A search for the 154 day periodicity in the occurrence rate of solar flares using Ottawa 2. 8 GHz burst data, 1955-1990
- Tufts Univ., Medford, MA (USA) USAF, Geophysics Laboratory, Hanscom AFB, MA (USA)
The Ottawa 2.8 GHz burst record from 1955 January to 1990 February has been examined for evidence of a periodicity near 154 days in the occurrence rate of solar flares. This periodicity is found to be statistically significant, at the 1-percent level, only for the years from 1978 to 1983, corresponding to the activity maximum of solar cycle 21. Through 1990 February, the Ottawa data show no evidence for a 154 day period in the current 22d solar cycle that began in 1986 September. A spectral peak near 51 days is found in solar cycle 19 (1955-1964), as had been previously reported based on an examination of CFI data, but its significance is low, at the 33-percent level. It is concluded that, other than for the period in cycle 21 in which it was first discovered, the evidence for the 154 day periodicity from flare-related data sets is contradictory and not compelling. Stronger evidence for the occurrence of the 154 day periodicity outside cycle 21 can be found in recent studies that examine parameters such as sunspot counts and areas that characterize solar active regions. 29 refs.
- OSTI ID:
- 5701894
- Journal Information:
- Astrophysical Journal; (USA), Vol. 370; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
SOLAR FLARES
VARIATIONS
GAMMA SPECTROMETERS
MICROWAVE RADIATION
SOLAR ACTIVITY
SOLAR CYCLE
SOLAR FLUX
SOLAR PROTONS
SOLAR RADIO BURSTS
STATISTICS
BARYONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
HADRONS
MATHEMATICS
MEASURING INSTRUMENTS
NUCLEONS
PROTONS
RADIATIONS
RADIOWAVE RADIATION
SOLAR PARTICLES
SOLAR RADIATION
SPECTROMETERS
STELLAR RADIATION
640104* - Astrophysics & Cosmology- Solar Phenomena