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Evolution of the solar Lyman alpha flux during four consecutive years

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Abstract

Four consecutive years of a quasi-continuous survey of the solar Lα line are presented. Absolute calibration and aging correction are evaluated producing higher quality measurements which are:

  • -the total Lα flux,

  • -the central Lα flux,

  • -the blue wing flux at 0.33 Å from the center,

  • -the slope of the blue wing at the same location.

Empirical laws are deduced from this large amount of data giving a relation between these different parameters and the flux integrated over the whole line. Furthermore, other empirical laws are obtained between the total Lα flux and two solar activity indices.

These relations give a possibility of evaluating the solar Lα flux even when no observation is available and, as previously found by Prinz (1974), show that to a first approximation the solar Lα flux is composed of a quiet and of an active component. The active component changes with the 27 days period; the quiet one with the 11 yr solar cycle.

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Authors and Affiliations

  1. Centre National de la Recherche Scientifique, Laboratoire de Physique Stellaire et Planétaire, Verrières-le-Buisson, France

    A. Vidal-Madjar

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  1. A. Vidal-Madjar
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Vidal-Madjar, A. Evolution of the solar Lyman alpha flux during four consecutive years. Sol Phys 40, 69–86 (1975). https://doi.org/10.1007/BF00183153

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  • DOI: https://doi.org/10.1007/BF00183153

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