Shock Waves As a Driver of Surges
Abstract
We found that a surge consists of multiple shock features for a interval of 110 s with our high spatio-temporal spectroscopic observation using the Fast Imaging Solar Spectrograph (FISS). Each shock is identified with the sudden appearance of an absorption feature at the blue wing of the Ca ii line and Halpha line, indicating the upward motion of 20-40 km s (-1) . Then the absorption feature gradually shifts to the red wing with a constant acceleration, reaching the downward motion of 20-40 km s (-1) within about 6 minutes. We also found magnetic flux cancellation and an Ellerman bomb near the foot point of the surge, suggesting that magnetic reconnection occurred in the low atmosphere. Our results suggest that the waves produced by energy release due to the magnetic reconnection in the low atmosphere propagates upward in the form of the shock waves, which drive the surge.
- Publication:
-
40th COSPAR Scientific Assembly
- Pub Date:
- 2014
- Bibcode:
- 2014cosp...40E3698Y