The Distribution Of Radio Brightness Over The Solar Disk At A Wavelength Of 21 Centimetres. I. A New Highly Directional Aerial System

Abstract

SummaryA new aerial system of very high resolving power has been designed for use in determining the distribution of radio brightness across the solar disk at a wavelength of 21 cm. Thirty-two aerials with paraboloidal reflectors are evenly spaced in an east-west direction over a distance of about 700 ft., and are connected by a branching system of balanced open-wire transmission lines to a receiver. The aerial system produces multiple beams each 3' of arc wide and spaced 1.7° apart. The rotation of the Earth causes one after another of the aerial beams to scan the disk of the Sun.The record obtained from the radio receiver gives a one-dimensional brightness distribution over the solar disk.

The Distribution of Radio Brightness Over the Solar Disk at a Wavelength of 21 Centimetres. IV. The Slowly Varying Component

“…The 32-element interferometer (Christiansen and Warburton 1953a),_ which was used for the observations desmibed here, produces.a series of, fan.shaped beams,; each 3 min of arc wide and separated by about 1 0 .7 from n~ighbouring beams. The, rotation of the Earth causes these beams to pass across tp,e solar disk, one at a time, so that the Sun is repeatedly strip-scanned.…”

“…The construction of aerial systems of high resolving power-the line array of Covington and Broten (1954) and the, 32-element interferometer of Christiansen and Warburton (1953a, 1953b provided th-e possibility of studying individual regions over a period of many days. The first new opservation with these systems was that there appeared to be a close relation between radio emission and areas of plage faculaire on the solar disk.…”

The Development of High-Resolution Imaging in Radio Astronomy

“…It should be noted that Högbom (1959), as part of his PhD dissertation work, had previously used an array of simple dipole elements to test the principle of supersythesis. Even earlier, O'Brien (1953) in Cambridge as well as Christiansen & Warburton (1953 in Australia used one-and two-dimensional arrays, respectively, for earth-rotation imaging of the sun. However, for these observations the arrays were phased in real time to form fan beams.…”

Радиоизлучение Солнца И Планет

“…Примером такой системы может служить один из многоэлементных интерферометров на волне 21 см, состоящий из 32 параболических антенн, расположенных вдоль линии восток-запад 50 ' 51 . Диаграмма направлен-ности представляет собой совокупность лепестков шириной 3', разделен-ных интервалами в 1,7°.…”