X-ray Plasma Ejection Associated with Hα Filament Eruption

Details X-ray Plasma Ejection Associated with Hα Filament Eruption X-ray Plasma Ejection Associated with Hα Filament Eruption

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spro.proc..367o&link_type=abstract

Solar Physics with Radio Observations, Proceedings of the Nobeyama Symposium, held in Kiyosato, Japan, Oct. 27-30, 1998, Edited

Physics

Scientific paper

The 1993 May 14 flare was associated with both an X-ray plasma ejection and an eruption of an active region filament. The flare proceeded through two stages. In the first stage the X-ray plasma ejection, Hα filament eruption, and a chain of point-like Hα brightenings occurred. In the second stage, an Hα two-ribbon flare and X-ray arcade structure were seen in Hα and soft X-ray images, respectively. The X-ray plasma ejection and the eruptive Hα filament in the first stage started to rise before the main peak of the hard X-ray emission. The ejected X-ray plasma was a loop-like feature that started to rise with a speed of ~270 km s-1 from below and temporally after the Hα filament eruption. The ejected X-ray loop appeared to be decelerated when it approached the Hα filament, and then rose with the eruptive filament at an apparent velocity of ~ 100 km s-1. The temperature of the ejected loop was 9.5±2.3 MK. The mass of the ejected X-ray loop and of the pre-eruption Hα filament were estimated to be ~ 1014 g and <= 1015 g, respectively. Even if all the material of the pre-eruption filament was ejected, the total kinetic energy (<= 1.5 × 1029 erg) of both the ejected X-ray loop and the eruptive Hα filament was smaller than the thermal energy content of the flare loops (~ 1.3 × 1030 erg). This result implies that the energy involved in the ejected material was not the energy source of the flare, although they were closely related each other. The rising motion of the ejected X-ray loop was, presumably, one of the causes triggering the flare.

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