Showing papers in "Journal of Atmospheric and Solar-Terrestrial Physics in 1963"

TL;DR: The theory of the variation of the depth of amplitude scintillations with the zenith angle of the source is considered in this article, for radio waves received from a star or a satellite.

TL;DR: In this paper, a study of the characteristics of the F 2-region equatorial anomaly in the African, American and East Asian sectors during quiet days of the 1958 equinoxes, particular attention was given to its diurnal development.

TL;DR: In this article, Northern quiet arcs in lower limit of latitude /us sector and its relation to magnetic storms and to the ring current magnetic field intensity are discussed. And the relation between magnetic storm and magnetic storm intensity is discussed.

TL;DR: In this paper, a summary of investigations into the phenomenon of travelling ionospheric disturbances in the F -region made at the Radio Research Laboratories, University of Sydney, Australia is given.

TL;DR: The semi-thickness of the F 2-layer deduced from a parabolic fit to the nose of the electron density distribution with height based on h'ƒ trace at Kokubunji, Japan, was statistically analyzed as mentioned in this paper.

TL;DR: In this paper, it was shown that the extra terms in the diffusion equation, caused by the variation of the gravity component along a line of force (Lyon, 1961), lead to only a slight dip in N max at the equator.

TL;DR: In this article, a comparison of the occurrences of sporadic-E (E sc ) echoes and field-aligned ( E sφ ) echoes from the E -region showed that at certain times of the year at least, there was a significant probability of their simultaneous occurrence.

TL;DR: In this paper, the authors investigated the effect of the moon on the diurnal variation of the geomagnetic horizontal field (H) at Ibadan using magnetograms of 28 months all in the season of Northern Winter.

TL;DR: In this article, the authors analyzed the hydrogen lines in the aurora and determined the directions and energy distribution of incoming protons from the data, and the observations of several authors are reviewed.

TL;DR: In this paper, two models were considered for the height distribution of electron density in the ARDC Model Atmosphere, and the atmospheric conductivities over Fort Churchill at winter-night-time were calculated for each model.

TL;DR: In this paper, the occurrence of short-duration absorption events at Mirnyy, Antarctica has been investigated by means of riometer observations, and the diurnal distribution of the events is found to change with the season, the majority occurring by night in winter but by day in summer.

TL;DR: In this article, a tentative theory is proposed for the enhancement of sudden commencements of geomagnetic storms near the magnetic equator, where the principal idea is that the equatorial electrojet which has been invoked to explain the large amplitude of the quiet day daily variation in the (magnetic) equatorial regions is enhanced at the time of a sudden commencement (sc) of a Geomagnetic storm, which yields an increase in the ionospheric electrical conductivity and accordingly in the intensity of the electrojet.

TL;DR: The daytime aurora was detected from the ground using a spectral scanning polarimeter employed earlier for measurement of the day airglow Observations made at Fort Churchill, Manitoba during December 1962 revealed intensities for the green (5577 A) and red (6300 A) lines of oxygen of up to 30 kR on a magnetically disturbed day as mentioned in this paper.

TL;DR: In this paper, it was shown that when sound waves travel at right angles to the magnetic field in the lower E -region near the earth's magnetic equator, marked build up of electron density irregularities is possible.

TL;DR: In this article, data from seven stations ranging in magnetic dip from 0° to 44°N have been analyzed to study night time and seasonal variations of spread-F through nearly half a solar cycle.

TL;DR: In this article, the mean scattering cross-section of an electron in incoherent backscatter from the ionosphere has been measured with an accurately calibrated radar, and it was found that the measured crosssection at the F2-maximum exhibits a strong diurnal variation with a maximum value of about half the classical electron cross-sections occurring during the night hours.

TL;DR: In this paper, the authors used very small variations of auroral type absorption in the twilight periods to study the height distribution of the ratio of the densities of negative ions and free electrons and found that the electron density is appreciably increased when the 70-100 km altitude range is illuminated by visual or near ultraviolet light but not by ionizing far ultraviolet radiation.

TL;DR: In this paper, an analogue computer is used to trace acoustic-wave ray paths to altitudes in excess of 300 km, in which the velocity of sound is that implied by the 1959 BAMIRAC model atmosphere.

TL;DR: In this paper, the maximum electron density in the E-layer, Nm(E), is not uniquely determined by the sun's zenith distance, χ, being less in local summer than in local winter under conditions of constant χ.

TL;DR: In this paper, a number of parameters describing the luminosity profile of the airglow 6300 A [OI] emission have been theoretically calculated for magnetically quiet conditions.

TL;DR: In this paper, the percentage occurrence data of midday E s (percentage of times FE s > 5 Mc/s) for thirty-three stations in different regions of the globe were examined in relation to the solar activity for the period 1953-1959.

TL;DR: In this paper, a pair of nearly-conjugate stations inside the north and south auroral zones have been analyzed during periods of polar cap absorption in 1961 and found that the absorption of cosmic radio noise is nearly the same at the two stations provided they are under similar conditions of solar illumination, indicating similarity of the incoming particle flux at conjugate points.