Showing papers in "Journal of Atmospheric and Solar-Terrestrial Physics in 1983"

TL;DR: In this article, a theory for the extraction of r.m.s. velocities of scatterer motions from spectra measured with a Doppler backscatter radar is developed.

TL;DR: Experimental observations and theoretical modelling of the terrestrial mid-latitude trough are reviewed in this paper, where the authors consider an F -layer phenomenon, and its relationships to the lightion trough in the topside ionosphere and to the plasmapause are discussed.

TL;DR: In this paper, the effects of underlying ionization are accounted for by a correction ( ΔM ) to M(3000)F2, formulated in terms of the ratio foF2/foE(x E ).

TL;DR: In this article, the MSIS model predicts a semiannual variation of about ± 25% in TEC at all sites, while observed changes are only about ±8; thus we require some enhanced loss process near the equinoxes, particularly in September and October.

TL;DR: In this article, the occurrence and behavior of 137 MHz VHF amplitude scintillations and associated ionospheric electron content depletions obtained at Arequipa, Peru (16.4°S, 71.5°W, geogr.; 9°S dip) during the recent solar maximum period 1979-1980 are presented.

TL;DR: In this article, a relatively simple steady-state ion-chemical model for the non-auroral D and lower E regions is presented, and the model results are systematically compared to measurements, namely: ion composition, electron density vs solar zenith angle, solar activity, season and latitude.

TL;DR: In this paper, a theory has been developed for extraction of turbulence energy dissipation rates from spectra measured with a radar, and the results were obtained using the large HF array at Adelaide, Australia, primarily during the southern hemisphere winter of 1981.

TL;DR: In this paper, a large number of D and E-region electron density profiles from high latitudes have been analyzed and a mean variation of the density of negative ions has been derived.

TL;DR: In this paper, the mesosphere and lower thermosphere observations made in July and August 1980 at Sheffield (53°N, 2°W), Townsville (19°S, 147°E), and Adelaide (35°S and 138°E) are compared, and a quasi 2-day oscillation is evident in both the Sheffield and Townsville data, which suggests a significant cross-equatorial leakage of the wave from the summer to the winter hemisphere.

TL;DR: In this paper, an attempt has been made to gather all available sets of experimental ground-based remote measurements of high altitude wind, and the collected data span nearly 30 yr and are analysed in terms of seasonal and long-term solar cycle behavior.

TL;DR: This paper examined the role of the F-region dynamo to explain anomalous variations of the magnetic D-component observed by MAGSAT, including the dependence on solar activity and the dependence of solar activity on the magnetic field.

TL;DR: In this article, the distribution globale des atmospheriques provenant d'eclairs was obtenue d'apres des enregistrements HF effectuees a bord de 155b.

TL;DR: In this paper, the enregistrements de Pi 2 a Choutuppal (7°,5 and 149°,3 E) and Etaiyapuram (−0°,6; 147°, 5 E) ainsi que l'Echelle de magnetogramme de AE durant la periode janv.-avril 1976 and on a observe que les Pi 2 apparaissent durant le jour a latitudes equatoriales simultanement avec le debut d'un sous-orage de AE sit

TL;DR: In this article, meteor wind data obtained during the years 1977-1979 have been processed to obtain prevailing 12h, 24h, and pseudo 2 day components and compared with winds measured at other sites.

TL;DR: In this paper, the proportionality between collision frequency and pressure has been derived and found to be in excellent agreement with laboratory data, and some implications of the results are discussed in detail.

TL;DR: In this article, the authors measured the power radiated into the magnetosphere from typical high voltage power transmission lines in Newfoundland due to unbalanced currents flowing in the lines which return through the ground, at harmonics of 60 Hz up to 4.5 kHz.

TL;DR: In this paper, time-dependent solutions of the diffusion and continuity equations for oxygen-hydrogen and sodium constituents are used to examine the characteristics of the height distribution of sodium atoms.

TL;DR: In this article, the Schumann resonance response to atmospheric conductivity perturbations was investigated in terms of external ionization source intensities of GCR, Lyman-α, or solar cosmic or X-rays, or variations in middle atmospheric chemical constituents.

TL;DR: In this article, the horizontal velocity dispersion of medium-scale travelling ionospheric disturbances near the F2 peak height has been carried out using an array of HF Doppler sounders in central Japan.

TL;DR: In this paper, two rockets bearing quadrupole mass spectrometers capable of measuring both positive and negative ion composition were launched from Red Lake, Canada, during the solar eclipse.

TL;DR: In this paper, the authors analyzed wind data collected over Atlanta during the period August 1974-February 1978 using the Georgia Tech Radio Meteor Wind Facility, yielding an average picture of the seasonal behavior of its diurnal tides.

TL;DR: It is for the plasmaspheric flux tube regions of the magnetospheric flux tubes that the greatest likelihood exists for a near-term, complete description of the plasma, since the magnetic field geometry is relatively well behaved and the plasma source and boundary conditions are specifiable with reasonable accuracy as discussed by the authors.

TL;DR: In this article, the authors compared the values of total electron content (TEC) observed at 31°S and those predicted using the Australian Ionospheric Prediction Service's version of the International Reference Ionosphere.

TL;DR: In this paper, a method for quantifying diffusive flows of O + ions in the topside ionosphere from satellite soundings is described, which enables the evaluation of, the field-aligned flux of O+ ions relative to the neutral oxygen atom gas, using MSIS model values for the neutral thermospheric densities and temperature.

TL;DR: The day-to-day variations of the Sq focus are highly correlated with the electrojet enhancements as mentioned in this paper, and the strength of the normal Sq field and electrojet field are not correlated.

TL;DR: In this article, the maximum value of O density was found to be 7 x 1011 cm−3, with a fact or of two uncertainty, and to occur near 95 km.

TL;DR: In this paper, the authors examined the validity of the commonly used QL and QT approximations for the two refractive indices and the two wave polarizations in a cold magnetoplasma.

TL;DR: In this article, the authors investigated the flux and pitch angle distribution of energetic electrons near the loss cone over the energy range 15-300 keV, using measurements on the geosynchronous satellite GEOS-2 at the times of auroral radio absorption events detected by riometers in Scandinavia.

TL;DR: In this paper, the time-dependent equations of continuity and momentum for O +, H + and He + were solved for the section of a mid-latitude flux tube from the lower F 2-region to the equator.

TL;DR: In this article, simultaneous North-South scanning observations of the OI 7774 and 6300nightlow emissions have been carried out at Cachoiera Paulista (geographic coordinates 22.7°S, 45.0°W) in Brazil, to study the tropical F -region dynamics under spread F and no spread F conditions.