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Solar Phys (2008) 248: 2950 DOI 10.1007/s11207-008-9155-2

Summary: Solar Phys (2008) 248: 29­50
DOI 10.1007/s11207-008-9155-2
Topological Departures from Translational Invariance
along a Filament Observed by THEMIS
J. Dudík · G. Aulanier · B. Schmieder · V. Bommier ·
T. Roudier
Received: 25 July 2007 / Accepted: 21 February 2008 / Published online: 19 March 2008
© Springer Science+Business Media B.V. 2008
Abstract We study the topology of the 3D magnetic field in a filament channel to address
the following questions: Is a filament always formed in a single flux tube? How does the
photospheric magnetic field lead to filament interruptions and to feet formation? What is the
relation between feet-related field lines and the parasitic polarities? What can topological
analyses teach us about EUV filament channels? To do so, we consider a filament observed
on 6 October 2004 with THEMIS/MTR, in H with the full line profile simultaneously
and cospatially with its photospheric vector magnetic field. The coronal magnetic field was
calculated from a "linear magnetohydrostatic" extrapolation of a composite THEMIS-MDI
magnetogram. Its free parameters were adjusted to get the best match possible between
the distribution of modeled plasma-supporting dips and the H filament morphology. The
model results in moderate plasma 1 at low altitudes in the filament, in conjunction with
non-negligible departures from force-freeness measured by various metrics. The filament


Source: Aulanier, Guillaume - Observatoire de Paris


Collections: Physics