Astrophysical: Sunspot cycle

  • Publication
    Decay rates of sunspot groups from 1874 to 1976
    The global behavior and fine structure of the distribution of sunspot decay rates from activity cycle 13 to 20 are presented. It is shown that the distribution...
  • Publication
    Differential rotation and meridional motions of sunspots from 1874 to 1902
    Position data of sunspot groups from the period 1874-1902 are used to investigate the differential rotation of the Sun and the meridional motions of the...
  • Publication
    Frequency stability of solar oscillations
    An attempt is made to explain conflicting experimental data recently obtained concerning the frequency stability of solar oscillations. Extensive data obtained...