Showing papers in "Journal of Atmospheric and Solar-Terrestrial Physics in 1967"

TL;DR: In this article, the global atmospheric wind system produced at different local times by pressure gradients in the upper atmosphere is calculated using data from Jacchia's model atmosphere, and it is suggested that these may readily explain many anomalous ionospheric observations including the midday bite-out, some features of the maintenance of the night-time ionosphere, and the universal time effects observed in the high-latitude ionosphere.

TL;DR: In this article, the effect of a particular static model of the thermosphere on the meridional component of a wind system is discussed, in view of its possible influence on the ionospheric F 2-layer.

TL;DR: In this article, the results of calculations of Schumann Resonance frequencies and Q -factors and the propagation constant of the terrestrial waveguide at extremely low frequencies (e.l.f.) are reported.

TL;DR: In this article, numerical solutions to the set of first-order differential equations which govern the Earth's electric field near the surface are obtained by the Runga-Kutta method.

TL;DR: In this paper, an implicit numerical method is used to solve the system of these equations, which indicates that the atmospheric diffusion and mixing play an important role in determining the [O] and [O2] distributions.

TL;DR: In this article, the lower parts of the D-layer at solar zenith angles 80° < χ < 100° allow the detection of an electron precipitation of low intensities, which is observed on a couple of days after periods when a storage of high energy particles in the Earth's environment is expected.

TL;DR: In this article, a methode bistatique utilisant l'emission d'une onde entretenue, nous avons obtenu depuis le debut de 1966 des spectres de diffusion incoherente entre 90 and 550 km, and nous montrons egalement que le rapport T e T i des temperatures electronique and ionique est compris entre 1 and 1,1 au cours de la nuit avant le debut du phenomene mentionne ci-dessus.

TL;DR: In this paper, it is suggested that auroral zone perturbations are a possible generating mechanism for atmospheric gravity waves which then propagate in a southeasterly direction over great circle paths exceeding 5000 km and are manifested as large TIDs observed by the Boulder scan-backscatter sounder.

TL;DR: In this article, the authors studied the winter radio absorption anomaly at middle latitudes theory in terms of temperature and nitric oxide distributions in the D region of the United States, and showed that the distribution of the absorption anomaly in D region is similar to the distribution in other regions of the world.

TL;DR: In this paper, the relationship between the most commonly used measures of scintillation depth was deduced assuming that the probability density of amplitude distribution is Nakagami's m-distribution.

TL;DR: In this article, the behavior of the ionosphere during five different storms is discussed; certain features of the observed behaviour appear so consistently that it seems possible to make several generalizations about the storm behaviour of the topside ionosphere.

TL;DR: In this article, the authors investigated the validity of the Martyn theory for the formation of the equatorial anomaly using data obtained from the topside sounder satellite Alouette 1 and from ionospheric and magnetic ground stations.

TL;DR: In this article, the authors used IGY data from eight South American stations covering a latitudinal range of approximately 35° to study the equatorial electrojet and found that the space gradients of Sq(H) were appreciable at latitudes just beyond those normally regarded as constituting the electrojet zone.

TL;DR: In this paper, the results of 15 months observations of the ionospheric electron content made at Kiruna, Sweden are presented using the 40 and 41 MHz beacon of the S-66 satellite.

TL;DR: The average value of the diffusion coefficient at the layer peak derived from the hmF2 variations on the assumption that they are entirely caused by drifts is 2·2 × 1010cm2sec−1, which is in good agreement with the appropriate theoretical value as discussed by the authors.

TL;DR: In this article, measurements of the amount of scattering produced by the atmosphere from an intense light-beam projected vertically from a ruby laser have been made in Kingston, Jamaica, and it has been shown that the scattering observed from heights up to eighty kilometres may be interpreted principally in terms of Rayleigh scattering from atmospheric molecules.

TL;DR: In this paper, it was shown that the total magnetic flux in the tail varies by a factor of two or more, which may explain visual auroras, the geomagnetic ring current and some changing patterns of the ionospheric current system.

TL;DR: In this paper, the correlation results give the relations between various parts of the S q currents, and individual cases so far demonstrate that changes in the strengths of the electrojet and world-wide S q current are sometimes independent and sometimes inversely related.

TL;DR: In this paper, the extent of thermal non-equilibrium in the ionosphere, during sunspot minimum, was examined using electron temperatures derived from ionosonde-backscatter comparisons and backscatter spectra.

TL;DR: In this article, the instability of field aligned ionization irregularities in a vertical gradient of ionization under the conditions existing in the E-region of the ionosphere is investigated, and it is concluded that, at the magnetic equator, the normal Eregion is unstable for irregularities of scale sizes 20 m-6 km.

TL;DR: In this article, ground-level magnetic field measurements of the equatorial eleotrojet are reviewed and discussed, focusing attention on the better methods used for analysing ground level magnetic field.

TL;DR: In this article, it was shown that closely spaced receiver drift measurements at low frequencies are a useful technique for continuous observation of night-time drift motions in the lower ionosphere, with a strong semi-diurnally rotating drift component superimposed.

TL;DR: In this article, the appearance of fast regular scintillation of v.h.f. signals received from earth satellites has been distinguished from signals often associated with an irregular ionospheric diffracting phase screen.

TL;DR: In this article, the phase velocity and attenuation of radio waves in the frequency range 40 c/s-10 kc/s were calculated from magnetic tape from two broad-band receivers 285 km apart in the United Kingdom, and from photographs of the waveforms, the Fourier phase and amplitude spectra of the pulses were computed.

TL;DR: In this paper, it was shown that the Doppler shift experienced by radio waves propagating through a slowly varying ionosphere in which collisions are neglected, is given by δƒ = − ƒ c ∫ ∂μ ∂t cos αds provided the ray path satisfies a number of additional requirements usually met in practice.

TL;DR: In this paper, a study has been made of the features of the electrojet currents on a number of individual Quiet Days during the IGY in South America, using the same data as that used in Part I of this paper, and it is suggested that for some equatorial geophysical studies, it may be necessary to classify the days, or even parts of days, into N-northern type, S-southern type and E-equatorial type, according as the overhead currents for a particular station belong to one or both vortices.

TL;DR: In this paper, balloon observations of X-ray bremsstrahlung in the auroral zone have been found that are coherent over areas of at least several hundred kilometers in both the N-S and E-W directions.

TL;DR: In this article, the authors measured the total ionospheric electron content continuously since September 1964 by observing the Faraday rotation of a linearly-polarized wave received from the geostationary satellite Syncom III and presented results of one year's observation at the University of Hawaii (20° N) in the form of monthly mean curves.