Showing papers in "Journal of Atmospheric and Solar-Terrestrial Physics in 1959"

TL;DR: In this paper, a study of cosmic noise absorption at a frequency of 30 Mc/s at Ottawa and Churchill has revealed the existence of two apparently distinct types of abnormal absorption event.

TL;DR: In this paper, an account is given of the photographic registration of the variation of the earth's horizontal magnetic force (H ) across the magnetic equator in Nigeria from November 1956 to January 1957.

TL;DR: In this paper, a least-squares theory is applied to observations on drifting meteor trails to obtain the determination of a general number of parameters, characterizing the wind structure, and the results enable vertical air motion and time and height-variations in wind structure to be examined, whereas previously a constant horizontal wind was assumed.

TL;DR: In this paper, a study of high frequency fading observed on the 40 Mc/s wave radiated from the first Russian satellite (1957α) was made and it was concluded that it was produced by the passage of the waves through irregularities in the F-region of the ionosphere.

TL;DR: In this paper, the authors used weak echoes from the D -region and the measurement of ionospheric wave interaction to determine tentative profiles of electron density and collision frequency for the ionosphere below about 85 km.

TL;DR: In this article, the effect of the equatorial electrojet on the vertical component (Z) of the earth's magnetic field is found to have a maximum value at about 250 km from the jet.

TL;DR: In this paper, a method for finding the variation of electron density with height h in the outer ionosphere was proposed, using successive approximations, when the variations of whistler dispersion with geomagnetic latitude is known.

TL;DR: In this paper, it was shown that the reflection coefficient for waves incident from the west is numerically greater than that for waves reported from the east when the angle of incidence is large.

TL;DR: In this article, the scattering of radio waves in the upper atmosphere during auroral disturbances has been studied by means of a number of radio systems in which each transmitter was separated from its associated receiver by a distance of about 1000 km.

TL;DR: Magnetic records obtained from November 1955 to June 1957 at Ibadan, Nigeria, have been analyzed harmonically for lunar and luni-solar variations as discussed by the authors, and the results are statistically significant.

TL;DR: In this article, a detailed analysis of the normal E-region shows the existence of minor perturbations from the classical Chapman theory, with particular reference to its effect on the values of the parameter ƒ0E at different latitudes.

TL;DR: In this paper, it was shown that in elastic collisions between electrons and nitrogen molecules, the collisional cross-section A is proportional to the speed c of the electron; namely, A = 3·29 × 10 −23 c cm 2.

TL;DR: Auroral spectrograms taken with the IGY patrol spectrograph at College, Alaska, during the great aurora of 10-11 February 1958, show high vibrational excitation in the B( 2 σ u + ) state of N 2 +, as indicated by the enhanced intensities of the 4652 A (1,3) and 4600 A (2,4) bands relative to the 4709 A (0,2) band of the first negative system as mentioned in this paper.

TL;DR: In this article, it is shown how, by considering both the ordinary and extraordinary ray traces on the h′(ƒ) record, it is possible to avoid both these assumptions to a considerable extent, and to deduce something about the electron distribution in the lower ionosphere and in any valley.

TL;DR: In the interval between two consecutive condensations of moisture, atmospheric air accumulates radioactive isotopes produced by cosmic-ray particles in collisions with nitrogen, oxygen and argon as discussed by the authors.

TL;DR: In this paper, the deviative absorption of a radio echo varied with its group path as a critical frequency was approached, and the collision frequency at heights between 105 km and 120 km was found to vary with a scale height of about 16 km.

TL;DR: In this article, it was shown that continental drift is the more satisfactory inference to be drawn from the discrepancies between the polar wandering paths for the different continents, and the possibility that for parts of geological time the mean geomagnetic field has not been dipolar, but has had multipolar components, has not hitherto been discussed.

TL;DR: In this article, the motion of weak irregularities in an otherwise homogeneous slightly ionized gas under the influence of electrostatic and magnetostatic fields is investigated and the governing equations are set out and the dispersion equation for harmonic plane wave solutions is obtained and solved.

TL;DR: In this article, it was shown that there exists a close correlation between bursts in the centimetre range and sudden ionospheric disturbances (SID) recorded during the first 6 months of the IGY, and that only those flares, which give rise to a centimeterre burst, are also able to cause a SID.

TL;DR: In this paper, it was shown that under certain circumstances this could lead to the type of h′(ƒ) curve observed in practice, and it was also shown that the magnitudes of some of the quantities involved must lie within certain ranges.

TL;DR: In this article, the E- and F2-layers of the ionosphere are closely controlled by the level of solar activity but, at any fixed point on the earth's surface, they also vary with season owing to the annual change in the solar zenith angle.

TL;DR: In this article, a new grating spectrograph has been used in the study of the upper atmosphere, and a summary of the results of auroral observations is given, including precise wavelengths of the band lines of the 5,0, 6,1, 8,2 and 9,3 bands of the Meinel OH system, and absolute intensities of the bands.

TL;DR: In this article, a number of observations of nightglow and auroral temperatures made with a photoelectric scanning Fabry-Perot interferometer are presented and discussed, and the results suggest that the temperature of the region emitting the λ5577 radiation lies within the range 180° to 220°K, with a most likely value of 190°K.

TL;DR: In this article, the authors examined spread-f layers at six low-latitude stations in Africa and found that the occurrence of disturbed magnetic conditions inhibited the occurrence during the southern solstice at all these stations.

TL;DR: A spectrum of the early stages of the great aurora of 11 February, 1958, covering the wavelength range 3710-4420 A at a dispersion of 22 A/mm shows several unusual features, such as lines of the 3d-4f transition array of NII which lie at excitation potentials 4·6 eV above those of the usually observed NII lines as mentioned in this paper.

TL;DR: In this paper, a table of coefficients is presented by means of which h −f records may be readily reduced to electron-density-height profiles without the use of computing aids, and the sensitivity of these coefficients to magnetic dip angle and gyrofrequency is discussed.