Showing papers in "Planetary and Space Science in 1983"

TL;DR: In this paper, the authors studied the nightside isotropic precipitation of energetic protons during a period of four quiet days using data from the ESRO 1A satellite.

TL;DR: A review of the stratospheric budgets of odd oxygen, odd nitrogen, nitrous oxide, methane and carbonyl sulfide is given in this article, where it is shown that photochemical models and available ozone observations cannot be reconciled and that there may be particularly severe problems in the 25-35 km region.

TL;DR: In this paper, a simple model based upon a Chapman-Ferraro double-dipole model of the magnetosphere was proposed to estimate the field compressions associated with sudden impulses.

TL;DR: In this article, a conservation equation describing the time rate of change of mean molecular weight is derived for a two-species gas, in the presence of molecular and turbulent diffusion and general global circulation.

TL;DR: In this paper, the Schumann-Runge bands (12, 0) through (1, 0), with a 6.65 m photoelectric scanning spectrometer equipped with a 2400 lines mm −1 grating and having an instrumental width (FWHM) of 0.0013 nm, have been obtained from photoabsorption measurements at various pressures throughout the wavelength region 179.3-201.5 nm.

TL;DR: In this article, empirical relations of the North-South component ( ΔH ) of the magnetic disturbance field observed at College with the Pedersen ( Σ p ) and Hall( Σ H ) conductivities deduced from the Chatanika radar data and their ratio (ΔH Σp ) are examined.

TL;DR: In this article, seven polar passes of the NASA Dynamics Explorer 2 (DE-2) satellite during October and early December 1981 have been used to examine the high-latitude circulation in the upper thermosphere.

TL;DR: The results of several TGCM runs are used to show that at F -region heights it is possible to linearly combine the solar-driven and high-latitude driven solutions to obtain the total temperature structure and circulation to within 10-20% as discussed by the authors.

TL;DR: In this paper, a reexamination of the question whether there is enough solar UV radiation and auroral energy input to maintain the observed global mean temperature structure of the thermosphere above 120 km is presented.

TL;DR: In this paper, a detailed study of the morphology of the polarizations of the Pi 2's in and near the westward travelling surge is presented, showing that the poleward Pi 2 has largest amplitudes to the East of the head of the Westward traveling surge.

TL;DR: In this article, an isotropic, spherical, multiple scattering model of the radiation field has been developed to determine the radii at twilight, and the spherical model predicts 10-20% less radiation at all solar zenith angles than the plane-parallel model.

TL;DR: In this paper, the NCAR TGCM was used to calculate the nighttime variation of winds and temperatures over Kwajalein Atoll, Marshall Islands, with a Fabry-Perot interferometer; measurements were obtained during August and September 1977, August 1978, July 1979, and March and July 1980.

TL;DR: In this article, the effect of horizontally varying ionospheric conductivity on the process of magnetospheric Alfven wave reflection was investigated in detail, and it was shown that the reflection process is strongly dependent on the orientation of the wave electric field vector with respect to the boundary between high and low conductivities.

TL;DR: In this article, the authors review and interpret the values of upper-atmosphere rotation rate (zonal winds) obtained by analysing satellite orbits determined from observations, and divide the results according to local time and season, to give the variation of A with height.

TL;DR: In this paper, the authors explored the global extent of the high-latitude troughs from altitudes between approximately 400 and 1100 km using ion composition measurements from the satellite OGO 6.

TL;DR: The severe geomagnetic storm which occurred during 27-29 August 1978 was remarkable because it arrived unexpectedly and was not related to a solar flare or long-lived coronal hole as mentioned in this paper.

TL;DR: In this paper, a model of the thermal plasma at L = 1.4 is presented, where the effects of E × B drift in the meridional plane are investigated.

TL;DR: In this paper, the role of ion-molecule reactions in the conversion of N2O5 to HNO3 was investigated, and the reaction rate constant measurements were made in a flowing afterglow apparatus for hydrated H3O+, H+(CH3CN)m (m = 1, 2, 3).

TL;DR: The most direct measurement of the auroral beam/ionospheric plasma interaction to date was made by as discussed by the authors, who measured energy spectra over a stable auroral arc and calculated auto-correlation functions for 16 energy levels between 300 eV and 19 keV.

TL;DR: In this paper, it is argued that acceleration of the hot magnetospheric ions of ionospheric origin cannot be limited to the outer parts of the field tubes and that the extraction process seems to work below 1000 km altitude in storm conditions and to have a fairly small extension in altitude.

TL;DR: In this paper, a theory for charged-particle collection by a cylindrical conducting object, such as a spacecraft or an electrostatic probe, which is moving transversely through a collisionless plasma, is presented.

TL;DR: In this paper, the authors derived the eigenvalues for quarter-wave toroidal and guided poloidal resonances for a range of L -values and plasma density distributions, and examined three pulsation events with anomalously long periods (when interpreted as half-waves) in the light of these results.

TL;DR: In this article, the sensitivity of the calculated NO density in the lower thermosphere to photolysis of N2 produces translationally excited N(4S) and N(2D) atoms.

TL;DR: Packing forces, produced by an anisotropic sublimation of mantle material of grains located at the surface layer of loosely conglomerated fluffy particles, move the grains towards the center of the fluffy particles as discussed by the authors.

TL;DR: In this article, it was shown that the variation of azimuthal phase velocity with latitude is significantly different for different time intervals during individual events, so that a mean phase velocity for a given latitude cannot be defined.

TL;DR: In this paper, the authors analyzed the stability of the radio fluxes with respect to time and solar activity for the period 1957-1980 and found that between the series of the 3,8 and 10 cm radio flux, no significant trend with time, solar activity or solar cycle exists when mean values for periods of the order of one year are considered.

TL;DR: In this article, a model is proposed to explain the equatorward and poleward movement of the dayside oval in terms of a dayside current system which is intensified by a southward moving of the IMF vector.

TL;DR: In this paper, the wave characteristics of Pc5 magnetic pulsations are analyzed with data of OGO-5, ISEE-1 and -2 satellites, and it is shown that the dominant modes (δBz.dfnc; ∼ δBH >δBD) are mostly observed near the magnetic equator in the duskside outer magnetosphere.

TL;DR: In this paper, the ion distribution function is calculated for the E and the F regions of the auroral latitudes, where the plasma is weakly ionized and there exist convective electric fields which may attain very significant intensities.

TL;DR: In an update of energy characteristics of lightening on Venus obtained from Venera-9 and -10 optical observations, the flash energy was given as 8 × 108 J and the mean energy release of lightnings is 1 erg cm−2 s which is 25 times higher than that on the Earth.