On velocity oscillations in sunspot umbrae

Details On velocity oscillations in sunspot umbrae On velocity oscillations in sunspot umbrae

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....50..367s&link_type=abstract

Astronomy and Astrophysics, vol. 50, no. 3, Aug. 1976, p. 367-370.

Astronomy and Astrophysics

Astrophysics

26

Energy Transfer, Power Spectra, Solar Spectra, Spectrum Analysis, Sunspots, Umbras, Astronomical Models, Doppler Effect, Magnetohydrodynamic Waves, Root-Mean-Square Errors, Titanium Oxides

Scientific paper

We report results from a power spectrum analysis of photographic measurements of velocity oscillations in two sunspot umbrae. We find oscillations with 3 regimes, of periods: 470-300 s, 196-164 s and 123-110 s with a peak to peak amplitude of about 0.6 km/sec. Whereas the two long period oscillations agree well with the findings of previous authors the detection of the short period oscillations is new. We find significant power for the 300 s oscillations in a purely umbral molecular line, 6496.2 A (TiO), which establishes the umbral origin of this oscillation mode.

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