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Tests and applications of nonlinear force-free field extrapolations in spherical geometry

Published online by Cambridge University Press:  18 July 2013

Y. Guo  and
M. D. Ding
Y. Guo
Affiliation:
School of Astronomy and Space Science, Nanjing University, Nanjing 210093, China email: guoyang@nju.edu.cn Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210093, China
M. D. Ding
Affiliation:
School of Astronomy and Space Science, Nanjing University, Nanjing 210093, China email: guoyang@nju.edu.cn Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210093, China
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Abstract

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We test a nonlinear force-free field (NLFFF) optimization code in spherical geometry with an analytical solution from Low and Lou. The potential field source surface (PFSS) model is served as the initial and boundary conditions where observed data are not available. The analytical solution can be well recovered if the boundary and initial conditions are properly handled. Next, we discuss the preprocessing procedure for the noisy bottom boundary data, and find that preprocessing is necessary for NLFFF extrapolations when we use the observed photospheric magnetic field as bottom boundaries. Finally, we apply the NLFFF model to a solar area where four active regions interacting with each other. An M8.7 flare occurred in one active region. NLFFF modeling in spherical geometry simultaneously constructs the small and large scale magnetic field configurations better than the PFSS model does.

Keywords

Sun: activitySun: coronaSun: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S294: Solar and Astrophysical Dynamos and Magnetic Activity , August 2012 , pp. 553 - 554
Copyright
Copyright © International Astronomical Union 2013 

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