A 154-Day Periodicity in the Occurrence Rate of Proton Flares

Abstract

We have analyzed periodicities in the occurrence rate of proton flares for solar cycles 19 through 21 (1955-86) 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. Keywords: Solar activity, Sunspots, Astrophysics, Periodic variations, Proton flares, Sun.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1989
Accession Number
ADA219333

Entities

People

  • E. W. Cliver
  • Tingyu Bai

Organizations

  • Stanford University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Data Sets
  • False Alarms
  • Grids
  • Hard X Rays
  • Information Science
  • Measurement
  • Monte Carlo Method
  • Peak Values
  • Periodic Variations
  • Phase Diagrams
  • Phase Shift
  • Power Distribution
  • Power Spectra
  • Solar Activity
  • Solar Cycle
  • Time Intervals
  • X Rays

Readers

  • Mathematics or Statistics
  • Solar Physics

Technology Areas

  • Space