September EIS Nugget

9 September 2011

NLFFF extrapolation of an emerging active region

(by G. Valori, LESIA-Observatoire de Paris)

EIS Nugget September

Nonlinear force-free field (NLFFF) extrapolation was used to investigate the structure of the field at the time of the main emergence. Here, the extrapolation is based on an SOT/SP vector magnetogram obtained from the scan on 4 July 11:58-12:34 UT. 

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