Polarization of the charge-exchange X-rays induced in the Heliosphere

Details Polarization of the charge-exchange X-rays induced in the Heliosphere Polarization of the charge-exchange X-rays induced in the Heliosphere

2010-12-06

arxiv.org/abs/1012.1349v2

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

accepted for publication in ApJL

Scientific paper

We report results of a theoretical investigation of polarization of the X-ray emissions induced in charge-exchange collisions of fully stripped solar wind ions C$^{6+}$ and O$^{8+}$ with the heliospheric hydrogen atoms. The polarization of X-ray emissions has been computed for line-of-sight observations within the ecliptic plane as a function of solar wind ion velocities, including a range of velocities corresponding to the slow and fast solar wind, and Coronal Mass Ejections. To determine the variability of polarization of heliospheric X-ray emissions, the polarization has been computed for solar minimum conditions with self-consistent parameters of the solar wind plasma and heliospheric gas and compared with the polarization calculated for an averaged solar activity. We predict the polarization of charge-exchange X-rays to be between 3% and 8%, depending on the line-of-sight geometry, solar wind ion velocity, and the selected emission lines.

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