Large-Scale Flows in Prominence Cavities
Brooks, D. H.; Reeves, K. K.; Gibson, S. E.; Williams, D. R.; Sterling, Alphonse C.; Schmit, D. J.; Tripathi, D.; Tomczyk, S.
United States, South Africa, Japan, United Kingdom
Abstract
Regions of rarefied density often form cavities above quiescent prominences. We observed two different cavities with the Coronal Multichannel Polarimeter on 2005 April 21 and with Hinode/EIS on 2008 November 8. Inside both of these cavities, we find coherent velocity structures based on spectral Doppler shifts. These flows have speeds of 5-10 km s-1, occur over length scales of tens of megameters, and persist for at least 1 hr. Flows in cavities are an example of the nonstatic nature of quiescent structures in the solar atmosphere.