On the shape of active region coronal loops observed by Hinode/EIS.

Details On the shape of active region coronal loops observed by Hinode/EIS. On the shape of active region coronal loops observed by Hinode/EIS.

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012hell.confq..14s&link_type=abstract

10th Hellenic Astronomical Conference, Proceedings of the conference held at Ioannina, Greece, 5-8 September 2011. Edited by Io

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We study plasma flows in NOAA Active Region (AR) 10926, observed on December 3, 2006 with Hinode's EUV Imaging Spectrograph (EIS). We measured the line-of-sight velocity along coronal loops in the Fe VIII 185A, Fe X 184A , Fe XII 195A, Fe XIII 202A, and Fe XV 284A spectral lines and reconstructed the three dimensional (3D) shape and velocity of plasma flow using a simple geometrical model. In most cases the flow is unidirectional from one footpoint to the other, resembling siphon flow. However there are also cases of draining motions from the top of the loops to their footpoints. The multi-wavelength observations of the AR indicate that similar loops may show different flow patterns if observed in different spectral lines. We have also carried out magnetic field extrapolations using an SOHO/MDI and an SOT/Spectropolarimeter (SP) magnetogram, in order to identify magnetic field lines corresponding to the reconstructed 3D loops.

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