Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..513b&link_type=abstract
In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze
Physics
1
Sunspot, Oscillation, Ultraviolet
Scientific paper
The results of simultaneous observations with CDS on SOHO and TRACE for thirteen sunspots in 2001 and 2002 are combined with previous results for six sunspots observed with CDS and SUMER on SOHO. Intensity oscillations are detected above each umbra and spectral observations of chromospheric and transition region lines allow us to measure oscillations in the line-of-sight velocity in several sunspots. The power spectra show one dominant peak close to 6 mHz, corresponding to a period of 3 minutes. The oscillation amplitude increases with increasing temperature, reaches a maximum for lines emitting close to 1-2×105K, and decreases for higher temperatures. Part of the wave energy penetrates into the corona, channeled into small areas that appear to coincide with the endpoints of sunspot coronal lops. The observations support the hypothesis that the oscillations are caused by upwardly propagating acoustic waves. The observations are not compatible with the concept of a chromospheric resonator.
Brynildsen Nils
Fredvik T.
Kjeldseth-Moe Olav
Maltby Per
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