Showing papers in "Journal of Atmospheric and Solar-Terrestrial Physics in 1975"

TL;DR: The theoretical and observational evidence concerning the global propagation of atmospheric gravity waves is reviewed in this article, with special emphasis on the waves generated in the auroral zones, and it is concluded that the only natural sources of large-scale TIDs are in the ionospheric zones.

TL;DR: In this article, a global representation of the large scale variations of ionospheric electron density with the annual, diurnal and solar activity cycles is described, which is particularly suitable for applications in space communication and ionosphere-atmosphere coupling studies.

TL;DR: In this article, current ideas on mechanisms of storm effects in the ionospheric F-layer at mid-latitudes, and of how they depend on the thermospheric circulation are outlined.

TL;DR: In this paper, a review of recent incoherent scatter radar measurements of auroral zone electric fields, conductivities and E-region currents as observed at Chatanika, Alaska is given.

TL;DR: In this article, the pitch angle distribution and energy spectrum of precipitating electrons were obtained by evaluating the overall pitch angle diffusion coefficient due to both wave scattering and atmospheric collisions, and it was shown that electron precipitation is strongly latitude dependent and is insignificant below 45°.

TL;DR: In this paper, a review of the literature in this field is given, and critical remarks about the quality of much of this literature are given, as well as several recent investigations are summarized.

TL;DR: A review of the main phenomena observed by incoherent-scatter observatories, and related to auroral disturbances, or more generally to magnetic substorms, is presented in this article.

TL;DR: In this article, the authors reviewed the subject of joule dissipation of ionospheric currents and movement of the thermosphere by electric fields and compared the depositions of energy into the upper atmosphere by charged particles and electric fields.

TL;DR: In this article, the behavior of the long period waves (greater than one day) or planetary waves and of the tidal components has been studied and a striking similarity appears between the planetary waves at Obninsk and Garchy, and a phase shift between the two determinations has been noticed indicating a longitudinal propagation of these motions.

TL;DR: In this paper, the authors used the Garchy meteor radar data to draw up a detailed picture of the general mean and seasonal averages of the semi-diurnal and diurnal tides in the 80-100 km altitude range.

TL;DR: In this article, the least squares estimation of two parameters (D0 and fHE) in Bernard's (1973) approximation for the dispersion, and of a third parameter locating the causative sferic was used.

TL;DR: In this paper, a new method for direction finding of elliptically polarized VLF electromagnetic waves has been developed, which uses simple algebraic relations between the vertical electric field and the horizontal magnetic fields of the received waves to eliminate TE components of the magnetic field.

TL;DR: In this article, the nonlinear parts of the convective derivative on the resulting wind pattern are considered and a comparison is made with earlier theoretical work and with winds deduced from observations.

TL;DR: In this paper, the authors investigated the extent to which heating of the thermosphere at high latitudes would contribute to the resolution of these difficulties and found that the amount of heating required to make these modifications is consistent with that due to quiet time joule heating.

TL;DR: In this paper, it was suggested that the observed periods were characteristics of the acoustic sources in thundercloud cells and that the smearing of the Doppler records was very common during the occurrence of the (summer) afternoon storms.

TL;DR: In this article, the diffraction pattern resulting from the passage of a plane wave through a onedimensional phase changing screen is considered numerically by exploiting the notion of an angular spectrum of plane waves, and the fast Fourier transform algorithm.

TL;DR: In this paper, the uncertainty in the drift velocities can be optimized by making use of an approach reported by Kirchhoff (1973), which involves a careful selection of the elevation angle of the radar antenna.

TL;DR: In this paper, an extensive comparison of features between the auroral and low-latitude VLF hiss from the morphological standpoint was made, and it was found that the lowlatitude hiss is not considered to be the consequence of the Earth-ionosphere waveguide mode propagation of the aurora hiss and it is totally different from the usual auroral hiss.

TL;DR: An incoherent scatter radar experiment involving the transmission of pairs of short pulses at various spacings was employed at Millstone Hill to study the daytime thermal structure of the lower thermosphere as discussed by the authors.

TL;DR: In this paper, an extension of the numerical model described by Creekmore et al. to treat global wind, density and temperature fields generated by absorption of solar extreme ultraviolet (EUV) radiation is presented.

TL;DR: In this article, the authors analyzed F1-region ion composition in terms of solar zenith angle and seasonal variations to derive a model for use in incoherent scatter radar studies and to deduce corresponding variations in the neutral atmosphere.

TL;DR: In this article, the authors describe the mathematical formulation and implementation of a numerical model of the neutral upper atmosphere based on the equations of conservation of mass, momentum and energy in the altitude range 120-500 km.

TL;DR: In this article, a large gravity wave was observed travelling equatorward from high south latitudes, on one of which there were rotational temperature changes but no gravity waves were apparent.

TL;DR: In this article, the Navier-Stokes equations of the neutral atmosphere between 120 and 500 km are integrated with the inclusion of all nonlinear terms of the convective derivative and the viscous forces due to vertical and horizontal velocity gradients.

TL;DR: In this paper, a simplified D-region ionic model was developed with emphasis placed on obtaining a reasonably accurate evaluation of the free electron concentration, and the precise distribution amongst the multiply hydrated water cluster ions and high affinity negative ions was not considered.

TL;DR: In this paper, a unified picture of the chemistry of the normal and the disturbed D-region is presented under disturbed conditions, including: (a) solar flares, (b) PCAs and (c) solar eclipses.

TL;DR: In this article, it was shown that the fraction of absorbed radiation transferred into the ambient gas by collisions changes significantly with particle size and altitude, and that the dependence of the heating rate, characterizing the exchange of energy between particles and gas, on various factors such as the planetary albedo may have a bearing on upper atmospheric behavior.

TL;DR: In this article, the relationship between electron density profiles and electron temperature profiles in the height range 300-600 km was determined, using incoherent scatter measurements taken at Millstone Hill (U.S.A.), at noon in the years 1965-1968.

TL;DR: The results of eight years of measurements on Whistlermode signals from station NLK (18.6 kHz) propagating in the vicinity of L = 2.5 are presented in this paper.