The Size of Low-latitude Ionospheric Irregularities Determined from Observations of Discrete Sources of Different Angular Diameters PDF Download
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Author: Jules Aarons
Publisher:
ISBN:
Category : Ionosphere
Languages : en
Pages : 8
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Author: Jules Aarons
Publisher:
ISBN:
Category : Ionosphere
Languages : en
Pages : 8
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Author: Donald A. Guidice
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Category : Ionospheric radio wave propagation
Languages : en
Pages : 60
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An investigation of certain discrete radio sources, including the experimental measurement of their flux densities and a theoretical interpretation of their spectra, has been carried out for the 20-40 MHz frequency range. The observations were made at 22.30, 26.70, 33.45 and 38.75 MHz using the 1000-ft radio telescope of the Arecibo Ionospheric Observatory. Descriptions of the observations and the data analysis are given, together with a discussion of the limitations imposed on the measurements by the ionosphere and the radio telescope. The flux densities of eight discrete radio sources at the four operating frequencies, measured relative to Taurus A, are presented. A detailed error analysis was carried out; anticipated errors are given for each flux density value. (Author).
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Category : Nuclear energy
Languages : en
Pages : 1220
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Category : Environmental geology
Languages : en
Pages : 112
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 776
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Author:
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Category : Government publications
Languages : en
Pages : 1288
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Author: Keith H. Lloyd
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Category : Atmosphere, Upper
Languages : en
Pages : 44
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The paper presents the results of observations on a series of releases of barium neutral atoms and ions in the upper atmosphere. One release, at 195 km, is discussed in detail. Because of the effect of winds and the earth's magnetic field on the ionized cloud, the neutral and ionized clouds drifted apart. The diffusion and descent of the neutral cloud allowed estimates of the atmospheric density and scale height to be made; the ratio of the ambipolar diffusion to the neutral diffusion coefficient of the ionized cloud yields the temperature of the atmospheric electrons. These values agree very well with the COSPAR International Reference Atmosphere. The observed drift and descent of the ionized cloud can be explained satisfactorily only if there is an electric field in the atmosphere of 1.1 x 10-3 volts m-1. The ambipolar diffusion perpendicular to the earth's magnetic field was much faster than predicted from molecular diffusion theory, and could be due to a 'Bohm' diffusion caused by plasma instabilities. (Author).
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Category : Aeronautics
Languages : en
Pages : 1076
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 1014
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Author:
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Category : Geomagnetism
Languages : en
Pages : 966
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