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Title:
The chromosphere above sunspot umbrae. IV. Frequency analysis of umbral oscillations.
Authors:
von Uexküll, M.; Kneer, F.; Mattig, W.
Publication:
Astronomy and Astrophysics, Vol. 123, No. 2, p. 263 - 270 (A&A Homepage)
Publication Date:
07/1983
Origin:
ARI
ARI Keywords:
Oscillations:Solar Chromosphere, Solar Chromosphere:Oscillations, Sunspots:Umbrae
Bibliographic Code:
1983A&A...123..263V

Abstract

The authors analyse time sequences of photographic spectrograms in Ca II H, K, 8498 Å, and 8542 Å, in Sodium D1 and D2, in Ni I 5893 Å and Hα, obtained from two sunspots. The frequency analysis of line intensities and shifts for the umbral chromospheric oscillations in the period range 110 s-200 s is discussed.

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Database: Astronomy
Physics
arXiv e-prints