The Fine Structure of the Solar Chromosphere.
Annual rept. no. 3, 1 Aug 71-31 Jan 73,
APPLIED SCIENTIFIC RESEARCH CORP OF THAILAND BANGKOK
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The design, construction and details of a 150 mm f10 solar chromospheric telescope recently installed at the Department of Physics is described. The optical components, the Zeiss H-alpha Monochromator and the Acme cinecamera are placed on a 2.30 meter long spar mounted equatorially. Motion in hour angle is powered by a synchronous motor, while guiding is done through a set of differential gear driven by a servomotor responding to an error signal from the Zeiss Photoelectric Sun Guiding Tube. This also controls guiding in the declination axis. The telescope performs satisfactorily and is in continuous operation in the time-lapse cinematographic mode. The results of reduction of the data obtained in 1971 are presented. Isophotometric studies of the limb photographs confirm that bright mottles inside the limb corresponds to spicules just outside. On the disk, more evidences are obtained in contradiction to the idea that dark mottles are spicules. The bright streaks discovered by Bhavilai 1968 are confirmed. Apparent material motions in loops are found between dark mottles near the solar limb. Author