Study of Geomagnetic Storms, Solar Flares, and Centers of Activity in 1977, the Year of Onset of Solar Cycle 21,

Abstract

Detailed comparison is made between various types of geomagnetic storms, solar flare activity and coronal holes for the year 1977. The Comprehensive Flare Index (CFI), which quantifies x-ray, optical and radio emission, again proves to be an increasing reliable predictor (statistically) of flare-associated geomagnetic storms as the value of the CFI increases. Two sequences of recurrent geomagnetic storms could be associated with coronal holes extending below 30 deg heliographic latitude. The two most active regions of the year resulted in 'flare-sequential' storms in which a coronal hole (and related sequential storms) developed subsequent to the decay of flare production in an adjacent active region. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1981
Accession Number
ADA102301

Entities

People

  • E. Ruth Hedeman
  • Helen Dodson Prince

Organizations

  • Johns Hopkins University

Tags

DTIC Thesaurus Topics

  • Air Force
  • Colorado
  • Cosmic Rays
  • Geophysics
  • Latitude
  • Longitude
  • Magnetic Disturbances
  • Magnetic Storms
  • Physics
  • Physics Laboratories
  • Radio Frequency
  • Security
  • Solar Activity
  • Solar Cycle
  • Solar Flares
  • Space Environments
  • United States

Readers

  • Solar Physics
  • Space/Atmospheric Physics.