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arXiv 1402.7016astro-ph.SR
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环日珥系统线偏振的日震和磁成像观测

Helioseismic and Magnetic Imager observations of linear polarization from a loop prominence system

Pascal Saint-Hilaire, Jesper Schou, Juan-Carlos Martínez Oliveros, Hugh S. Hudson, Säm Krucker, Hazel Bain, Sébastien Couvidat

摘要:

太阳动力学天文台的日震和磁成像仪对2013年5月13日在太阳东翼附近发生的X级耀斑之后发生的环日珥系统进行的白光观测显示出线性偏振分量,在$\sim$ 33毫米的高度达到$\sim$ 20%,如果发射仅仅是由于日冕物质对光球光的汤姆逊散射,那么这大约是预期的最大量。与极化分量相关的质量为8.2 $\times$ × 10 $^{14}$ g。在15 Mm高度,环的最亮部分是3(+/-0.5)%的线偏振,仅为纯汤姆逊散射预期的20%,表明在Fe I(617.33 nm)附近波长处存在额外的非偏振分量,可能是热发射。我们估计白光环系统的自由电子密度可能高达1.8 $\times$ 10 $^{12}$ cm $^{-3}$。

英文摘要:

White-light observations by the Solar Dynamics Observatory's Helioseismic and Magnetic Imager of a loop-prominence system occurring in the aftermath of an X-class flare on 2013 May 13 near the eastern solar limb show a linearly polarized component, reaching up to $\sim$20% at an altitude of $\sim$33 Mm, about the maximal amount expected if the emission were due solely to Thomson scattering of photospheric light by the coronal material. The mass associated with the polarized component was 8.2$\times$10$^{14}$ g. At 15 Mm altitude, the brightest part of the loop was 3(+/-0.5)% linearly polarized, only about 20% of that expected from pure Thomson scattering, indicating the presence of an additional unpolarized component at wavelengths near Fe I (617.33 nm), probably thermal emission. We estimated the free electron density of the white-light loop system to possibly be as high as 1.8$\times$10$^{12}$ cm$^{-3}$.

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