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| Paper: |
Quiescent Prominence Dynamics: An Update on Hinode/SOT Discoveries |
| Volume: |
454, The 3rd Hinode Science Meeting |
| Page: |
79 |
| Authors: |
Berger, T. |
| Abstract: |
Hinode/SOT has revealed two new flow systems in quiescent prominences: large-scale (order 10 Mm) “bubbles” or “arches” that “inflate” below prominences to create dark cavities in the prominence, and small-scale (order 1 Mm) dark plumes that rise with constant velocity to heights of 10–20 Mm above their origin at the base of prominences. Both flow systems are highly dynamic with ascent speeds ranging from 1–30 km s-1 and evidence in the small-scale plumes of Kelvin-Helmholtz instabilities and turbulent mixing. Neither flow system has been observed in active region prominences. Multi-instrument analysis of one typical cavity shows the column density to be at least a factor of 5 less than the overlying prominence plasma. We discuss the developing understanding of these flow systems in the context of a single formation mechanism: buoyancy instabilities in an emerging flux rope that interacts with the overlying prominence. Measurements of plume and bubble sizes and occurrence frequencies, combined with the column density finding, implies that these flows are a significant source of mass and magnetic flux for quiescent prominences and coronal cavities, respectively. |
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