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The 154 day periodicity in the Sun was first reported on gamma-ray flares (Rieger et al., 1984). Later the same periodicity has been found in many other paremeters related to Sun and solar wind/IMF, although it does not seem to be a persistent periodicity, and the exact period varies between 140 and 170 days. For example, Cane et al. (1998) found a 153 day periodicity in IMF strength for solar maximum years 1978-1982, but not for the preceding or subsequent solar cycles. Variables showing ~154 day periodicity:

Variable

Reference

Flare related

Rieger et al., 1984; Bai and Cliver, 1990; Bai and Sturrock, 1993

Active region parameters (sunspots areas etc.)

Lean and Brueckner, 1989; Lean, 1990

Solar F10.7 flux

Lean and Brueckner, 1989

IMF strength and solar wind velocity

Cane et al., 1998

References

  • Bai, T., and E. W. Cliver, A 154 day periodicity in the occurrence rate of proton flares, Astrophys. J., 363, 299, 1990.
  • Bai, T., and P. A. Sturrock, Evidence for a fundamental period of the Sun and its relation to the 154 day complex of periodicities, Astrophys. J., 409, 476, 1993.
  • Cane, H. V., I. G. Robinson, and T. T. von Rosenvinge, Interplanetary magnetic field periodicity of ~ 153 days, Geophys. Res. Lett., 25, 4437-4440, 1998.
  • Lean, J. L., Evolution of the 155 day periodicity in the sunspot areas during solar cycles 12 to 22, Astrophys. J., 363, 718, 1990.
  • Lean, J. L., and G. E. Brueckner, Intermediate-term solar periodicities: 100-500 days, Astrophys. J., 337, 568, 1989.
  • Rieger, E., G. H. Share, D. J. Forrest, G. Kanbach, C. Reppin, and E. L. Chupp, A 154-day periodicity in the occurrence of hard solar flares, Nature, 312, 623, 1984.
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