H-Alpha Profiles from Electron-Heated Solar Flares.

Abstract

Review briefly the status of models of optical flare heating by electron bombardment. Recompute a flare model atmosphere using considerably revised radiative loss rates, based on a method applied to H-alpha, Lyman-alpha, and H(-). Profiles of H-alpha are computed and compared with observation. The computed profiles agree satisfactorily with those observed during the large 1972 August 7 flare, if spatial and velocity inhomogeneities are assumed. The electron injection rate inferred from H-alpha is one order of magnitude less than that inferred from hard X-rays, for this event. This may be due to either the neglect of a mechanism that reduces the thick-target electron injection rate or failure to incorporate important radiative loss terms.

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Document Details

Document Type
Technical Report
Publication Date
Jan 26, 1978
Accession Number
ADA056708

Entities

People

  • John C. Brown
  • Matthew N. Robertson
  • Richard C. Canfield

Organizations

  • University of California, San Diego

Tags

DTIC Thesaurus Topics

  • Air Force
  • Atmospheres
  • Electron Energy
  • Electrons
  • Energy
  • Equations
  • Hard X Rays
  • Ionization
  • Low Temperature
  • Observation
  • Radial Velocity
  • Regions
  • Solar Atmosphere
  • Solar Flares
  • Steady State
  • Sun
  • X Rays

Fields of Study

  • Physics

Readers

  • Computational Modeling and Simulation
  • Solar Physics

Technology Areas

  • AI & ML
  • AI & ML - Bayesian Inference
  • Microelectronics