154 day solar
periodicity
spaceweb@oulu.fi - last update: 22 December 1998, 2020 UT (RR)
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 preceeding 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 (sunspot areas etc.) |
Lean and Brueckner, 1989; Lean, 1990 |
F10.7 |
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.
See also