Photometric Investigation of the Inner Solar Corona Using an Eclipse Plate of 1927 June 29
Open Access
- 1 July 1961
- journal article
- research article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 123 (1) , 61-80
- https://doi.org/10.1093/mnras/123.1.61
Abstract
A number of isophotes of the innermost corona in integrated light has been determined on a very large plate obtained in 1927 by an eclipse expedition of the Hamburg Observatory, using a camera of 20 m focal length and 1 sec exposure time. The corresponding photometric intensities and electron densities could be derived using calibrated photographs of the same corona from other sources. Intensities and their gradients and amplitudes around the limb of the Sun have been determined and graphically represented within the range of 0′.7 to 3′.7 distance from the Sun's limb. Conclusions as to the formation of zones in the innermost corona have been drawn. Finally some measures of an interesting “dome-formation” of this corona are given.Keywords
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