Plumes and oscillations in the sunspot transition region

TitlePlumes and oscillations in the sunspot transition region
Publication TypeJournal Article
Year of Publication2001
AuthorsMaltby, P., Brynildsen N., Kjeldseth-Moe O., and Wilhelm K.
JournalAstronomy and Astrophysics
Date PublishedJul

The suggestion that sunspot transition region oscillations are a typical feature of the sunspot plumes is examined. The present observations show 3 min oscillations in the umbra that end at the umbral rim. We find that sunspot plumes located above the umbra show these oscillations, in contrast to plumes above the penumbra. These two findings suggest that the oscillations may be a property of the umbral transition region.