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Article overview
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Extremely Large EUV Late Phase of Solar Flares | Kai Liu
; Yuming Wang
; Jie Zhang
; Xin Cheng
; Rui Liu
; Chenglong Shen
; | Date: |
21 Apr 2015 | Abstract: | The second peak in the Fe XVI 33.5 nm line irradiance observed during solar
flares by Extreme ultraviolet Variability Experiment (EVE) is known as Extreme
UltraViolet (EUV) late phase. Our previous paper (Liu et al. 2013) found that
the main emissions in the late phase are originated from large-scale loop
arcades that are closely connected to but different from the post flare loops
(PFLs), and we also proposed that a long cooling process without additional
heating could explain the late phase. In this paper, we define the extremely
large late phase because it not only has a bigger peak in the warm 33.5
irradiance profile, but also releases more EUV radiative energy than the main
phase. Through detailedly inspecting the EUV images from three point-of-view,
it is found that, besides the later phase loop arcades, the more contribution
of the extremely large late phase is from a hot structure that fails to erupt.
This hot structure is identified as a flux rope, which is quickly energized by
the flare reconnection and later on continuously produces the thermal energy
during the gradual phase. Together with the late-phase loop arcades, the fail
to erupt flux rope with the additional heating create the extremely large EUV
late phase. | Source: | arXiv, 1504.5340 | Services: | Forum | Review | PDF | Favorites |
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