Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....58..185f&link_type=abstract
Astronomy and Astrophysics, vol. 58, no. 1-2, June 1977, p. 185-188.
Astronomy and Astrophysics
Astrophysics
7
Energy Dissipation, Shock Wave Propagation, Solar Atmosphere, Solar Corona, Ultraviolet Spectra, Equations Of Motion, Far Ultraviolet Radiation
Scientific paper
The paper investigates the importance of shock-wave dissipation terms not included in the momentum-conservation and shock-wave-propagation equations used previously to develop models of the solar corona and transition region that have not been in satisfactory agreement with observations of solar EUV line intensities. Two possible shock-wave cycles are analyzed, and a differential equation is obtained which allows for shock-wave energy dissipation in the propagation equation. A combined equation of mass and momentum conservation is then derived which takes into account the fact that shock-wave energy dissipation gives rise to a pressure gradient in the atmosphere. Several models having initially weak or strong shocks are computed with the dissipation terms neglected or else included in only one of the two relevant equations. The results show that the inclusion of dissipation terms neither improves nor degrades the agreement of the model predictions with observed EUV line intensities.
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