High-Chromosphere and Low-Transition-Region Network: a Different Organization in an Equatorial Coronal Hole?

Details High-Chromosphere and Low-Transition-Region Network: a Different Organization in an Equatorial Coronal Hole? High-Chromosphere and Low-Transition-Region Network: a Different Organization in an Equatorial Coronal Hole?

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996soph..168...37b&link_type=abstract

Solar Physics, Volume 168, Issue 1, pp.37-45

Physics

12

Scientific paper

In order to investigate the high chromosphere and the low transition region in a coronal hole, we have analysed Ca ii, Mg ii and hydrogen resonance lines, recorded by the OSO-8 spectrometer in 1975. We present the comparison between average profiles observed in and out of the equatorial coronal hole which was at the center of the solar disk between 27 and 29 November, 1975. We separate internetwork and quiet-Sun (network+internetwork) profiles: for the internetwork, we observe that the hydrogen and Mg ii profiles recorded in the hole are stronger than the profiles recorded out of the hole; a similar result, but with a much lower contrast, is found for the quiet Sun. We discuss this surprising result.

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