Sunspot transition region oscillations

Details Sunspot transition region oscillations Sunspot transition region oscillations

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464..235r&link_type=abstract

In: Proceedings of the SOHO 10/GONG 2000 Workshop: Helio- and asteroseismology at the dawn of the millennium, 2-6 October 2000,

Physics

Sun, Solar Oscillations, Uv Spectra

Scientific paper

Intensity and velocity oscillations have been observed over a period of 4.3 hours in lines of Ne VIII and C IV with the SUMER spectrograph aboard SOHO. These lines are formed in the EUV plume above a sunspot. Applying a wavelet analysis, we find oscillations mainly close to 3 mHz. The temporal behaviour is strongly intermittent, particularly for the velocity oscillations. This non-stationary behaviour may be related with occurrence of blinkers in the umbral transition region.

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