Landform investigation utilizing digitally processed satellite thematic mapper imagery

The potential of remotely sensed imagery for Earth science applications has been widely recognised for many years. However, with the advent of space borne sensors, a totally new perspective from which to view the Earth's surface has been available to such disciplines as geology and geography. Primary in this development was the deployment of the Landsat series of Earth observation satellites with their multispectral scanning capability. Although standard single band imagery and false-colour composites contain much geomorphological detail, a great deal more information can be extracted from the digital output of such scanners if the data is subjected to computer-assisted image processing.     

THE SAN JUAN CAPISTRANO METEORITE

The San Juan Capistrano chondrite fell on 15 March 1973; the total recovered mass was 56 g. Electron microprobe, chemical and petrographic studies show it to be a member of the H group and of petrologic type 6. Rare gas studies show that only minor radiogenic gas loss has occurred and yield a K-Ar age of 4.6 × 10⁹ years and a Kr-Kr exposure age of 29 × 10⁶ years.     

Laboratory Measurement and Correction of Thermal Properties for Application to the Rock Mass

The requirement for quantitative thermal property data in assessing the performance of an engineered repository is identified. Experimental methods for the measurement of thermal conductivity, thermal expansivity and heat capacity are outlined and typical test results are presented for two rock-types of interest in relation to the Sellafield site. The controls on the thermal properties are discussed and a series of corrections from the rock material to the rock mass properties are presented. Finally, a correction scheme that accounts for the effect of scale is followed.     

A quantitative evaluation of the uniformity of the light scattering properties of the lunar surface

A catalogue was compiled in the author's previous paper (Jones, 1969) of the relative brightness of 199 lunar features as observed at phase angles of 2°.1, 17°.5, 32°.5, 46°.2, 59°.4 and 72°.1 before full Moon, in the wavelength interval 5500 to 7000 Å. The present paper is concerned with an interpretation of this data in terms of the uniformity of the photometric function of the lunar surface. If due account is taken of the effect of second order scattering it is found that all the survey points studied scatter light according to the same photometric function independent of the type of terrain on which they are located.Now at the National Institute of Oceanography, Wormley, Surrey, England     

A comparison of the photospheric and interplanetary magnetic fields during the flight of Mariner IV

The polarity of the interplanetary magnetic field observed by the Mariner IV spacecraft is compared to the polarity of the photospheric magnetic field observed with the solar magnetograph at Mt. Wilson Observatory. Unlike the results obtained from observations during the flight of IMP-I, these polarities are not well correlated when the photospheric polarity is determined from data along a narrow latitudinal strip. It is suggested that the structure of the interplanetary field is often related to major features in the photospheric field that are observed over a broad range of solar latitudes.     

Non-divergent oscillations in the solar atmosphere

Non-divergent oscillations having the form of deep water waves are shown to form normal modes or free oscillations of the solar atmosphere under two approximations: the chromosphere-coronal interface behaves like a free surface, and the density scale height is sufficiently large in the convective zone. These modes show the temporal and spatial characteristics of the 300 second chromospheric oscillations.     

ADELAIDE AND BENCH CRATER — MEMBERS OF A NEW SUBGROUP OF THE CARBONACEOUS CHONDRITES

The composition and mineralogy of Bench Crater and a new carbonaceous chondrite (Adelaide) are compared. They, Kakangari and possibly certain carbonaceous xenoliths from other meteorites constitute a distinct chemical subgroup of the carbonaceous chondrites characterized primarily by a calcium-to-aluminium ratio (atomic) of about 0.5. It is proposed to call this group the Kakangari (CK) group     

Scaling-law equilibria for calcium in canopy-type models of the solar chromosphere

Scaling laws for resonance line formation are used to obtain approximate excitation and ionization equilibria for a three-level model of singly ionized calcium. The method has been developed for and is applied to the study of magnetograph response in the 8542 Å infrared triplet line to magnetostatic canopies which schematically model diffuse, nearly horizontal fields in the low solar chromosphere. For this application, the method is shown to be efficient and semi-quantitative, and the results indicate the type and range of effects on calcium-line radiation which result from reduced gas pressure inside the magnetic regions.Operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation.