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Equator-pole differences in the solar chromosphere from Lyman-continuum data

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Abstract

From the analysis of OSO-4 Lyman-continuum spectroheliograms, differences in the brightness and the color temperature between the poles and the equator have been found. These differences are interpreted as resulting from a lower chromospheric density at the poles than at the equator. Two models, one for the poles and one for the equator, giving temperature and density as a function of height, explain the observations. The poles have a lower density and a smaller temperature gradient than the equator does. The differences begin in the middle chromosphere and increase toward the transition zone.

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Authors and Affiliations

  1. Harvard College Observatory, Cambridge, Mass., U.S.A.

    J. E. Vernazza

  2. Smithsonian Astrophysical Observatory and Harvard College Observatory, 02138, Cambridge, Mass., U.S.A.

    R. W. Noyes

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  1. J. E. Vernazza
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  2. R. W. Noyes
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Vernazza, J.E., Noyes, R.W. Equator-pole differences in the solar chromosphere from Lyman-continuum data. Sol Phys 26, 335–342 (1972). https://doi.org/10.1007/BF00165274

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  • DOI: https://doi.org/10.1007/BF00165274

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