Other
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..437m&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Other
6
Scientific paper
To explain the heating of stellar chromospheres and transition regions two classes of heating mechanisms have been considered: (1) dissipation of acoustic and magnetic waves generated in stellar convection zones; and (2) dissipation of currents generated by photospheric motions of surface magnetic fields. I will review both classes of heating mechanisms and discuss recent results which demonstrate that theoretical models of stellar chromospheres based on the wave heating (1) can explain the ""basal flux"" and the observed Ca II emission in most stars but cannot account for the observed Mg II emission in active stars. I will also present theoretical arguments which imply that the base of stellar chromospheres is heated by acoustic waves the heating of the middle and upper chromospheric layers is dominated by magnetic waves associated with magnetic flux tubes and that other non-wave (2)heating mechanisms are required to explain the structure of the highest layers of stellar chromospheres and transition regions.
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