The chromosphere above sunspot umbrae. IV. Frequency analysis of umbral oscillations.

Details The chromosphere above sunspot umbrae. IV. Frequency analysis of umbral oscillations. The chromosphere above sunspot umbrae. IV. Frequency analysis of umbral oscillations.

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...123..263v&link_type=abstract

Astronomy and Astrophysics, Vol. 123, No. 2, p. 263 - 270

Astronomy and Astrophysics

Astrophysics

6

Oscillations:Solar Chromosphere, Solar Chromosphere:Oscillations, Sunspots:Umbrae

Scientific paper

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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