Time-varying sources derived from EUV spectroheliograms of the quiet sun

Details Time-varying sources derived from EUV spectroheliograms of the quiet sun Time-varying sources derived from EUV spectroheliograms of the quiet sun

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..105..339n&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 105, June 1986, p. 339-354.

Physics

3

Extreme Ultraviolet Radiation, Solar Activity, Spectroheliographs, Temporal Distribution, Astronomical Maps, Centimeter Waves, Chromosphere, Solar Corona, Temperature Distribution

Scientific paper

EUV spectroheliograms obtained with Skylab instrumentation are used to examine the chromosphere-corona transition region. The spectroheliograms were collected at C II, L-alpha, O VI, C III, Lyc, Mg X and O IV wavelengths simultaneously. Account was taken of Lyman continuum absorption at each pixel by measuring the optical thickness of the weakening in terms of the intensity of the O IV line. Detailed discussions are presented of events with an N-source, a few R-sources and intense weakening, and comparisons are made with the structures observed in the quiet sun. The transition region is found to be associated with the thermal evolution of the chromospheric structure. The region is directly heated, producing an N-source at the chromosphere-corona interface.

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