Confirmation of a 152 day periodicity in the occurrence of solar flares inferred from microwave data

Journal Article · Sun Dec 01 04:00:00 EST 1985 · Astrophys. J., Lett. Ed.; (United States)

DOI:https://doi.org/10.1086/184579· OSTI ID:6225400

Bogart, R S; Bai, T

Evidence for a periodicity about 155 +- 5 days in the production of energetic solar flares was reported in 1984 by Rieger et al. and Kiplinger et al. 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, we have examined the occurrences of flares inferred from microwave data, which are available for most of the present and previous solar cycles. We find strong confirmation of a 152 day periodicity in the time interval previously studied, demonstrating that these flares are a useful indicator for the observed periodicity. We find evidence for 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: Center for Space Science and Astrophysics, Stanford University
• OSTI ID: 6225400
• Journal Information: Astrophys. J., Lett. Ed.; (United States), Journal Name: Astrophys. J., Lett. Ed.; (United States) Vol. 299:1; ISSN AJLEA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DATA
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
FUNCTIONS
INFORMATION
MAIN SEQUENCE STARS
MICROWAVE RADIATION
MODULATION
NUMERICAL DATA
RADIATIONS
SOLAR ACTIVITY
SOLAR CYCLE
SOLAR FLARES
SPECTRAL DENSITY
SPECTRAL FUNCTIONS
STARS
SUN
VARIATIONS