Results 191 to 200 of about 16,295 (228)

Atmospheric waves and the equatorial ionosphere

Journal of Atmospheric and Terrestrial Physics, 1977
Abstract Rotational effects due to the meridional gradient of the Coriolis parameter produce a class of equatorial gravity waves whose dispersion properties resemble those of acoustic waves. Supersonic sources near the equator should then be able to excite these equatorial waves.
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Topside irregularities in the equatorial ionosphere

Journal of Atmospheric and Terrestrial Physics, 1977
Abstract This paper is a brief review of ionospheric irregularities in the equatorial topside ionosphere. Results from topside sounders, direct measurement satellites, and the Jicamarca incoherent scatter radar are discussed. Scintillation observations and theories of irregularities are not discussed in detail as these are the subject of other review
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Frequency dependence of equatorial ionospheric scintillations

Proceedings / Indian Academy of Sciences, 1978
Simultaneous observations of amplitude scintillations at 40 MHz, 140 MHz and 360 MHz radiated from ATS-6 satellite at 34° E longitude were made at Ootacamund near the magnetic equator in India. It has been found that the frequency variation of scintillation index (S 4) isS 4 ∞f −n , withn being about 1·2 only for weak scintillations, i.e., so long as ...
M R Deshpande, R G Rastogi, Hari Om Vats, K Davies   +3 more
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Dispersive motions in the equatorial ionosphere

Radio Science, 1974
The results of the dispersion analysis of the spaced receiver records of fading for an equatorial station in the Indian zone are discussed. It is shown that the apparent drift speed increases almost linearly with the frequency of fading in all the cases studied for both the E and F regions.
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Ionospheric Perturbation: A Review of Equatorial Plasma Bubble in the Ionosphere

2019 6th International Conference on Space Science and Communication (IconSpace), 2019
Ionospheric irregularities including the Equatorial Plasma Bubbles (EPB), equatorial anomaly, equatorial electrojet and Travelling Ionospheric Disturbances (TID). This paper reviews the irregularities in the ionosphere focused on the EPB. EPB has drawn great interest due to the severe effects of the communications and satellite-based navigation system.
M.H. Mokhtar, N.A. Rahim, M.Y. Ismail, S.M. Buhari   +3 more
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Equatorial ionospheric variations during geomagnetic storms

Journal of Geophysical Research, 1963
During geomagnetic storms, ionospheric short-time electron density variations in the magnetic equatorial zone and low latitudes seem to be characterized by an increase of the maximum electron density of the F/sub 2/ layer. This increase is confirmed by the electron density profile data. Possible causes of the increase are discussed. (auth)
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Equatorial Ionospheric Absorption at Different Longitudes

Nature Physical Science, 1971
IONOSPHERIC absorption measurements by pulse reflexion at vertical incidence were resumed at Ibadan, Nigeria (latitude 7° 26′ N, longitude 3° 54′ E, mag. dip 6° S), in 1966, using frequencies of 2.0–7.5 MHz and taking measurements as far as possible in accordance with the recommendations for the IGY1. Similar measurements were made at Colombo (latitude
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Equatorial hiss in the topside ionosphere

Journal of Geophysical Research: Space Physics, 1979
Equatorial hiss seen in the topside ionosphere by the Dartmouth experiment on Ogo 6, using an electric dipole antenna, is described. The observations are consistent with wave normal positions intermediate between the geomagnetic field and the resonance cone.
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Equatorial Micropulsations and Ionospheric Disturbance Currents

Nature, 1962
THE early evening maximum of occurrence of regular geomagnetic pulsations, pc, of period 20–30 sec., was first detected on the Earth current recordings obtained at Legon, Ghana, during the International Geophysical Year1; but more recently, Cardus2 has confirmed that the occurrence of evening pc is also a feature of micropulsational activity at other ...
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Space Weather in the Equatorial Ionosphere

Space Science Reviews, 2003
The’ scintillations’ observed on signals received in the equatorial region from GPS satellites are due to plasma instabilities in the F region of the ionosphere, also detected as spread F These instabilities give rise to depletions of ionisation or ‘bubbles’.
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