Abstract
A conspicuous coronal dome formation around a prominence was photographed during the eclipse of 15 February 1961 with the 120-cm reflector of the Haute Provence Observatory with an excellent image definition. A detailed isophotic map of the dome formation was constructed after estimating a calibration curve. The bright dome is interpreted as an aggregate of free electrons trapped in a gigantic bundle of magnetic lines of force. The free electrons are concentrated in the central part and the degree of concentration seems to be the least at the top of dome and to increase with decreasing height. The bright dome surrounds a dark one. The minimum extension of the dark dome formation along the line of sight is estimated. It seems that the density of coronal matter is much reduced around the prominence compared with the overall coronal density.
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