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On the Temporal Evolution of the Disc Counterpart of Type II Spicules in Quiet Sun by Sekse, D. H.; van der Voort, L. Rouppe; De Pontieu, B. is a scholarly article available to read on EtoBox.

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The type II spicule has been speculated to provide enough hot plasma to play an important role in the mass loading and heating of the corona. We analyse the disc counterpart to type II spicules, RBEs, in three high quality datasets from CRISP at the SST. In a quiet Sun region at disc centre we find lower Doppler velocities, 15-40km/s, and Doppler widths, 2-15km/s, of RBEs than in earlier coronal hole studies, 30-50km/s and 7-23km/s, respectively. We examine the spatial dependence of Doppler velocities and widths along RBE axes and conclude that there is no clear trend over the FOV or in individual RBEs in quiet Sun at disc centre. These differences with previous coronal hole studies are attributed to the more varying magnetic field configuration in quiet Sun conditions. Using an extremely high cadence dataset allowed us to improve greatly on the determination of lifetimes of RBEs, found to range from 5 to 60s with an average of 30s, as well as the transverse motions in RBEs, with transverse velocities up to 55km/s and averaging 12km/s. Furthermore, our measurements of the recurrence rates of RBEs provide important new constraints on coronal heating by spicules. We also see many exa

Author

Sekse, D. H.; van der Voort, L. Rouppe; De Pontieu, B.

Published

2012

Language

EN