Hinode/SOT Observations Of Apparent "Thermal Plume" Motions In A Solar Prominence

Details Hinode/SOT Observations Of Apparent "Thermal Plume" Motions In A Solar Prominence Hinode/SOT Observations Of Apparent "Thermal Plume" Motions In A Solar Prominence

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9433b&link_type=abstract

American Astronomical Society Meeting 210, #94.33; Bulletin of the American Astronomical Society, Vol. 39, p.222

Astronomy and Astrophysics

Astronomy

Scientific paper

We present 396.8 nm Ca II H-line observations of a large hedgerow, or "sheet", prominence seen on the solar western limb on 30-November-2006. The 16 second cadence observations show dark channels rising vertically at speeds of approximately 10 km/sec to heights of about 15 Mm above the limb. Many of the motions end in vortical overturning near the top of the sheet . Bright downflows of similar speed are also seen within the sheet, often in association with a dark channel that has risen to the top of the sheet. The dark channels are suggestive of hot material rising in thermal plumes within the prominence sheet. Similarly, the bright material motions appear to be density enhanced regions of turbulent downflow. Current models of sheet prominences do not include the observed dynamics. In these models, the prominence plasma is in a low-beta state and is constrained to move only along magnetic field lines. However the motions observed here are extremely complex, implying either that the magnetic field lines are undergoing turbulent motion, thus tangling and reconnecting constantly, or that the plasma is not constrained by the field and is in a high-beta convective state. We measure the motion of several representative "plumes" and downflows, estimate the density and temperature of the prominence plasma, and suggest several avenues for further investigation.
This work was supported by NASA under the Hinode/SOT contract NNM07AA01C.

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