Showing papers in "Icarus in 1976"

TL;DR: In this article, a theoretical model for the latitudinal structure of alternating zones and belts in the Jovian atmosphere is proposed, based on the theory of convection in rapidly rotating spherical fluid shells heated from within.

TL;DR: In this article, the threshold speeds of particles with different densities were determined as a function of particle diameter and in terms of threshold parameter vs. particle friction Reynolds number in wind-tunnel experiments performed to determine the threshold friction speed of particles.

TL;DR: In this article, a simple earth-analogous Mars degassing model is outlined in which the Martian surface volatile inventory is presumed to be identical to earth's, but scaled to the smaller mass and surface area of Mars.

TL;DR: The distribution of small channels on Mars has been mapped from Mariner 9 images at the 1:5,000,000 scale as discussed by the authors, and the observed distribution may be the result of decreased small-channel visibility in bright areas due to obscuration by a high albedo dust or sediment mantle.

TL;DR: Magnetic field observations made during the third encounter of Mariner 10 with Mercury are discussed along with implications of an intrinsic field for the planetary interior as mentioned in this paper, and it is concluded that an active dynamo is a more likely candidate than fossil magnetization for the origin of the field.

TL;DR: In this paper, a detailed description of a search procedure for radio meteor streams and reports the detection of 275 streams in a synoptic-year sample of 19,698 radio meteors observed by the radar system of the Radio Meteor Project at Havana, Illinois.

TL;DR: In this article, it was shown that solitary waves in a planetary zonal shear have a shape and flow field that are virtually identical to those observed around the Red Spot and numerous other features that have been seen in the Jovian atmosphere.

TL;DR: In this article, the existence of a core, its size, whether it is fluid or solid, the timescale for core formation, the geological consequences of core formation and whether such consequences are consistent with the surface geology.

TL;DR: In this paper, it is suggested that the plains on Mercury may have been formed from impact materials, possibly impact melts or other basin ejecta which behaved more like a fluid than did the lunar ejecta.

TL;DR: In this paper, it was shown that the mediation of the chemical chain that recombines CO2 plays an essential role in regulating the escape of hydrogen to match that of oxygen, confirming a mechanism postulated by McElroy and Donahue (1972).

TL;DR: In this paper, a two-step mechanism is proposed by which small fragments produced by asteroid collisions are gradually sent into eccentric earth-crossing orbits, while the larger parent bodies themselves remain relatively unaffected.

TL;DR: In this paper, a mechanism was proposed to explain the large mean eccentricity and inclination of the early sun by using the second-degree harmonic of the sun's second-order harmonic.

TL;DR: In this paper, the authors examined the factors which affect fusion and evaporation of ice under a variety of Martian surface conditions and found that a frost or ice deposit will pass through a transient liquid phase in temperate latitudes during summer, if the ice is partly or wholly dust covered.

TL;DR: In this article, the characteristics of wind erosion as the dominant process involved in eroding crater ejecta deposits on Mars are studied, and an empirical model is developed for wind erosion of ejecta in nonmantled areas.

TL;DR: In this paper, a model of both ion and neutral chemistry has been employed to compute electron and ion density profiles for three different values of the H2/CH4 abundance ratio.

TL;DR: The photometric precision of the images was shown to be better than 1%. Ratio images calculated by dividing images obtained at two wavelengths (0.40/0.56 and 0.95/ 0.56 microns) are presented for about 50% of the lunar frontside.

TL;DR: In this paper, the threshold wind speeds for setting particles into motion on Mars were estimated by evaluating experimentally observed threshold friction velocities and determining the ratio of this velocity to the threshold speed at the top of earth's atmospheric boundary layer (ABL).

TL;DR: In this paper, a new definition of the Jovian System III longitude measure has been proposed, which has been widely circulated among users and has met with general acceptance, but some errors in current calculations of System III [1957.0] are not noted so that these errors can be avoided in future calculations.

TL;DR: In this article, the photometric behavior of Eros can be modeled by a cylinder with rounded ends having an axial ratio of about 2.3:1, which is representative of an S (silicaceous) compositional type asteroid.

TL;DR: In this paper, a velocity relation for planetesimals which includes an initial velocity component is suggested, which provides a lower bound on the accretion time of the terrestrial planets.

TL;DR: In this paper, a new technique for the interpretation of lava flow morphology was applied to a lava flow on Olympus Mons and the yield stress of the flowing lava was determined subject to uncertainties in the estimates of the slope of Olympus Mons.

TL;DR: In this article, the amount of volatiles incorporated in the Martian regolith by photostimulated oxidation weathering of Fe(2+)-bearing minerals is estimated, and it is noted that all the necessary constituents for this process are present on Mars.

TL;DR: Mariner 10 infrared brightness temperatures of the surface of Mercury at 11 and 45 μm were obtained during the first flyby along a nera-equatorial swath extending from 17 hours local time through local midnight to 9 hourslocal time.

TL;DR: The visible (0.3 to 1.03 microns) spectral reflectances of N2O, NH3, H2S, and NH4HS frosts and mixtures of these frosts as well as their UV-irradiated products have been measured as mentioned in this paper.

TL;DR: In this article, a colonizing, space-faring civilization which exercises population control will colonize the Galaxy in about 5 × 10 6 years, assuming population growth rates and emigration rates appropriate to human experience and a 0.1c ship speed.

TL;DR: In this article, the authors investigated constraints imposed on the ice content of Saturn's satellites and rings by the planet's high luminosity during the early part of its quasi-equilibrium contraction phase.

TL;DR: In this paper, the latent heat of water in Jovian meteorology is reviewed and predictions are made for the other outer planets, and the observed slow variation and two-dimensional character of motions at cloud-top level is explained.

TL;DR: In this paper, the Pioneer 10 and 11 mission was used to investigate the effect of the equator-to-pole temperature difference at the level of infrared emission on the internal heat flux at the poles and equator.

TL;DR: In this article, it was shown that the typical time scale for such outbursts of ionization is estimated to be of the order of 10,000 sec, which is in reasonable agreement with observation.

TL;DR: In this paper, the authors reported that both seasonal and diurnal variations seem to be controlled by insolation rather than by local topography relative to the 6.1-mb surface.