Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...434..370f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 434, no. 1, p. 370-377
Astronomy and Astrophysics
Astrophysics
50
Chromosphere, Plasma Temperature, Solar Corona, Solar Transition Region, Space Plasmas, Thermal Conductivity, Solar Temperature, Solar Wind, Stellar Models
Scientific paper
When accounting for coronal heat losses (based on previous models) three mechanisms are considered: (1) radiation by coronal plasma; (2) thermal conductivity between the 106 K corona and the 104 K chromosphere and (3) mass motions, mostly into the solar wind. According to these models, thermal conductivity is the most efficient among the coronal heat loss mechanisms. In this paper, we describe studies of the relationships between structures having temperatures of Te greater than or = 1 x 106 and those with temperatures of Te less than 7 x 105 K. We show that effects of thermal conduction between the hot and cold regions are not seen at the expected levels, implying that unimpaired continuity is not being maintained between the 106 and 104 K plasma regions. As a consequence of these findings, we stress that no conclusion on the properties of Te greater than or = 1 x 106 K plasmas can be drawn from properties of the so-called transition region (3 x 104 less than or = Te less than or = 7 x 105 K) plasmas.
Feldman Uri
Laming Martin J.
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