervals ◽

Temperature Variations ◽

Comprehensive Study

We present the results of a comprehensive study of the manifestation of wave activity with periods of internal gravity waves (IGW) in various regions of the atmosphere: in the stratosphere, upper mesosphere, and in the F2-region of the ionosphere. The study is based on radiophysical and spectrometric measurements made with tools of the Institute of Solar-Terrestrial Physics (ISTP) SB RAS and the Era-Interim reanalysis data. The correlation coefficient with time shift between ionospheric and stratospheric activity for the annual interval varies in the range from 0.45 to 0.54, and for the 27-day interval it reaches the levels 0.4–0.8 in seventy percent of the cases. Thirty percent of correlation coefficients less than 0.4 can be explained by the influence of neutral wind, geomagnetic activity, and non-stratospheric IGW sources. Comparison between stratospheric activity and variations in characteristics of traveling ionospheric disturbances (TID) has shown that a ~15 day shift in stratospheric activity results in a fairly high correlation between stratospheric activity and disturbance of IGW characteristics (~0.6). The delay of about 15 days can be attributed to the delay in the temperature variations at heights of the lower thermosphere relative to the temperature variations at the altitude pressure level of 1 hPa. Comparative analysis of variations in mesospheric and ionospheric activity has revealed time intervals when their behavior is consistent.

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Structure and evolution of internal gravity waves and traveling ionospheric disturbances in regions with sharp gradients of the ionospheric parameters

Journal of Geophysical Research Atmospheres ◽

10.1029/2006ja012220 ◽

2007 ◽

Vol 112 (A7) ◽

pp. n/a-n/a ◽

Cited By ~ 3

Author(s):

Elena S. Belashova ◽

Vasily Y. Belashov ◽

Sergey V. Vladimirov

Keyword(s):

Gravity Waves ◽

Internal Gravity Waves ◽

Ionospheric Disturbances ◽

Traveling Ionospheric Disturbances

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Geomagnetic dependence of ionospheric disturbances induced by tsunamigenic internal gravity waves

Geophysical Journal International ◽

10.1111/j.1365-246x.2008.03760.x ◽

2008 ◽

Vol 173 (3) ◽

pp. 753-765 ◽

Cited By ~ 73

Author(s):

Giovanni Occhipinti ◽

E. Alam Kherani ◽

Philippe Lognonné

Keyword(s):

Gravity Waves ◽

Internal Gravity Waves ◽

Ionospheric Disturbances

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Can laboratory experiments reach regimes relevant for the oceanic dynamics?

10.5194/egusphere-egu21-10904 ◽

2021 ◽

Author(s):

Costanza Rodda ◽

Clement Savaro ◽

Antoine Campagne ◽

Miguel Calpe Linares ◽

Pierre Augier ◽

...

Keyword(s):

Gravity Waves ◽

Scaling Laws ◽

Spatial Scales ◽

Scaling Law ◽

Internal Gravity Waves ◽

Energy Spectra ◽

Finite Size Effect ◽

Wave Turbulence ◽

Common Mechanism ◽

Buoyancy Frequency

Atmospheric and oceanic energy spectra are characterized by global scaling laws, suggesting a common mechanism driving the energy route to dissipation. Although several possible theories have been proposed, it is not clear yet what the phenomena contributing the most to the energy at the different spatial scales are. One possible scenario is that internal gravity waves, which can be ubiquitously found in the atmosphere and the ocean and play a fundamental role in the energy transfer, cause the observed spectral slopes at the mesoscales in the atmosphere and submesoscales in the oceans. In the context of this open field of investigation, we present an experimental study where internal gravity waves are forced at a given frequency by the oscillating walls of a large pentagonal-shaped domain filled with a stably stratified fluid. The setup is built inside the 13-meters-diameter tank at the Coriolis facility in Grenoble, where geophysical regimes (with high Reynolds number and low Froude) can be achieved and rotation can also be added. The purpose of our investigation is to determine whether it is possible to induce a wave turbulence cascade by forcing internal waves at the large scales. Following a previous study1, where instead of the pentagonal a square domain was utilized, we obtained the velocity field employing time-resolved particle image velocimetry and then calculated the energy spectra. The previous study inside a square domain showed some evidence of a cascade, but it was strongly affected by 2D modes that sharpened the spectrum. Therefore, we changed the domain shape to a pentagon to reduce this finite-size effect. When the waves are forced at frequency &#969;F=0.4 N, our data shows that the spectra follow the scaling law &#969;-2&#160;at frequencies larger than the forcing frequency and extending beyond N. The experimental spectra strikingly resemble the characteristic Garret-Munk spectrum measured in the ocean. As the interaction of weakly non-linear waves dominates the dynamics at frequencies smaller than the buoyancy frequency N, we can conclude that the experimental spectra are generated by weak internal wave turbulence driving the turbulent cascade at the high-frequency end of the spectrum.&#160;&#160;1 "Generation of weakly nonlinear turbulence of internal gravity waves in the Coriolis facility", C. Savaro, A. Campagne, M. Calpe Linares, P. Augier, J. Sommeria, T. Valran, S. Viboud, and N. Mordant, PRF 2020

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First GPS TEC maps of ionospheric disturbances induced by reflected tsunami waves: The Tohoku case study

10.5194/nhess-2016-11 ◽

2016 ◽

Author(s):

L. Tang ◽

Y. Zhao ◽

J. An

Keyword(s):

Gravity Waves ◽

Arrival Time ◽

Tohoku Earthquake ◽

Internal Gravity Waves ◽

Ionospheric Disturbances ◽

Propagation Characteristics ◽

Tsunami Waves ◽

Travelling Ionospheric Disturbances ◽

Ionospheric Height

Abstract. The straight tsunami waves from epicenter can be reflected when they reach to coasts or underwater obstacles. In this study, we present the first ionospheric maps of reflected tsunami signature caused by the great 11 March 2011 Tohoku earthquake using the dense GPS network GEONET in Japan. We observed tsunami-like travelling ionospheric disturbances (TIDs) with similar propagation characteristics in terms of waveform, horizontal velocity, direction, period and arrival time compared to the reflected tsunami at the sea-level, indicating the TIDs are induced by the reflected tsunami. The results confirm the atmospheric internal gravity waves (IGWs) produced by reflected tsunami can also propagate upward to the atmosphere and interact with the plasma at the ionospheric height.

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1705 Determination of Spatial Structure of Internal Gravity Waves by Multi-channel Thermo-Anemometer Measurement

The Proceedings of the Fluids engineering conference ◽

10.1299/jsmefed.2005.247 ◽

2005 ◽

Vol 2005 (0) ◽

pp. 247

Author(s):

Katsuhisa OHBA ◽

Hideharu MAKITA

Keyword(s):

Spatial Structure ◽

Gravity Waves ◽

Internal Gravity Waves

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Front-orography interactions during landfall of the New Year's Day Storm 1992

10.5194/wcd-2019-9 ◽

2019 ◽

Author(s):

Clemens Spensberger ◽

Sebastian Schemm

Keyword(s):

Gravity Waves ◽

Wind Band ◽

Spatial Scales ◽

Internal Gravity Waves ◽

Sensitivity Analyses ◽

Cold Fronts ◽

Warm Sector ◽

The Cross ◽

Flow Deflection ◽

Crest Height

Abstract. Although following a common synoptic evolution for this region, the New Year's Day Storm 1992 was associated with some of the strongest winds observed along the Norwegian West Cost. The narrow wind band along its bent-back front became famous as the poisonous tail, and paved the way towards today's sting jet terminology. This article re-examines the storm's landfall with a particular focus on the interaction with the orography. Sensitivity analyses based on WRF simulations demonstrate that the formation and the evolution of the warm-air seclusion and its poisonous tail are largely independent from orography. In contrast, the warm sector of the storm is undergoing considerable orographically induced modifications. Both warm and cold fronts are eroded rapidly, and the warm sector is lifted over the orography, thereby accelerating the occlusion process. The insensitivity of the warm-air seclusion to the orographic modifications of the warm sector raises the question to which extent these entities are still interacting after the onset of the occlusion process. Further, we observe ubiquitous and large-amplitude internal gravity waves (IGWs) during the landfall of the warm and cold fronts, exceeding in amplitude the cross-frontal circulation. As the spatial scales of the IGW pattern and of the fronts are comparable, we speculate that wave-front interactions might have contributed to the rapid erosion of the cross-frontal temperature gradient over the orography. Further, IGWs might also provide a plausible cause for the observed near-instantaneous flow deflection around orography at 500 hPa, well above crest height.

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