A 154 day periodicity in the occurrence rate of proton flares

Journal Article · Thu Nov 01 04:00:00 EST 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/169342· OSTI ID:6062337

Bai, T; Cliver, E W ^[1]

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1. Stanford Univ., CA (USA) USAF, Geophysics Laboratory, Hanscom AFB, MA (USA)

We have analyzed periodicities in the occurrence rate of proton flares for solar cycles 19 through 21 (1955 to 1986) and have identified two epochs that exhibit a 154-day periodicity. These epochs are a 14-year interval from 1958 January through 1971 December and a 5.5-year interval from 1978 February to 1983 August. The best-determined period is 154.6. We have found that the phase of this periodicity changed between the above-mentioned two epochs by about one half of a period. It appears that the occurrence rate of proton flares is more sensitive to the 154-day periodicity than the occurrence rate of flares selected by other criteria. 33 refs.

• OSTI ID: 6062337
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 363; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BARYONS
ELEMENTARY PARTICLES
FERMIONS
FOURIER TRANSFORMATION
HADRONS
INTEGRAL TRANSFORMATIONS
NUCLEONS
PROTONS
RADIATIONS
SOLAR ACTIVITY
SOLAR CYCLE
SOLAR FLARES
SOLAR PARTICLES
SOLAR PROTONS
SOLAR RADIATION
STELLAR RADIATION
TRANSFORMATIONS
VARIATIONS