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Summaries are given of research in the following fields: upper atmosphere physics, microwave physics, space physics, terrestrial sciences, optical physics, data sciences, meteorology, solid state, aerospace instrumentation.
This bibliography lists all in-house reports, journal articles, and contractor reports issued from 1 July 1966 to 30 September 1967. Part I lists all in-house reports by the series in which they were issued; Part II lists all in-house reports, journal articles, and contractor reports by the Laboratory responsible for their preparation. In Part I, the reports are listed numerically by series; in Part II, in-house reports and journal articles are listed alphabetically by author, and contractor reports are listed numerically by the AFCRL report number.
Radio coronal condensations during the 20 May 1966 and 12 November 1966 solar eclipses were measured by AFCRL at wavelengths of 3.4, 6.0, 11.1 and 21.2 cm. Almost all condensation regions showed peak flux values lower than 10 to the ( -21)st power w/sq m/Hz. The flux spectra increased very slightly with increasing frequency, suggesting that thermal bremsstrahlung was the dominant emission mechanism. Only one source had a spectrum where gyromagnetic emission became dominant and caused peaking near the 6.0-cm wavelength. This source was associated with the strong bipolar spot group in McMath plage region 8573 of 12 November. A quiet-sun model that was developed to determine the source flux accounted for the east-west asymmetry, limb brightening, and polar darkening in the radio brightness distribution of the background sun. The angular size of sources was smallest, with least variations, at the 6.0-cm wavelength. Brightness temperatures of the condensations were measured at 4,700,000 degrees K (21.2 cm) during both eclipses. Flares, radio bursts, and other electromagnetic emissions originating in coronal condensation regions can cause false signatures on surveillance radars, affect satellite orbit parameters, and create ionospheric disturbances that degrade communications. Knowledge of the condensation region development is needed for early warning and prediction of potential solar disturbances. (Author).