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Chromospheric absorbing features promising the appearance and the development of an active center

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Abstract

In this paper we study some absorbing features seldom associated with flare occurrence and observed in the wings of H α by means of a cinematographic patrol.

We describe short lived chromospheric dark features with strong velocity fields and we show their correlation with the birth and the further development of an active center.

It is shown that radial velocities precede the modifications of magnetic fields.

An attempt to compare these chromospheric velocities and photospheric ones points out that it could be possible to find good correlation between them in a changing but not flaring region.

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Authors and Affiliations

  1. Observatoire de Paris, Meudon, France

    M. -J. Martres & I. Soru-Escaut

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  1. M. -J. Martres
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  2. I. Soru-Escaut
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Martres, M.J., Soru-Escaut, I. Chromospheric absorbing features promising the appearance and the development of an active center. Sol Phys 21, 137–145 (1971). https://doi.org/10.1007/BF00155784

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  • DOI: https://doi.org/10.1007/BF00155784

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