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High-resolution photography of the solar chromosphere

XII: An attempt to measure vertical velocities of Hα bright mottles beyond the limb

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Abstract

Measurements have been made of the heights of seven bright mottles photographed beyond the limb on sequences of broad-band Hα filtergrams. They reveal no evidence of a systematic upward or downward motion persisting throughout the lifetime of a mottle, and in no case does the observed change in height exceed 1″ (725 km) over the period of observation. On the other hand, the possibility cannot be excluded that the bright mottles execute vertical oscillations with velocities comparable to those recently deduced from Hα contrast profile analyses by Grossmann-Doerth and von Uexküll (1971) and Bray (1973) provided the periods do not exceed a few tens of seconds.

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References

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Authors and Affiliations

  1. CSIRO Division of Physics, National Standards Laboratory, 2008, Sydney, Australia

    R. E. Loughhead

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  1. R. E. Loughhead
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Loughhead, R.E. High-resolution photography of the solar chromosphere. Sol Phys 35, 55–61 (1974). https://doi.org/10.1007/BF00156957

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  • DOI: https://doi.org/10.1007/BF00156957

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