Lower solar chromosphere-corona transition region. I - Theoretical models with small temperature gradients

Details Lower solar chromosphere-corona transition region. I - Theoretical models with small temperature gradients Lower solar chromosphere-corona transition region. I - Theoretical models with small temperature gradients

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...355..295w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 355, May 20, 1990, p. 295-308.

Astronomy and Astrophysics

Astrophysics

14

Chromosphere, Solar Atmosphere, Solar Corona, Stellar Models, Temperature Gradients, Lyman Alpha Radiation, Radiative Heat Transfer, Temperature Distribution

Scientific paper

A study of transition region models including the effects of classical thermal conduction, heating, and radiative cooling is carried out with attention directed toward the problem of understanding the observed emission in the lower transition region. It is found that the observationally inferred emission measure curve implies a near-balance between heating and radiative cooling in the lower transition region, and that the presence of strong hydrogen Ly-alpha cooling leads to the existence of singularities in the solutions of the force balance and energy balance equations when such a near-balance between heating and cooling is assumed. These singularities place strong constraints on the nature of viable models of the lower transition region and must be considered when Ly-alpha cooling is important. Previously suggested explanations of the observed emission from the lower transition region are considered in the context of the results of the present study, and conditions for the applicability of these suggested explanations are discussed.

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