The activity of the Jupiter atmosphere has been studied from 1952 to 1964 by J. Focas and C. Banos, who have defined and measured a photometric coefficient of activity "R". Using the values of R derived from the photometric analysis of plates of the National Observatory of Athens by C. Banos and E. Sarris (1962-1985) and the measurements of J. Focas (1915-1963) we have done a mathematical analysis of the coefficient of activity R. We have found the following periodicities of "R" : 22, 8, 4 and we have given an analytical expression of R.
Υπολογίζονται οι περιοδικότητες του δείκτη φωτομετρικής δραστηριότητας R και βρίσκονται ότι αντιστοιχούν σε 22, 8 και 4 χρόνια. Δίδεται επίσης αναλυτική μαθηματική έκφραση του δείκτη R.
