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Session: Heliophysics and the Solar System

Name: Mr. Georgios Chouliaras (University of St. Andrews)
Coauthors: No coauthors were included.
Type: Oral
Title: Magnetic flux emergence: Effects of partial ionisation
Abstract:

We have performed 3-D numerical simulations to investigate the effect of partial ionization to the process of magnetic flux emergence. In our study, we have modified the single fluid MHD equations to include the presence of neutrals and we have performed two basic experiments: one that assumes a fully ionized plasma (FI case) and one that assumes a partially ionized plasma (PI case). We find that the PI case brings less dense plasma at and above the solar surface. Furthermore, we find that partial ionization alters the emerging magnetic field structure leading to a different shape of the polarities in the emerged bipolar regions compare to the FI case. The amount of emerging flux into the solar atmosphere is larger in the PI case, which has the same initial plasma beta with the FI case, but larger initial magnetic field strength. The expansion of the field above the photosphere occurs relatively earlier in the PI case and we confirm that the inclusion of partial ionization reduces the cooling due to the adiabatic expansion. However, it does not appear to work as a heating mechanism of the atmospheric plasma. The performance of these experiments in three dimensions shows that PI does not prevent the formation of unstable magnetic structures, which erupt into the outer solar atmosphere. Georgios Chouliaras , Dr Vasilis Archontis