Internal atmospheric gravity waves at ionospheric heights

Hines, C. O.

doi:10.1029/gm018p0248

Cited by 294 publications

(433 citation statements)

References 36 publications

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“…Traveling ionospheric disturbances (TIDs) have been detected with various observational techniques since the 1940s, and have been attributed to the perturbations of the ionized atmosphere modulated by acoustic gravity waves [Hines, 1964] …”

Section: Introductionmentioning

confidence: 99%

Traveling ionospheric disturbances detected in the FRONT Campaign

Saito¹,

Nishimura²,

Yamamoto³

et al. 2001

Geophysical Research Letters

128

154

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Section: Introductionmentioning

confidence: 99%

Traveling ionospheric disturbances detected in the FRONT Campaign

Saito¹,

Nishimura²,

Yamamoto³

et al. 2001

Geophysical Research Letters

128

154

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show abstract

“…By ignoring all sources and loss processes, under the linear approximation, Hines (1960) worked out the dispersion and polarization relations of gravity waves in an isothermal atmosphere, this approach provides the most fundamental base for later studies of gravity waves. Because of the exponential increase of gravity wave-associated disturbance velocities with height, it is believed that the nonlinearity will strongly a ect the propagation of gravity waves in the middle and upper atmosphere.…”

Section: Introductionmentioning

confidence: 99%

The nonlinear effects on the characteristics of gravity wave packets: dispersion and polarization relations

Zhang

Wang

2000

Annales Geophysicae

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Abstract. By analyzing the results of the numerical simulations of nonlinear propagation of three Gaussian gravity-wave packets in isothermal atmosphere individually, the nonlinear e ects on the characteristics of gravity waves are studied quantitatively. The analyses show that during the nonlinear propagation of gravity wave packets the mean¯ows are accelerated and the vertical wavelengths show clear reduction due to nonlinearity. On the other hand, though nonlinear e ects exist, the time variations of the frequencies of gravity wave packets are close to those derived from the dispersion relation and the amplitude and phase relations of wave-associated disturbance components are consistent with the predictions of the polarization relation of gravity waves. This indicates that the dispersion and polarization relations based on the linear gravity wave theory can be applied extensively in the nonlinear region.

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“…Also, as mentioned by Meriwether et al (1997), magnetic activity effects would not produce the form of localized heating which is observed. Hines (1960) drew attention to the importance of atmospheric gravity waves at ionospheric heights. Sources for medium-scale gravity waves include tropospheric distur- bances, such as the jet streams, frontal systems and penetrative convection (e.g.…”

Section: Observations With Temperature Gradientsmentioning

confidence: 99%

Thermospheric zonal temperature gradients observed at low latitudes

2001

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Abstract. Fabry-Perot interferometer (FPI) measurements of thermospheric temperatures from the Doppler widths of the OI 630 nm nightglow emission line have been carried out at Cachoeira Paulista (23 • S, 45 • W, 16 • S dip latitude), Brazil. The east-west components of the thermospheric temperatures obtained on 73 nights during the period from 1988 to 1992, primarily under quiet geomagnetic conditions, were analyzed and are presented in this paper. It was observed that on 67% of these nights, the temperatures in both the east and west sectors presented similar values and nocturnal variations. However, during 33% of the nights, the observed temperatures in the west sector were usually higher than those observed in the east sector, with zonal temperature gradients in the range of 100 K to 600 K, over about an 800 km horizontal distance. Also, in some cases, the observed temperatures in the east and west sectors show different nocturnal variations. One of the possible sources considered for the observed zonal temperature gradients is the influence of gravity wave dissipation effects due to waves that propagate from lower altitudes to thermospheric heights. The observed zonal temperature gradients could also be produced by orographic gravity waves originated away, over the Andes Cordillera in the Pacific Sector, or by dissipation of orographic gravity waves generated over the Mantiqueira Mountains in the Atlantic sector by tropospheric disturbances (fronts and/or subtropical jet streams).

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Internal atmospheric gravity waves at ionospheric heights

Cited by 294 publications

References 36 publications

Traveling ionospheric disturbances detected in the FRONT Campaign

Traveling ionospheric disturbances detected in the FRONT Campaign

The nonlinear effects on the characteristics of gravity wave packets: dispersion and polarization relations

Thermospheric zonal temperature gradients observed at low latitudes

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