A Dynamic Model for the Transition Region,

Abstract

We develop a model for the lower transition region that can account for the persistent and ubiquitous redshifts that are observed in the UV emission lines formed at these temperatures. We show that these shifts are not likely to be due either to falling spicular material or to steady-state siphon flows. Our model consists of two key ingredients. The redshifted radiation orginates from a minority of flux tubes which have higher gas pressures than their surroundings, and consequently have their transition regions situated below the transition regions of their surroundings. The coronal heating in these loops is impulsive in nature, and this is responsible for the transient mass flows. Our studies, therefore, favor theories for coronal heating which involve flare-like magnetic-energy release. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1982
Accession Number
ADA125046

Entities

People

  • S. K. Antiochos

Organizations

  • Stanford University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Doppler Effect
  • Electron Density
  • Energy
  • Equations
  • Flow
  • Heat Energy
  • Heat Flux
  • High Pressure
  • Line Of Sight
  • Low Temperature
  • Magnetic Fields
  • Materials
  • Observation
  • Radiation
  • Steady State
  • Temperature Gradients
  • Transitions

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
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  • Solar Physics