Transition Region Oscillations in Sunspot Plumes

Details Transition Region Oscillations in Sunspot Plumes Transition Region Oscillations in Sunspot Plumes

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..327f&link_type=abstract

8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Sunspot plumes are compact features, located close to sunspots and bright in the transition region lines emitted between 1.7x105 K and 4x105 K. Intensity oscillations of the transition region lines in a sunspot plume in the active region AR8249 were reported by Fludra (1999, Astron. Astrophys., 344, L75), based on the data recorded by the Coronal Diagnostic Spectrometer (CDS). In this paper we examine high-cadence CDS observations of five sunspot plumes, and present the time series of line intensities and their power spectra. We find that the OV 630 A line oscillates in all sunspot plumes with periods between 150 and 200 seconds. The oscillation periods and amplitudes seen at different temperatures are compared.

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