Jia-Yan Yang, Yun-Chun Jiang, Dan Yang, Yi Bi, Bo Yang, Rui-Sheng Zheng, Jun-Chao Hong
We report on the rare eruption of a miniature H_alpha filament that took a
surge form. The filament first underwent a full development within 46 minutes
and then began to erupt 9 minutes later, followed by a compact, impulsive X-ray
class M2.2 flare with a two ribbon nature only at the early eruption phase.
During the eruption, its top rose, whereas the two legs remained rooted in the
chromosphere and swelled little perpendicular to the rising direction. This led
to a surge-like eruption with a narrow angular extent. Similar to the recent
observations for standard and blowout X-ray jets by Moore et al., we thus
define it as a "blowout H_alpha surge". Furthermore, our observations showed
that the eruption was associated with (1) a coronal mass ejection guided by a
preexisting streamer, (2) abrupt, significant, and persistent changes in the
photospheric magnetic field around the filament, and (3) sudden disappearance
of a small pore. These observations thus provide evidence that blowout surge is
a small-scale version of large-scale filament eruption in many aspects. Our
observations further suggest that at least part of H_alpha surges belong to
blowout-type ones, and exact distinction between standard and blowout H_alpha
surges is important in understanding their different origins and associated
eruptive phenomena.
View original:
http://arxiv.org/abs/1111.4037
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