De la mesure du contenu électronique intégré appliquée à l'observation des ondes de gravité de moyenne échelle

Bertel, Louis; Bertin, F.; Testud, J.

doi:10.1016/0021-9169(76)90092-1

Cited by 21 publications

(11 citation statements)

References 14 publications

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“…For convenience of presentation, we will be using values of phase as well as TEC. The correspondence of space-time phase characteristics, obtained through transionospheric soundings, with local characteristics of disturbances in the ionosphere, was considered in detail in a wide variety of publications (Bertel et al, 1976;Afraimovich et al, 1992;Mercier and Jacobson, 1997) and is not analyzed at length in this study. The most important conclusion of the cited references is the fact that, as for the extensively exploited model of a "plane phase screen", disturbances I (x, y, t) of TEC faithfully copy the horizontal part of the corresponding disturbance N(x, y, z, t) of local concentration, independently of the angular position of the source, and can be used in experiments on measuring the wave disturbances of TEC.…”

Section: Determining the Dynamic Characteristics Of Iids By The Sadm-mentioning

confidence: 99%

Isolated ionospheric disturbances as deduced from global GPS network

2004

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Abstract.We investigate an unusual class of medium-scale traveling ionospheric disturbances of the nonwave type, isolated ionospheric disturbances (IIDs) that manifest themselves in total electron content (TEC) variations in the form of single aperiodic negative TEC disturbances of a duration of about 10 min (the total electron content spikes, TECS). The data were obtained using the technology of global detection of ionospheric disturbances using measurements of TEC variations from a global network of receivers of the GPS. For the first time, we present the TECS morphology for 170 days in 1998-2001. The total number of TEC series, with a duration of each series of about 2.3 h (2h 18m), exceeded 850 000. It was found that TECS are observed in no more than 1-2% of the total number of TEC series mainly in the nighttime in the spring and autumn periods. The TECS amplitude exceeds the mean value of the "background" TEC variation amplitude by a factor of 5-10 as a minimum. TECS represent a local phenomenon with a typical radius of spatial correlation not larger than 500 km. The IID-induced TEC variations are similar in their amplitude, form and duration to the TEC response to shock-acoustic waves (SAW) generated during rocket launchings and earthquakes. However, the IID propagation velocity is less than the SAW velocity (800-1000 m/s) and are most likely to correspond to the velocity of background medium-scale acoustic-gravity waves, on the order of 100-200 m/s.

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Section: Determining the Dynamic Characteristics Of Iids By The Sadm-mentioning

confidence: 99%

Isolated ionospheric disturbances as deduced from global GPS network

2004

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“…The method for simulating TEC perturbations is presented in Mercier (1996) and is similar to that developed by Bertel et al (1976). It uses the theory of Volland (1969a) which includes the e ects of thermal conduction (but not of ion drag) on AGW dissipation, and assumes WKB approximation to be valid for describing propagation in a non-isothermal and strati®ed medium (Volland, 1969b).…”

Section: The Simulation Modelmentioning

confidence: 99%

“…However, it was shown by Bertel et al (1976) that the line-of-sightintegrated response in TEC is highly anisotropic, i.e. the amplitude of the observed e ects depends strongly on the relative geometry of the AGWs and of the line of sight.…”

Section: Introductionmentioning

confidence: 99%

“…in the case of geosynchronous satellite-borne beacons. Bertel et al (1976) developed a method to simulate TEC perturbations due to waves with known parameters. This method, involving the WKB approximation, takes into account the dissipation of AGWs due to thermoconduction and (although not formally) to viscosity at ionospheric heights.…”

Section: Introductionmentioning

confidence: 99%

“…This method, involving the WKB approximation, takes into account the dissipation of AGWs due to thermoconduction and (although not formally) to viscosity at ionospheric heights. Bertel et al (1976) used the results of their simulation to discuss their observations of Faraday rotation of signals from a geosynchronous satellite. Mercier (1996) developed a similar simulation to discuss his interferometric observations of several cosmic radio sources.…”

Section: Introductionmentioning

confidence: 99%

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Observations of atmospheric gravity waves by radio interferometry: are results biased by the observational technique?

Jacobson¹

1997

Ann. Geophys.

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Abstract. In this paper we present a quantitative comparison between a large data base of medium-scale atmospheric gravity waves (AGWs) observed by radio interferometry of transionospheric radio sources and the results of a numerical simulation of the observed e ects. The simulation includes: (i) the propagation and dissipation of AGWs up to ionospheric heights and (ii) the calculation of the subsequent slant TEC perturbations integrated along the path to the radio sources. We show that the observed azimuthal distribution of AGWs can be deeply biased. Predicted results are found to be consistent with previous extensive observations using radio beacons aboard geostationary satellites. These observations are rediscussed in view of the present predictions.

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Radio Techniques for Probing the Terrestrial Ionosphere

Hunsucker¹

1991

Physics and Chemistry in Space

105

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De la mesure du contenu électronique intégré appliquée à l'observation des ondes de gravité de moyenne échelle

Cited by 21 publications

References 14 publications

Isolated ionospheric disturbances as deduced from global GPS network

Isolated ionospheric disturbances as deduced from global GPS network

Observations of atmospheric gravity waves by radio interferometry: are results biased by the observational technique?

Radio Techniques for Probing the Terrestrial Ionosphere

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