Some Statistical Properties of the Decay Phase of SEP-Events

Abstract

Generalized parameters characterizing the state of the interplanetary medium (IM) include the functional form and the rate of decline of charged particle flux in solar energetic particle (SEP) events. The shape of the particle flux decline is of particular importance: power-law time dependence indicates the dominance of diffusive propagation, whereas exponential-law, decline emphasizes adiabatic deceleration and convection. A statistical investigation extended for a long period suggests that about 90% of SEP decays are characterized by exponential declines. Variation of the decay time with energy and angular distance of the observer from the flare are considered as well.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2003
Accession Number
ADA423202

Entities

People

  • E. I. Daibog
  • K. Kechskemety
  • Stephen W. Kahler
  • Yu. I. Logachev

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Convection
  • Coronal Mass Ejections
  • Cosmic Rays
  • Deceleration
  • Energy
  • Magnetic Fields
  • Military Research
  • Nuclear Physics
  • Observation
  • Observers
  • Particle Flux
  • Particles
  • Solar Activity
  • Solar Flares
  • Solar Wind

Fields of Study

  • Physics

Readers

  • Mathematics or Statistics
  • Solar Physics
  • Wave Propagation and Nonlinear Chaotic Dynamics.