Evolution of Abundances and Spectra in the Large Solar Energetic Particle Events of 1998 Sep 30 and 2000 Apr 4

Abstract

The 1998 Sep 30 and 2000 Apr 4 events are both large western solar energetic particle (SEP) events, in which 1 MeV proton intensities exceed 10(expn 3) particles (cm[expn 2] s sr MeV) (expn -1). Yet they exhibit quite different time variations of elemental abundance ratios and energy spectra. Using a model of SEP transport through self-amplified interplanetary Alfven waves, we fit the simultaneous observations of protons and ions of helium, oxygen, and iron. We conclude that wave amplification by high energy protons largely account for the differences in the observed time histories.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2001
Accession Number
ADA596973

Entities

People

  • Allan J. Tylka
  • Chee K. Ng
  • D. V. Reames

Organizations

  • United States Naval Research Laboratory

Tags

DTIC Thesaurus Topics

  • Amplification
  • Charged Particles
  • Convection
  • Cosmic Rays
  • Diffusion Coefficient
  • Energy
  • High Energy
  • Intensity
  • Ion Sources
  • Ions
  • Observation
  • Particle Spectra
  • Particles
  • Personal Information Managers
  • Solar Wind
  • Spectra
  • Transport Ships

Fields of Study

  • Physics

Readers

  • International Relations and Conflict Resolution
  • Materials Science and Engineering.
  • Plasma Physics / Magnetohydrodynamics