Coronal Oscillations above Sunspots?

Details Coronal Oscillations above Sunspots? Coronal Oscillations above Sunspots?

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003soph..218...79d&link_type=abstract

Solar Physics, v. 218, Issue 1, p. 79-84 (2003).

Physics

14

Scientific paper

Observational data clearly indicate the presence of 3-min oscillations in sunspots in spectral lines covering a vast temperature range from the low chromosphere to those lines normally associated with coronal temperatures. We show that after folding in the sunspot plume emission measure distribution, the contribution functions for lines normally formed just below 1×106 K are shifted to lower temperatures. For example, the Feix 171 Å line is shifted to 6×105 K for a Maxwellian distribution and to less than 5×105 K with a non-Maxwellian distribution. Other lines such as Mgix 368 Å will also be affected. This then questions some previous work regarding the suggested detection of 3-min oscillations in the corona above sunspots.

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