The analysis of temporal variations in regional models of the Sargasso Sea from GEOS-3 altimetry

The dense coverage of short pulse mode GEOS-3 altimeter data in the western North Atlantic provides a basis for studying time variations in the sea surface heights in the Sargasso Sea. Two techniques are utilized: the method of regional models, and the analysis of overlapping passes. An 88 percent correlation is obtained between the location of cyclonic eddies obtained from infrared imagery and sea surface height minima in the altimeter models. This figure drops to 59 percent in the case of correlations with maxima and minima of surface temperature fields. The analysis of overlapping passes provides a better picture of instantaneous sea state through wavelengths greater than 30 km. The variability of the Sargasso Sea through wavelengths between 150 km and 5000 km is estimated at + or - 28 cm. This value is in reasonable agreement with oceanographic estimates and is compatible with the eddy kinetic energy of a wind driven circulation

The Gossner mission to Chota Nagpur 1845-1875 a crises in Lutheran-Anglican missionary policy

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C.T. Elvey (1899-1970)

The death of Dr. C.T. Elvey occurred in Tucson, Arizona, on 25 March 1970. He was Director of the Geophysical Institute of the University of Alaska from 1952 to 1963, Vice-President for Research and Advanced Study from 1961 to 1963, and University Research Professor and Special Assistant to the President from 1963 until his retirement in 1967. ... Dr. Elvey moved to Alaska in 1952 to become Head of the Department of Geophysics and Director of the Geophysical Institute. He personally undertook a study of the morphology of the aurora, contributed to the design of an all-sky camera for the IGY, and formulated a unifying policy for the Institute based on the theme of 'particle bombardment of the atmosphere'. ... His research proposal of 1958 for conjugate point studies proved to be a far-sighted suggestion which gave the Institute a handsome lead in this field; such studies are still in progress at the Institute, though in more elaborate forms today than Chris originally envisioned. In 1961 he created the Advisory Committee which has been influential in determining broad (scientific and other) policies of the Institute over the years. ... The rise of the Geophysical Institute from a small and rather unsettled group early in the 1950's to its position of prominence in high latitude research in the 1960's is surely its own indisputable testimony to effective leadership and scientific direction during the intervening decade. He came to Alaska with a distinguished career already behind him, yet he carved a new career in the far North. Chris Elvey will be missed by his colleagues round the world, by the many friends he made in Alaska and especially by those of us who came to know him - and the integrity he stood for - so well

The Wide Field Imaging Interferometry Testbed

We are developing a Wide-Field Imaging Interferometry Testbed (WIIT) in support of design studies for NASA's future space interferometry missions, in particular the SPIRIT and SPECS far-infrared/submillimeter interferometers. WIIT operates at optical wavelengths and uses Michelson beam combination to achieve both wide-field imaging and high-resolution spectroscopy. It will be used chiefly to test the feasibility of using a large-format detector array at the image plane of the sky to obtain wide-field interferometry images through mosaicing techniques. In this setup each detector pixel records interferograms corresponding to averaging a particular pointing range on the sky as the optical path length is scanned and as the baseline separation and orientation is varied. The final image is constructed through spatial and spectral Fourier transforms of the recorded interferograms for each pixel, followed by a mosaic/joint-deconvolution procedure of all the pixels. In this manner the image within the pointing range of each detector pixel is further resolved to an angular resolution corresponding to the maximum baseline separation for fringe measurements. We present the motivation for building the testbed, show the optical, mechanical, control, and data system design, and describe the image processing requirements and algorithms. WIIT is presently under construction at NASA's Goddard Space Flight Center.Comment: 7 pages, 3 figures, IEEE Aerospace Conference 200