Periodicities of the flare occurrence rate in solar cycle 19

Journal Article · Wed Jul 01 00:00:00 EDT 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/184943· OSTI ID:6016689

Bai, T

The occurrence rate of major flares during solar cycle 19 has been analyzed. A periodicity of 51 d is found, which is one-third of the period found from the flare rates of solar cycles 20 and 21 by various authors. The statistical significance of the periodicity is estimated to be at 99.85-percent confidence level. This periodicity is though to be related to the 153-d periodicity. The template of the phase diagram is well described by a constant plus a sine function. Additionally, an 18-month periodicity is found in the flare rate of the northern hemisphere. 17 references.

• Research Organization: Stanford Univ., CA
• OSTI ID: 6016689
• Journal Information: Astrophys. J.; (United States), Vol. 318
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
SOLAR CYCLE
SOLAR FLARES
MONTE CARLO METHOD
NORTHERN HEMISPHERE
PHASE DIAGRAMS
SOLAR ACTIVITY
STATISTICS
VARIATIONS
X RADIATION
DIAGRAMS
EARTH PLANET
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
MATHEMATICS
PLANETS
RADIATIONS
640104* - Astrophysics & Cosmology- Solar Phenomena