Solar Physics

, Volume 173, Issue 2, pp 243–258 | Cite as

Nonthermal Velocities in the Solar Transition Zone and Corona

  • J. G. Doyle
  • E. O'Shea
  • R. Erdélyi
  • K. P. Dere
  • D. G. Socker
  • F. P. Keenan
Article

Abstract

Nonthermal velocities are presented for spectral lines covering the temperature range 10 4–10 6 K, measured from high-spectral-resolution data for several solar features observed at the limb by the high resolution telescope and spectrograph (HRTS), including a coronal hole, ‘quiescent regions’ and several small-scale active regions. These results are compared with predictions based on acoustic waves and heating via Alfvén waves. It is likely that more than one mechanism is operating simultaneously, in particular, resonant Alfvén wave heating, which is very sensitive to background plasma motions.

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Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • J. G. Doyle
    • 1
  • E. O'Shea
    • 1
  • R. Erdélyi
    • 1
  • K. P. Dere
    • 2
  • D. G. Socker
    • 2
  • F. P. Keenan
    • 3
  1. 1.Armagh ObservatoryArmaghN. Ireland
  2. 2.E. O. Hulburt Center for Space Research, U.S. Naval Research LaboratoryWashingtonU.S.A.
  3. 3.Department of Pure and Applied PhysicsThe Queen's University of BelfastBelfastIreland

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