Showing papers in "Icarus in 1983"

TL;DR: In this article, the Nusselt-Rayleigh number relation is used to model the rate at which heat escapes from the inner core of the Earth and Mars, and the models include realistic pressure and composition-dependent freezing curves for the core, and material parameters are chosen so that the correct present day values of heat outflow, upper mantle temperature and viscosity, and inner core radius are obtained for the earth.

TL;DR: In this paper, the authors investigated the equatorial atmosphere of Titan by means of coherently related radio signals transmitted from Voyager 1 at 13.0 and 3.6 cm wavelengths during the November 12, 1980 occultation of the spacecraft by the Saturn satellite.

TL;DR: In this paper, the authors used the maximum Liapunov characteristic exponent and its importance for determining the character of a trajectory to trace out the chaotic zone near the 3/1 commensurability, both in the planar-ecliptic problem and in the three-dimensional elliptic problem.

TL;DR: In this paper, a one-dimensional photochemical-dynamic model is used to study hydrodynamic loss of hydrogen from a primitive, water-rich atmosphere on Venus, and the escape flux is calculated as a function of the H2O mixing ratio at the atmospheric cold trap.

TL;DR: In this paper, the outer few meters of a comet stored in the Oort cloud for 4.6 billion years were studied in a laboratory experiment designed to simulate the temperature, pressure and radiation environments of the interstellar Oort Cloud region.

TL;DR: In this article, the mass and size distribution of the particles from the rms voltage of the induced noise and the impulse rate were determined based on the assumption that the voltage induced on the antenna is proportional to the mass of the colliding particle, and the results showed that the mass distribution varies as m −3, and most of the detected particles had radii in the range from 0.3 to 3 μm.

TL;DR: In this paper, it was suggested that spokes consist of charged, micron-sized dust particles which are elevated from the rings by radially moving, dense plasma columns due to meteor impacts on the ring.

TL;DR: In this article, the authors constructed a thermal history model for the small, icy Saturnian satellites Mimas, Tethys, Dione, Rhea, and Iapetus, including the effects of radiogenic and accretional heating.

TL;DR: In this article, evidence is adduced for several episodes of geologic resurfacing and extensional tectonism spreading over much of the history of the small, icy Saturn moon Enceladus.

TL;DR: In this paper, the suitability of Europa as a habitat for living organisms was investigated and it was shown that for a plausible physical model of Europa, the general conditions for the survival of biological organisms could exist, at least in some regions, highly restricted in both space and time.

TL;DR: A detached haze layer with peak particle number densities of about 0.2 cu/cm exists at all latitudes south of about 45 N, and at an altitude of 300-350 km.

TL;DR: The theory underlying the determination of the particle size distribution, including differential extinction and inversion of the scattered signal, is presented in this article, and the results for the observed spectra, differential cross sections, suprameter and sub-to-suprameter size distributions are presented.

TL;DR: In this paper, the freezing of small Martian streams is modelled for a variety of climatic conditions, on the supposition that the Martian atmosphere may have been considerably thicker in the past, at the time of the formation of the valley networks.

TL;DR: In this paper, the authors derived the photometric properties of Europa using a linear superposition of a lunar-like scattering law and a Lambert component, which is an adequate simple representation of the scattering properties.

TL;DR: In this article, an analysis of the properties, source regions and deposits of volcanic plumes on Io are presented which suggest the presence of two plume types, Pele-type and Prometheus-type eruptions.

TL;DR: In this article, an automatic search with finite Fourier transforms located 13 density waves excited by resonances with Saturn's satellites and estimated the total ring mass as 5 x 10 to the -8th of the mass of Saturn.

TL;DR: In this paper, the authors investigated the effect of grain size on the strength of absorption features observed in the reflectance of a particulate surface on a planetary surface containing volatile ices and found that the absorption characteristics can change in connection with processes leading to a change in the grain size of the material.

TL;DR: In the case of the radiometer, random instrumental errors are small, and the quoted error in the effective temperature reflects primarily uncertainties in systematic corrections as mentioned in this paper, while random effects are small.

TL;DR: In this paper, a simple analytic theory describing the 1:1 orbital resonance is presented and applied to Saturn's coorbiting pair, 1980S1 and 1980S3, which can approach to within 15,000 km, but are prevented from passing each other by their mutual gravitational interaction.

TL;DR: In this paper, it was shown that even a modest increase in viscosity may be enough to cause a failure of solid state convective self-regulation early in the evolution of a homogeneous, rock-water ice satellite, provided the satellite is large enough and sufficiently silicate rich.

TL;DR: In this article, the dark hemisphere of Iapetus was found to be very red, similar to a few asteroids and the earth's moon, but with no spectral features implying olivine or pyroxene.

TL;DR: In this article, it is suggested that the small-scale structure is produced by a meriodional circulation associated with the dissipative decay of the zonal winds with height, while the hemispheric asymmetry represents a thermal response to the seasonally varying insolation.

TL;DR: In this article, a ring brightness variations are investigated and noted to be caused by vertical corrugations of the local ring plane due to a spiral bending wave, resonantly excited by Mimas, which propagates inwardly by way of the ring particle collective gravity.

TL;DR: In this paper, a qualitative discussion is given of the problem of collisions with minor planetesimals, a process called atmospheric cratering or atmospheric erosion, and a discussion of atmospheric loss accompanying collision of a planet with a major planetesimal, such as may have produced the earth's moon.

TL;DR: In this article, 5 percent-resolution spectrophotometry for the Uranian satellites Ariel, Umbriel, Titania and Oberon cover the 1.43-2.57 wavelength region and confirm the presence of a spectrally dominant water ice component in their surfaces.

TL;DR: In this paper, the possible effects of explosive water vaporization on ejecta emplacement after impact into a wet target are described, based on analysis of Viking imagery of Mars and experimental vapor explosions as well as consideration of fluidized particulate transport and lobate volcanic deposits.

TL;DR: In this article, a growth equation for a mass distribution function is proposed to simulate the accumulation of a gaseous nebula towards the Earth and the formation of a proto-Neptune in 4.6×109 years.

TL;DR: The results from the year 1979 of an ongoing program of asteroid photometry at Table Mountain Observatory are presented in this article, showing the number, name, opposition date, taxonomic class, diameter, absolute magnitude, mean absolute magnitude at zero phase angle and values of the absolute magnitude and linear phase coefficient derived from it, the rotation period in hours, peak-topeak amplitude of variation, difference between mean and maximum brightness, and reliability index.

TL;DR: In this paper, information obtained about Saturn's rings through radio occultation observations with Voyager 1 is discussed, including the positional relationships and relative motions of the spacecraft, rings, and earth, the radio system, observables, microwave opacity, and diffraction.