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Observational Study of a Peculiar Solar Limb Event Occurred on 11 January 2002 View all abstracts by submitter

Hui Li   Submitted: 2009-04-22 18:57

On 11 January 2002, using the Multi-channel Infrared Solar Spectrograph at the Purple Mountain Observatory, we obtained Hα , CaII 8542 and HeI 10830 spectra and slit-jaw Hα images of a peculiar solar limb event. A close resemblance of its intensity to that of a small flare and the GOES X-ray flux indicates that it was an active prominence. However, its morphological evolution and velocity variation were different from general typical active prominences, such as limb flares, post-flare loops, surges and sprays. It started with the ejection of material from the flare site. In the early phase, the ejecta was as bright as a limb flare and kept rising until reaching the height of (8 - 10) imes104 km at an almost constant velocity of 91.7 km s-1 with its lower part always connected to the solar surface. EUV images in 195 Å show similar structure as in the H-apha line, indicating the coexistence of plasmas with temperatures differing more than two orders of magnitude. Later some material started to fall back to another bright area on the solar surface. The falling material did not show the collimated structure of surges or the arc structure of flaring arches. A red-shift velocity of more than 200 km s-1 was detected in a bright point close to the outer edge of the closed loop system formed later, which dispersed in a few minutes and became a part of the newly formed large loop. The ejected material did not leave the sun, indicating that the magnetic reconnection was not sufficient to remove the overlying field lines during the process. The spectral line profiles showed large widths and variable velocities, and therefore the line-pair method is not applicable to this event for the estimation of physical parameters.

Authors: Hui Li and Jianqi You
Projects: None

Publication Status: Solar Physics, in press
Last Modified: 2009-04-23 09:12
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