%0 Journal Article
%T The effect of limited spatial resolution of stellar surface magnetic field maps on MHD wind and coronal X-ray emission models
%A C. Garraffo
%A O. Cohen
%A J. J. Drake
%A C. Downs
%J Physics
%D 2012
%I arXiv
%R 10.1088/0004-637X/764/1/32
%X We study the influence of the spatial resolution on scales of $5\deg$ and smaller of solar surface magnetic field maps on global magnetohydrodynamic solar wind models, and on a model of coronal heating and X-ray emission. We compare the solutions driven by a low-resolution Wilcox Solar Observatory magnetic map, the same map with spatial resolution artificially increased by a refinement algorithm, and a high-resolution Solar and Heliospheric Observatory Michelson Doppler Imager map. We find that both the wind structure and the X-ray morphology are affected by the fine-scale surface magnetic structure. Moreover, the X-ray morphology is dominated by the closed loop structure between mixed polarities on smaller scales and shows significant changes between high and low resolution maps. We conclude that three-dimensional modeling of coronal X-ray emission has greater surface magnetic field spatial resolution requirements than wind modeling, and can be unreliable unless the dominant mixed polarity magnetic flux is properly resolved.
%U http://arxiv.org/abs/1212.2226v1