Sommaire

Short-term changes in the colour index of the head and tail of the comet Arend-Roland 1956h
p. 1-6
Periodical changes in the activity of the Encke comet
p. 7-14
Beyer's method of cometary brightness dispersion as a criterion of cometary activity
p. 15-18
New methods of determining the parameters of the photometrical curve of a comet dust-gas model
p. 19-27
Variation of the production of solar radiation during eleven-year cycle of solar activity in the wave-length range 620 Å to 11000 Å
p. 29-55
Dimension of dust particles in a cometary atmosphere
p. 57-75
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