On the structure of the solar transition zone and lower corona

Details On the structure of the solar transition zone and lower corona On the structure of the solar transition zone and lower corona

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..369f&link_type=abstract

Astrophysical Journal, Part 1, vol. 229, Apr. 1, 1979, p. 369-374. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

61

Chromosphere, Solar Atmosphere, Solar Corona, Stellar Structure, Atmospheric Models, Forbidden Transitions, Skylab Program, Solar Spectra, Spicules, Stellar Models

Scientific paper

Recent observations of the solar transition zone and corona obtained primarily from NRL spectrographs on Skylab are summarized and used to examine the structure of the transition zone. The transition zone is revealed to be more inhomogeneous than is apparent from spectroheliograms with spatial resolution of about 3 arcsec. Transition-zone emission appears to arise in spicularlike structures. The effective area covered by the emitting structures at lower transition-zone temperatures (about 100,000 K) is only about 1% of the total surface area of the sun. The transition zone is highly inhomogeneous even over cell interior regions, where fluctuations in brightness by factors of 25 can occur. It is shown that homogeneous coronal models are not valid for the inner corona. Most of the higher-density inner corona is concentrated into looplike structures that extend down to the white-light limb. These structures are unrelated to the spicular-type structures that produce most of the transition-zone emission.

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