Bibcode
Wiegelmann, Thomas; Yelles, Lotfi; Solanki, Sami; Lagg, Andreas
Referencia bibliográfica
38th COSPAR Scientific Assembly. Held 18-15 July 2010, in Bremen, Germany, p.5
Advertised on:
0
2010
Número de citas
0
Número de citas referidas
0
Descripción
Solar magnetic fields are usually extrapolated into the corona starting
from photospheric mag-netic measurements that can suffer from
significant uncertainties caused by the presence of unresolved fine
structures due to a limited spatial resolution and by the limited
polarimet-ric accuracy and spectral resolution. We investigate how these
inaccuracies in the measured photospheric magnetic field vector
influence the accuracy of the extrapolated coronal mag-netic field. We
compare non-linear force-free coronal magnetic field extrapolations from
a 3-D radiation MHD simulation snapshot with corresponding
extrapolations from synthetic vector magnetograms. The synthetic
magnetograms contain instrumental effects such as noise, limited spatial
and spectral resolution and the effect of employing a filter instrument.
The parameters are chosen in particular to mimic the effects of the
Hinode/SOT and the future Solar Orbiter PHI instruments, respectively.
We discuss, how photospheric structures, which are inherent in the MHD
snapshot, but not resolved in the photospheric magnetic field
measurements, influence the quality of the computed coronal magnetic
field model.