ABSTRACT
HEESU YANGhsyang@kasi.re.kr
Korea Astronomy and Space Science Institute
| Title : | Observation of the Kelvin-Helmholtz Instability in the Solar Prominence |
| Abstract | |
| Many solar prominences end their lives through eruptions or abrupt disappearances that are associated with the thermal or dynamical instabilities. Such instabilities are very important at the Sun because they may have a big responsiblility for energy transport and conversion. We present a clear observation of the Kelvin-Helmholtz Instability (KHI) taking place in a solar prominence on the limb observation using the Hα Lyot filter installed at the New Vacuum Solar Telescope, Fuxian Solar Observatory in Yunnan, China. Beside the prominence, plasma floated up from the chromosphere and streamed parallel to the limb. The plasma stream is accelerated to the velocity of about 20 − 60 km s−1 and then undulated. We found that the 2′′ and 5′′-size vortices formed in the stream, and they floated along the stream and then broken up. After breaking of the 5′′-size vortex, plasma appeared to eject from the stream in the AIA images. We attribute the phenomenon to the KHI triggered by the velocity shear between the stream guided by the magnetic field and the surrounding media. The plasma ejection may indicate a considerable transport of the prominence material into the upper layer by magnetic reconnection at the vortices. |
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