Results 181 to 190 of about 114,060 (217)

The equatorial F-region of the ionosphere

Journal of Atmospheric and Terrestrial Physics, 1960
Abstract A comparison of data from ionospheric sounders at Chimbote and Panama, shows that afternoon critical frequencies in the equatorial zone are negatively correlated with those on the same meridian in the sub-tropical belts. This supports Martyn's suggestion that ionization is transported from the equatorial zone to the sub-tropics.
openaire   +1 more source

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.
openaire   +1 more source

The elongation of irregularities in the equatorial ionosphere

Journal of Geophysical Research, 1963
A correlation analysis of spaced aerial fading measurements for medium-frequency radio waves scattered from the D and E regions at a location near the magnetic equator is reported. The results show that there is a slight tendency towards field-aligned elongation of the diffraction pattern on the ground for echoes from 80 and 90 km and considerable ...
openaire   +1 more source

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’.
openaire   +1 more source

The integrated electron content in the equatorial ionosphere

Journal of Atmospheric and Terrestrial Physics, 1967
Abstract It is shown that an equatorial anomaly exists in the electron content of the topside ionosphere such that the electron content during the early afternoon is greater at latitudes north and south of the magnetic equator than at the equator itself.
J.W. King, E.O. Olatunji, D. Eccles, W.S. Newman   +3 more
openaire   +1 more source

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.
openaire   +1 more source

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.
openaire   +1 more source

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
openaire   +1 more source

Equion, an Equatorial Ionospheric Irregularity Experiment

Journal of Geophysical Research, 1977
Abstract : This paper describes a coordinated rocket and ground based study to investigate Equatorial Spread-F irregularities. Measurements by the Jicamarca backscatter radar, ionosondes, airglow instrumentation and of radio scintillations were correlated with high spatial resolution measurements of electron densities, particle fluxes and VLF-ELF ...
F. A. Morse, B. C. Edgar, H. C. Koons, C. J. Rice, W. J. Heikkila, J. H. Hoffman, B. A. Tinsley, J. D. Winningham, A. B. Christensen, R. F. Woodman, J. Pomalaza, N. R. Teixeira   +11 more
openaire   +1 more source

Equatorial electrojet—II. Use of the model to study the equatorial ionosphere

Journal of Atmospheric and Terrestrial Physics, 1973
Abstract Observations of the electrojet are examined in conjunction with a numerical physical model developed in a companion paper. The model reproduces the basic features of the observed electrojet, but certain discrepancies suggest that the assumptions of the model or the conductivity distributions used may be inaccurate.
openaire   +1 more source