Dual Flows with Supersonic Velocities in the Sunspot Transition Region

TitleDual Flows with Supersonic Velocities in the Sunspot Transition Region
Publication TypeJournal Article
Year of Publication2004
AuthorsBrynildsen, N., Maltby P., Kjeldseth-Moe O., and Wilhelm K.
JournalAstrophysical Journal
Volume612
Pagination1193-1195
Date PublishedSep
Abstract

Observations of sunspot transition region lines that deviate significantly from a Gaussian shape are presented. Attention is given to ``dual flows,'' a line profile phenomenon in which two distinct velocities are observed within the same spatial resolution element. In 5 out of 12 sunspots we observe dual flows. Several emission line profiles are well represented by two Gaussian line components, one with a subsonic and one with a supersonic line-of-sight velocity.

DOI10.1086/422838