A comparison between the helium 10830 Å and the hydrogen Hα chromospheres |
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| Authors: | R G Giovanelli D N B Hall J W Harvey |
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| Institution: | (1) CSIRO Division of Physics, National Standards Laboratory, Sydney, Australia;(2) Kitt Peak National Observatory, Tucson, Arizona, U.S.A.;(3) Kitt Peak National Observatory, Tucson, Arizona, U.S.A. |
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| Abstract: | Spectroheliograms of resolution about 2 arc sec obtained simultaneously in He 10830 Å and H show in the network a very close agreement in position of dark H mottles and of bright H plage remnants with 10830 Å absorption, though there is not a one-to-one relation between the intensities; the typical intensity in 10830 Å, corrected for overlapping lines, is I 0.91 of the continuum. Some parts of the network do not appear in 10830 Å. This line is much weaker over supergranule centres (I 0.98), though near active regions dark H fibrils coincide with faint 10830 Å fibrils (I0.93–0.98).Operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation. |
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