Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh51c..06a&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH51C-06
Physics
7823 Ionization Processes (2423), 7827 Kinetic And Mhd Theory, 7835 Magnetic Reconnection (2723, 7526), 7836 Mhd Waves And Instabilities (2149, 2752, 6050), 7837 Neutral Particles (2151)
Scientific paper
The photosphere and chromosphere are sufficiently cold that there is a significant fraction of neutral hydrogen in these layers. Collisions with these neutrals change the nature of the plasma resistivity in such a way that cross-field currents experience a resistivity which may be many orders of magnitude larger than the classical Spitzer resistivity of a fully ionized plasma. This partially ionized layer can therefore act to damp MHD waves and dissipate cross field currents in emerging magnetic flux. We show that the neutral mediated resistivity can damp MHD waves so that Alfvén waves with frequencies above ~eq 0.5 Hz cannot travel from the photosphere into the corona. For flux emergence it is shown that the removal of cross field current changes the amount of material uplift associated and the rising flux thereby preventing its early fragmentation. The effect of neutrals on chromospheric reconnection will also be discussed. Based on these results we argue that the effects of neutral hydrogen on the energy equation and plasma resistivity ought to be essential ingredients in all simulations which aim to couple the photosphere to the overlying corona.
Arber Tony
Haynes Martha
Khodachenko Maxim
Leake Jason
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