On the nature of the 3 minute oscillations above sunspots

Details On the nature of the 3 minute oscillations above sunspots On the nature of the 3 minute oscillations above sunspots

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..183h&link_type=abstract

In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun

Computer Science

2

Sunspots, Solar Oscillations, Ultraviolet

Scientific paper

Oscillations in the sunspot transition region and corona are observed simultaneously with the Coronal Diagnostic Spectrometer - CDS on SOHO and the Transition Region And Coronal Explorer - TRACE. Observations of thirteen sunspots in 2001 and 2002 show that the amplitude in the relative integrated line intensity increases with increasing temperature, reaches a maximum for emission lines formed close to 1-2×105K, and decreases at 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 loops. The observed power spectra show one dominating peak close to 6 mHz. To explore the nature of the waves we calculate upwardly propagating acoustic waves confined to a magnetic flux tube and compare the results with the observations.

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