Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...695l.194q&link_type=abstract
The Astrophysical Journal Letters, Volume 695, Issue 2, pp. L194-L197 (2009).
Astronomy and Astrophysics
Astronomy
2
Polarization, Sun: Chromosphere, Sun: Corona
Scientific paper
We measured linear polarization signals of the flash spectrum ranging from 502.5 nm to 528.5 nm after second contact of a total solar eclipse which occurred on 2008 August 1 in China. A large group of spectral lines (especially those lines produced by neutral iron, neutral copper, and as carbon molecules) are found with very high polarization degrees relative to the continuum polarization, and the linear polarization spectrum is more abundantly structured than the flash spectrum itself. According to the observational result, we conclude that coherent scattering and scattering geometry as well as other mechanisms may together play a very important role in producing the high polarization amplitudes. This will help us deepen our understanding of the physical conditions of the solar upper atmospheres and the physical processes occurring there.
Dun G. T.
Liang Hong-Fei
Qu Zhong-Quan
Xu Cheng-Lin
Xue Z. K.
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