On the time behaviour of oscillations in sunspot umbrae

Details On the time behaviour of oscillations in sunspot umbrae On the time behaviour of oscillations in sunspot umbrae

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....49..463s&link_type=abstract

Astronomy and Astrophysics, vol. 49, no. 3, June 1976, p. 463-465.

Astronomy and Astrophysics

Astrophysics

18

Photosphere, Power Spectra, Sunspots, Time Dependence, Umbras, Doppler Effect, Frequency Shift, Oscillating Flow, Velocity Measurement, Vibration Mode

Scientific paper

The time behavior of oscillations in a sunspot umbra is studied using
Doppler-compensator velocity records with high time resolution. A
power-spectrum analysis yields modes with different periods. It is found
that during time periods when the spot umbra oscillated with the 180-s
period, the 300-s period was strongly suppressed and vice versa.

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