The effect of limited spatial resolution of stellar surface magnetic field maps on MHD wind and coronal X-ray emission models

Дата и время публикации : 2012-12-10T21:37:25Z

Авторы публикации и институты :
C. Garraffo
O. Cohen
J. J. Drake
C. Downs

Ссылка на журнал-издание: The Astrophysical Journal 2013 764 32
Коментарии к cтатье: 26 pages, 6 figures, accepted for publication in ApJ
Первичная категория: astro-ph.SR

Все категории : astro-ph.SR

Краткий обзор статьи: We study the influence of the spatial resolution on scales of $5deg$ 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.

Category: Physics