Evaluation of the vertical flux of energy into the thermosphere from medium scale gravity waves generated by the jet stream

Bertel, Louis; Berttn, F.; Testud, J.; Vidal-Madjar, D.

doi:10.1016/0021-9169(78)90127-7

Cited by 16 publications

(8 citation statements)

References 10 publications

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“…We do not wish to imply that medium scale gravity waves cannot propagate on the dayside. Such waves have been observed frequently from ground-based stations and from satellites, but these waves are, in general, localized and are probably associated with meteorological phenomena [Bertel et al, 1978]. Furthermore, it should be noted that our conclusion about the absence of medium scale waves of auroral origin on the dayside is based upon the data obtained from altitude regions above 230 km.…”

Section: Davis and Da Rosa [1969] From The Study Of Traveling Ionosphmentioning

confidence: 76%

Auroral origin of medium scale gravity waves in neutral composition and temperature

Chandra¹,

Krankowsky²,

Lämmerzahl³

et al. 1979

J. Geophys. Res.

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The kinetic temperature and neutral composition data obtained from the Aeros B neutral atmosphere temperature experiment and the neutral and ion mass spectrometer show spatial structures characteristic of medium scale gravity waves with a wavelength in the range of several hundred kilometers. These waves are associated with auroral activity, and their spatial structure reflects the time history of the auroral electrojet. The medium scale gravity waves tend to propagate to mid-latitudes on the nightside. On the dayside their range is limited to high latitudes. Gravity waves are carriers of auroral energy to middle and low latitudes where they may cause irreversible changes in temperature via viscous dissipation. Since auroral activity occurs frequently, it is suggested that this energy reaches the mid-latitude region of the thermosphere much more frequently than is indicated by planetary magnetic indices.

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Section: Davis and Da Rosa [1969] From The Study Of Traveling Ionosphmentioning

confidence: 76%

Auroral origin of medium scale gravity waves in neutral composition and temperature

Chandra¹,

Krankowsky²,

Lämmerzahl³

et al. 1979

J. Geophys. Res.

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“…We have chosen a single wave with parameters similar to those that have been previously inferred from ground‐based observations at F region heights by Bertin et al [] and Bertel et al [] and which were believed to have their sources in the lower atmosphere. These parameters are also similar to those of Del Genio et al [].…”

Section: Discussionmentioning

confidence: 99%

“…The wave has a phase speed of 100 m s À1 . These parameters are representative of waves observed by Bertin et al [1978] and Bertel et al [1978]. The phase speed is fast enough that vertical wavelengths are long enough to avoid strong scale-dependent dissipation low in the thermosphere and allow penetration of the wave into the region of the thermosphere where composition gradients are largest.…”

Section: 1002/2014ja020583mentioning

confidence: 99%

A full‐wave model for a binary gas thermosphere: Effects of thermal conductivity and viscosity

2015

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The thermosphere is diffusively separated and behaves as a multiconstituent gas wherein individual species in static equilibrium are each stratified according to their individual scale heights. Gravity waves propagating in the thermosphere cause individual gases to oscillate with different amplitudes and phases. We use a two-gas (N 2 and O) full-wave model to examine the roles of thermal conductivity, viscosity, and mutual diffusion on the wave-induced characteristics of both gases. In the lower thermosphere, where the gases are relatively tightly coupled, the major gas (N 2 ) controls the minor gas (O) response. At higher altitudes, the gases become thermally and inertially decoupled, and the wave in each constituent propagates and dissipates consistent with a dispersion relation and vertical scale determined from the constituent scale height. The effects of coupling and diffusion on the relative phases and amplitudes of the fluctuations in each gas are significantly altered by viscosity and thermal conductivity.

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“…To in the source of IGW generation and a variation in the propagation conditions for the waves in the thermosphere. One source that is known to be variable is the generation of waves by meteorological activity [e.g., Munro, 1958;Cowling et al, 1971;Sch6del al., 1973;Bertin et al, 1975Bertin et al, , 1978Shred, 1977, 1982;Rice and Sharp, 1977;Bertel et. al., 1978].…”

Section: Igw Intensitymentioning

confidence: 99%

Investigation of seasonal and interannual variations of internal gravity wave intensity in the thermosphere over Saint Santin

Гаврилов¹,

Richmond²,

Bertin³

et al. 1994

J. Geophys. Res.

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Seasonal and interannuM variations in the intensity of internal gravity waves (IGW) at altitudes of 100-300 km are investigated using measurements of electron density, ion drift velocity parallel to the geomagnetic field, and ion temperature with the Saint Santin incoherent scatter radar between 1967 and 1987. IGW with periods of less than 6 hours produce ion temperature amplitudes of 5-80 K and ion velocity amplitudes along the geomagnetic fidd of 3-17 m/sec. Vertical profiles of IGW intensity have maxima in the altitude regions 140-180 and 250-280 km and vary on annum and interannuM timescales. Usually, the IGW intensity is at its maximum in winter and minimum in summer. Strong interannuM variations are also observed, whose long-term trends sometimes appear to follow the solar cycle, either positively or negatively, but are often irregular. Model calculations show that maxima of IGW intensity during solar minimum can be explained by the diminution of atmospheric density and ion drag, which leads to increased amplitudes of IGW propagating to the thermosphere from lower layers of the atmosphere.

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Evaluation of the vertical flux of energy into the thermosphere from medium scale gravity waves generated by the jet stream

Cited by 16 publications

References 10 publications

Auroral origin of medium scale gravity waves in neutral composition and temperature

Auroral origin of medium scale gravity waves in neutral composition and temperature

A full‐wave model for a binary gas thermosphere: Effects of thermal conductivity and viscosity

Investigation of seasonal and interannual variations of internal gravity wave intensity in the thermosphere over Saint Santin

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