Solar terminator and dynamic phenomena in the atmosphere: A review

Somsikov, V. M.

doi:10.1134/s0016793211060168

Cited by 36 publications

(31 citation statements)

References 36 publications

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“…[], in the transition region between F1 and F2 layers, there exist sharp gradients in electron and ion concentrations due to the different response of F1 and F2 regions to the radiation flux changes induced by the solar terminators and solar eclipses. Somsikov [, ] have confirmed that the narrow region of sharp gradients of temperature, pressure, and density between two states of atmosphere corresponding to the coolings and heatings processes linked with the solar terminators can be the source of AGWs. The scales of AGWs excited by heatings and coolings depend on the scales of the heatings and coolings regions, as well as the time duration of the heatings and coolings processes [ Vadas and Fritts , ; Vadas , ].…”

Section: Resultsmentioning

confidence: 99%

Statistical study of large‐scale traveling ionospheric disturbances generated by the solar terminator over China

et al. 2013

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This paper presents a statistical result of large‐scale traveling ionospheric disturbances (LSTIDs) associated with moving solar terminator in China during 12 months from February 2011 to January 2012. The LSTIDs are identified by the two‐dimensional total electron content (TEC) perturbation maps, which are built based on the observations of GPS network data from China. The GPS observations are combined with the observations from an ionosonde chain established by the Institute of Geology and Geophysics, Chinese Academy of Sciences. A total of 135 LSTID events are identified at dawn, while there is indiscernible LSTID at dusk. Meanwhile, these LSTIDs are captured by the ionosonde chain which shows that there are perturbations in the virtual heights during the passage of LSTIDs at the height between 200 and 700 km. The occurrence rate of LSTIDs shows a maximum in winter and a minimum in summer. The LSTIDs propagate across China with phase front widths larger than 1500 km. The propagation direction of LSTIDs is northwestward in winter, southwestward in summer, and quasi‐westward in equinoxes, respectively. The average period, horizontal phase velocity, and horizontal wavelength of LSTIDs are 79 ± 12 min, 288 ± 43 m/s, and 1503 ± 205 km, respectively. The relative TEC perturbations of the LSTIDs attenuate as the LSTIDs travel across China.

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Section: Resultsmentioning

confidence: 99%

Statistical study of large‐scale traveling ionospheric disturbances generated by the solar terminator over China

et al. 2013

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“…While solar occultation measurements across the terminator region can provide good vertical resolution, these measurements have very limited horizontal (LT) resolution. Somsikov (2011) provides the most recent review of theoretical and experimental work on the subject, including much smaller-scale inhomogeneities and waves associated with the terminator in both the neutral atmosphere and ionosphere. Forbes and Moudden (2009) used a high-resolution general circulation model to reveal TW in Mars' lower and upper atmosphere and achieved similar results and conclusions as Miyoshi et al (2009).…”

Section: Geophysical Research Lettersmentioning

confidence: 99%

Solar Terminator Waves in Surface Pressure Observations

Hedlin

Groot‐Hedlin

Forbes

et al. 2018

Geophysical Research Letters

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We report observations of waveforms in surface pressure made over several years by a network of ground‐level barometers in the eastern United States. The waveforms can be reconstructed by superimposing the 4th through 10th subharmonics of the solar day. Some of these solar harmonics are likely generated by the temperature and pressure gradients across the solar terminators. The measurements presented here enable a wave detection analysis which indicates that some waveforms are coherent between stations with a median speed of 49.7 m/s to the southeast. We interpret these propagating signals, which are interference patterns created by internal gravity waves with periods that are subharmonics of a solar day, as a previously undiscovered type of terminator wave. The waveforms appear predominantly postsunrise during winter and postsunset in summer. Their quasi‐eastward propagation direction suggests an analogy with “stern” waves left behind by the faster, westward‐moving terminator.

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“…The first two terms in Eq.7 correspond to the description of atmospheric perturbation in the linear approach [7]. These terms are responsible for acoustic-gravity wave's generation in the equilibrium atmosphere.…”

Section: The First Step To Grsmentioning

confidence: 99%

“…The interaction solar radiation with atmospheric gas in the ST region in some cases can lead to instability [8,18]. The mechanism of this instability is caused by the gradient of the solar radiation absorption coefficient during sunrise.…”

Section: The Linear Model Of the Atmosphereic Disturbances Generated mentioning

confidence: 99%

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Solar radiation and atmospheric dynamics

Somsikov¹

2014

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This paper studies the problems of mathematical description of physical processes in open non-equilibrium atmosphere. It is proposed that the mathematical description should be based on the idea that properties of an open system are determined by the properties of its elements and external constraints. It is also explained why atmosphere should be represented by an open non-equilibrium system of gas and radiation. Difference between physical processes in the above mentioned system and equilibrium atmosphere is given. The modification of equations of non-equilibrium thermodynamics for a system of gas and radiation is proposed. Possible ways for further development of tools of non-equilibrium thermodynamics are considered.

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Solar terminator and dynamic phenomena in the atmosphere: A review

Cited by 36 publications

References 36 publications

Statistical study of large‐scale traveling ionospheric disturbances generated by the solar terminator over China

Statistical study of large‐scale traveling ionospheric disturbances generated by the solar terminator over China

Solar Terminator Waves in Surface Pressure Observations

Solar radiation and atmospheric dynamics

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