Showing papers in "Journal of Atmospheric and Solar-Terrestrial Physics in 1976"

TL;DR: In this article, the authors investigated the properties of the variation S R in the region of the equatorial electrojet, and the general features of the temporal variations of these parameters.

TL;DR: The list of EUV fluxes presented at the 1969 IAGA review in Madrid (Hinteregger, 1970) has served as a useful reference in many aeronomical studies as mentioned in this paper.

TL;DR: In this article, the authors used the global-scale dynamo solution in Part I to determine a full three-dimensional solution within the equatorial electrojet, showing that vertical currents near the magnetic equator nearly doubled the magnetic variation obtained from the thin-shell dynamo model, relaxing the need for Eregion diurnal wind speeds as large as those required by previous workers to reproduce the S q current system.

TL;DR: In this paper, the E-region dynamo action of combined diurnal and semidiurnal winds consistent with measurements is found to account for the Sq variations in ground magnetic data, without having to resort to electric fields of plasmaspheric origin.

TL;DR: In this paper, a morphological analysis of the magnetic pulsation Pi2 was performed at the ground and by satellites, and the following morphological characteristics of Pi2 were revealed; 1) Pi2 shows a peak amplitude at the auroral oval and a secondary maximum inside the plasmapause latitude, 2.

TL;DR: The results of an examination of the post-storm recovery of the protonosphere and the influence of this on the F2-layer at mid-latitudes are presented in this article.

TL;DR: In this paper, a detailed analysis of the autocorrelation function of the echoes shows the presence of discrete layers of turbulence, with a minimum thickness of a few tens of meters and a minimum separation of about 1 km.

TL;DR: In this article, photo-electric polarimeters with transmission bands centered at 256 nm and 536 nm were flown on ESRO Centaure rocket C-32/2 from Kiruna, Sweden at 2101 Z on 8 June 1968 to investigate molecular scattering in the mesosphere and possible deviations from molecular scattering which existed at the time of flight.

TL;DR: In this paper, a physical model of the equatorial electrojet which includes the effects of ionospheric winds and plasma instabilities is presented. But the model does not take into account the effect of the gradient-drift instability on the electrojet currents.

TL;DR: In this article, the authors investigated the actual action of various factors (asymmetry in the intensity of the total force on either side of the dip equator, shape of the Dip Equator on the meridian of observation, asymmetry of the S R P (H ) on either sides of the centre or value of the s R P( z )) in determining the true centre of the equatorial electrojet.

TL;DR: In this article, a short survey of equatorial spread-F irregularities as observed by means of transequatorial radio propagation is given, where the macro-structure of the equatorial Spread-F appropriately is described by a breaking wave field.

TL;DR: Oscillations observed in the mesospheric velocities measured at Jicamarca, Peru are interpreted to be a manifestation of atmospheric gravity waves of periods 1 hr have amplitudes weaker than those predicted by tidal theory.

TL;DR: The asymmetry of the Earth's plasmasphere in the direction noon-midnight is revealed in this paper, and the possible causes of it are discussed in Section 2.

TL;DR: In this paper, the authors examined the properties of Pc 1 activity observed simultaneously at ATS 1 and two Canadian ground stations and found that IPDP activity follows substorm expansion phase onsets and occurs most frequently at dusk.

TL;DR: In this paper, an analysis of E -region minimum virtual height data obtained from a network of ionosonde stations in the northern hemisphere at mid-latitudes shows the presence of long period (10-15 days) planetary-scale fluctuations for the six-month period, October 1970-March 1971.

TL;DR: In this article, the authors examined the relationship of the diurnal variations of the 5577 A[OI], NaD and OH-band airglow emissions with the upper atmospheric dynamics.

TL;DR: In this paper, the L-shells of the Prognoz satellite were found to be quasi-isothermal and the observed variations of temperature with both L-value and geomagnetic activity were described and discussed.

TL;DR: In this article, the authors used TV records of aurora and induction magnetograms obtained in the southern auroral zone to identify geomagnetic pulsations with periods of a few seconds to several tens of second which often occur in the dawn sector during a post-breakup phase and typically to a quasi-periodic poleward propagation of the on-off switching aurora.

TL;DR: In this paper, the morphology of energetic (≥30 keV) electron precipitation during the growth phase of magnetospheric substorms has been investigated using measurements of auroral-zone bremsstrahlung X-rays obtained from multiple balloon flights and supplementing riometer recordings.

TL;DR: In this article, the influence of magnetospheric parameters (such as cold and hot plasma densities, anisotropy and thermal energy of the hot particles) on the growth rate of ion cyclotron waves is investigated in detail.

TL;DR: In this paper, Equations of motion for ions and neutrals were solved simultaneously using a convection electric field as observed in the polar ionosphere and assuming two different latitudinal variations of ion density.

TL;DR: In this article, the authors considered scattering of radio waves at VHF and UHF frequencies from thermal and non-thermal fluctuations in the mesosphere and developed a model for scattering from nonthermal fluctuation induced by interaction of turbulence with the existing electron-density gradients.

TL;DR: In this paper, the role of three-body attachments to CO2 and N2, and subsequent switching reactions with water vapour, in the successive hydration of NO+ ions are examined.

TL;DR: In this paper, the altitude/latitude/local time variations of H + density during the northern hemisphere summer of 1973 were analyzed using data from the ESRO-4 satellite.

TL;DR: In this paper, the authors used the OGO-5 plasma measurements to determine one component of the electric field of these ULF waves, and thereby to infer that the waves are standing mode oscillations of field lines.

TL;DR: In this article, the authors examined the possibility that magnetospheric processes may, through the direct transfer of magnetosphere energy to the lower atmosphere, be involved in the apparent relationships between solar activity and meteorological phenomena.

TL;DR: In this article, it has been found that a high critical frequency and an extended vertical structure of the sporadic-E layer, as indicated by range spread on ionograms, are linked with scintillation occurrence.

TL;DR: In this article, balloon recordings of bremsstrahlung X-rays supported by recordings of cosmic noise absorption have been used to study in detail energetic (≥30 keV) electron precipitation events occurring near local midnight at the onset of the expansion phase of magnetospheric substorms.

TL;DR: In this paper, an increase in the variance and coherence between layers of temperatures from 100 to 30 mb in the stratosphere over Christchurch (44°S 172°E), and Campbell Island (53°S 169°E) at periods greater than seven days, and particularly in winter.

TL;DR: In this article, a detailed study of the equatorial anomaly, during low sunspot years (October 1962-December 1964), using ƒoF2 data obtained in the American sector by means of the topsidesounder-satellite Alouette 1 shows the seasonal differences in the form and development of the anomaly.