Satellite observations of wave disturbances caused by moving solar terminator

Bespalova, Alla; Fedorenko, A.K.; Cheremnykh, O. K.; Zhuk, I. T.

doi:10.1016/j.jastp.2016.02.012

Cited by 27 publications

(13 citation statements)

References 17 publications

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“…Since we use only measurements under quiet geomagnetic conditions, the auroral origin can almost be safely discarded. On the other hand, the sunset terminator is a stable wave source and can generate a spectrum of GWs varying with altitudes [ Somsikov , ; Bespalova et al , ]. At 200–300 km height, ST‐generated GWs normally have horizontal scales over 1000 km.…”

Section: Discussionmentioning

confidence: 99%

Medium‐scale gravity wave activity in the bottomside F region in tropical regions

Liu

Pedatella

Hocke

2017

Geophysical Research Letters

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Thermospheric gravity waves (GWs) in the bottomside F region have been proposed to play a key role in the generation of equatorial plasma bubbles (EPBs). However, direct observations of such waves are scarce. This study provides a systematic survey of medium‐scale (<620 km) neutral atmosphere perturbations at this critical altitude in the tropics, using 4 years of in situ Gravity Field and Steady‐State Ocean Circulation Explorer satellite measurements of thermospheric density and zonal wind. The analysis reveals pronounced features on their global distribution and seasonal variability: (1) A prominent three‐peak longitudinal structure exists in all seasons, with stronger perturbations over continents than over oceans. (2) Their seasonal variation consists of a primary semiannual oscillations (SAO) and a secondary annual oscillation (AO). The SAO component maximizes around solstices and minimizes around equinoxes, while the AO component maximizes around June solstice. These GW features resemble those of EPBs in spatial distribution but show opposite trend in climatological variations. This may imply that stronger medium‐scale GW activity does not always lead to more EPBs. Possible origins of the bottomside GWs are discussed, among which tropical deep convection appears to be most plausible.

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Section: Discussionmentioning

confidence: 99%

Medium‐scale gravity wave activity in the bottomside F region in tropical regions

Liu

Pedatella

Hocke

2017

Geophysical Research Letters

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“…[8] and on Total Electron Content [9], both of considerable interest for their significant influence on radio transmissions and for the study of the ionospheric effects of seismic activity. Moreover, as demonstrated by [10], over the equatorial region, horizontal and vertical components of AGW phase velocity coincide with horizontal and vertical components of the terminator velocity. For example, in the study of atmospheric gravitational waves, it is important to accurately determine the time, latitudes and altitudes in which the speed of variation of terminator becomes supersonic because in this space-time interval it can generate gravitational waves [1].…”

Section: Introductionmentioning

confidence: 72%

A New Model of Solar Illumination of Earth’s Atmosphere during Night-Time

Colonna

Tramutoli

2021

Earth

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In this work, a solar illumination model of the Earth’s atmosphere is developed. The developed model allows us to determine with extreme accuracy how the atmospheric illumination varies during night hours on a global scale. This time-dependent variation in illumination causes a series of sudden changes in the entire Earth-atmosphere-ionosphere system of considerable interest for various research sectors and applications related to climate change, ionospheric disturbances, navigation and global positioning systems. The use of the proposed solar illumination model to calculate the time-dependent Solar Terminator Height (STH) at the global scale is also presented.Time-dependent STH impact on the measurements of ionospheric Total Electron Content (TEC) is, for the first time, investigated on the basis of 20 years long time series of GPS-based measurements collected at ground. The correlation analysis, performed in the post-sunset hours, allows new insights into the dependence of TEC–STH relation on the different periods (seasons) of observation and solar activity conditions.

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“…Large-scale variations and medium-scale wave packets are space-fixed along the ST line over a distance exceeding 1,600 km. Bespalova et al (2016) and later Fedorenko et al (2017) reported regular fluctuations induced by the solar terminator seen with a predominant wave mode moving synchronously with the terminator within the fluctuation of the neutral thermospheric components, O and N2 measured by satellites, such as Dynamic Explorer 2 and Atmosphere Explorer-E.…”

Section: Gravity Wavesmentioning

confidence: 86%

Ionosphere Influenced From Lower-Lying Atmospheric Regions

Knížová

Laštovička

Kouba

et al. 2021

Front. Astron. Space Sci.

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The ionosphere represents part of the upper atmosphere. Its variability is observed on a wide-scale temporal range from minutes, or even shorter, up to scales of the solar cycle and secular variations of solar energy input. Ionosphere behavior is predominantly determined by solar and geomagnetic forcing. However, the lower-lying atmospheric regions can contribute significantly to the resulting energy budget. The energy transfer between distant atmospheric parts happens due to atmospheric waves that propagate from their source region up to ionospheric heights. Experimental observations show the importance of the involvement of the lower atmosphere in ionospheric variability studies in order to accurately capture small-scale features of the upper atmosphere. In the Part I Coupling, we provide a brief overview of the influence of the lower atmosphere on the ionosphere and summarize the current knowledge. In the Part II Coupling Evidences Within Ionospheric Plasma—Experiments in Midlatitudes, we demonstrate experimental evidence from mid-latitudes, particularly those based on observations by instruments operated by the Institute of Atmospheric Physics, Czech Academy of Sciences. The focus will mainly be on coupling by atmospheric waves.

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Satellite observations of wave disturbances caused by moving solar terminator

Cited by 27 publications

References 17 publications

Medium‐scale gravity wave activity in the bottomside F region in tropical regions

Medium‐scale gravity wave activity in the bottomside F region in tropical regions

A New Model of Solar Illumination of Earth’s Atmosphere during Night-Time

Ionosphere Influenced From Lower-Lying Atmospheric Regions

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