Showing papers in "Journal of Atmospheric and Solar-Terrestrial Physics in 1982"

TL;DR: A model of the O+ and H+ distributions in the plasmasphere and high-latitude ionosphere is described and first results are presented in this paper, where the authors show that a midlatitude trough in F-layer electron concentration is present from 1600 to 0600 LT.

TL;DR: In this article, the authors present further experimental results on ionospheric current modulation, using powerful amplitude modulated HF waves produced by the new heating facility at Ramfjordmoen near Tromso, Norway.

TL;DR: In this paper, the most direct observations to date of suprathermal electrons were reported at Arecibo, transmitting about 140 kW of o-mode power at 7.63 MHz, near but below the ƒ0F2 (exciting strong plasma wave instabilities near an altitude of 285 km) nighttime plasma line intensities were observed to be enhanced by a factor of 10-100.

TL;DR: In this paper, the authors derived the Hough components and mean rate of insolational heating by water vapour absorption in an atmosphere with cloud-related scattering properties and showed that the inclusion of cloud scattering has the notable effect of nearly doubling heating rates at 8 km altitude and of halving values near the surface.

TL;DR: In this paper, the results of several campaigns at the Arecibo Observatory using the new HF high power "heater" facility were presented for detecting VLF/ELF radiation from the ionospheric dynamo current system.

TL;DR: A model of ozone densities based on observational data is presented for each of the four mid-season months January, April, July and October at heights 0(5)80 km and latitudes 0(15)90° as mentioned in this paper.

TL;DR: Tanaka and Venkateswaran as discussed by the authors used the linear theory of cross-field or gradient-drift instability to explain the field-aligned irregularities in middle latitude E s -layers.

TL;DR: In this article, a self-consistently calculated three dimensional ionospheric currents and field aligned currents generated by asymmetrical ionosphere dynamo are calculated self-Consistently, using the assumption of infinite parallel conductivity.

TL;DR: A faintly visible pattern was observed by eye in the northern region (towards the equator) of the clear, moonless sky on one night as mentioned in this paper, but was not due to auroral activity, but was probably caused by the effect of a gravity wave, launched from the troposphere, on the OI 557.7 nm airglow emission.

TL;DR: In this article, thermal excitation of diurnal tides is discussed, and the heat source of excitation is assumed to be localized near the equator, a situation which is based on certain observations of stratospheric tides at Jicamarca, Peru.

TL;DR: In this article, positive ion spectra obtained from measurements with a balloon-borne mass spectrometer during three balloon flights are critically investigated and compared with other data and an upper limit for the number densities of minor constituents such as NH3 and CH3OH is estimated at 35 km.

TL;DR: In this paper, an evaluation of the technique and including a fairly complete discussion of errors involved is presented, and the results are useful down to about 60 km altitude and a minimum density of about 50 electrons cm−3.

TL;DR: In this paper, a two-dimensional computer model of the mesosphere/thermosphere/ ionosphere was designed for the analysis of F-layer depletions produced by rocket launches.

TL;DR: In this paper, a numerical model of F-region heating by high power radio waves is proposed to calculate self-focusing of radio waves for plane waves and beams propagating in an underdense ionosphere.

TL;DR: In this article, the distribution of mesospheric odd nitrogen (NOx) is modeled in the summer and winter hemispheres and the smallest mixing ratios occur in summer where dissociation of NO followed by recombination provides an efficient sink and creates a sharp minimum between 70 and 75 km.

TL;DR: In this paper, it is shown that the tropical F -region ionization structures, variously labelled as bubblebles, plumes, or depletion, can be formed by observing the airglow emissions associated with them in a field aligned direction.

TL;DR: In this article, a numerical simulation of the non-linear evolution of the thermal modulational instability in the F-region of the ionosphere is presented, showing that localized field-aligned density depletions develop which have a width L−T ≅1 m perpendicular to the magnetic field.

TL;DR: In this article, a comparison of the prevailing and tidal wind fields observed in the 80-100 km height region using data obtained with a meteor radar at Kyoto and a partial reflection spaced antenna system at Adelaide is made.

TL;DR: In this article, the authors investigated the ducting of whistler-mode waves by ray-tracing in a magnetospheric model in which multiple and complex duct structures are superimposed on a smooth magnetosphere plasma distribution.

TL;DR: In this paper, the position and dynamics of the poleward edge of the mid-latitude trough over Halley Bay, Antarctica (L = 4.2) is investigated using this method.

TL;DR: In this article, a rocket-borne Langmuir probe was used to obtain measurements of the fine structure of the D-region electron density, and the results showed a small ledge at ~ 81 km, a large and rapid increase in electron density at 83-85 km, and a region of rapid fluctuation at ~92 km.

TL;DR: The directions of propagation in the earth-ionosphere waveguide of multi-component two-hop whistlers recorded on 10 July 1972 by four VLF goniometer receivers in eastern Canada have been determined using the bearings of these great circle paths.

TL;DR: In this article, Saka et al. confirmed the previous result that the D-component amplitude starts to increase with sunrise, and the onset time of the Dcomponent increment coincides with the appearance of the E-layer in the ionosphere within an hour.

TL;DR: In this paper, the authors studied the effect of TIDs on the ionization loss process in a low-latitude station and showed that gravity wave winds of unrealistically large magnitudes are required to explain the observation.

TL;DR: In this article, a survey of stratospheric and mesospheric temperature was performed on a regular basis during winter conditions from the lidar station of the Observatory of Haute Provence (44°N, 6°E).

TL;DR: In this article, the ionospheric effects of the 16 February 1980 solar eclipse in Africa were investigated using the HF Doppier technique. Butler et al. showed that the ionosphere effects of a solar eclipse can be attributed to a travelling coherent structure.

TL;DR: In this article, the possibility of Langmuir soliton formation and collapse during ionospheric modification is investigated, using a combination of analytical and numerical techniques at a spatial location corresponding to the exact classical reflection point of the modifier wave.

TL;DR: In this paper, a simplified analysis is used to study the average behavior of the large-scale ionospheric current paths and examine the interrelationships of various parameters, and the relationship of the parameters of the current deposition regions to the magnetic indices is investigated along with the polar cap potential.

TL;DR: In this article, a case near dawn in which the path structure was particularly simple was analyzed, and the most intense of the three-hop echoes was a mixed-path rather than a single-path component; this was explained by bi-directional coupling between the ducts in both northern and southern conjugate ionospheres.