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Spatial structure in lines in the 3398–3526 å region at the extreme limb: Observation, identification and interpretation

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Abstract

We have obtained spectrograms of high spatial and spectral resolution of the extreme solar limb, using the vacuum tower telescope of Sacramento Peak Observatory. We have identified emission lines in the range 3398–3526 Å, and classified them according to intensity, spatial structure (intensity variation), and profile. Some lines show spatial intensity variation; others do not. We show that this effect is related to the abundance of the element responsible for the line and the mean lower-level excitation potential of interlocked lines. We explain the effect in terms of radiative interlocking with other lines, as well as the characteristic size of the volume contributing to the mean intensity.

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Authors and Affiliations

  1. Department of Physics, C-011, University of California, 92093, San Diego, La Jolla, Calif., U.S.A.

    Richard C. Canfield

  2. Hopkins Observatory, Williams College, 01267, Williamstown, Mass., U.S.A.

    Jay M. Pasachoff

  3. SC-23, NASA/Johnson Space Center, 77058, Houston, Tex., U.S.A.

    Robert E. Stencel

  4. Sacramento Peak Observatory, 88349, Sunspot, NM, U.S.A.

    Jacques M. Beckers

Authors
  1. Richard C. Canfield
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  2. Jay M. Pasachoff
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  3. Robert E. Stencel
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  4. Jacques M. Beckers
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Additional information

Also Five College Astronomy Department, Amherst, Mass. 01003, U.S.A.

Operated by the Association of Universities for Research in Astronomy Inc. under contract with the National Science Foundation.

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Canfield, R.C., Pasachoff, J.M., Stencel, R.E. et al. Spatial structure in lines in the 3398–3526 å region at the extreme limb: Observation, identification and interpretation. Sol Phys 58, 263–277 (1978). https://doi.org/10.1007/BF00157271

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  • DOI: https://doi.org/10.1007/BF00157271

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