Confirmation of a 152-day periodicity in the occurrence of solar flares inferred from microwave data
Technical Report
·
OSTI ID:5893570
Evidence for a periodicity of about 155 + or - 5 days in the production of energetic solar flares has been reported by Rieger et al. (1984) and Kiplinger et al. (1984). The data on which these analyses were based are restricted to the years 1980 through early 1984. To see whether this periodicity is a persistent phenomenon, the occurrences of flares inferred from microwave data were exaimned, which are available for most of the present and previous solar cycles. Strong confirmation of a 152-day periodicity was in the time interval previously studied, demonstrating that these flares are a useful indicator for the observed periodicity. Evidence was found persistence of the periodicity in the previous cycle (Cycle 20). In Cycle 20 the periodic modulation of the flare occurrence rate was weaker than in Cycle 21, but the phase has apparently remained coherent through both cycles.
- Research Organization:
- Stanford Univ., CA (USA). Center for Space Science and Astrophysics
- OSTI ID:
- 5893570
- Report Number(s):
- AD-A-163091/2/XAB; CSSA-ASTRO-85-20
- Country of Publication:
- United States
- Language:
- English
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