Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp53a..06d&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SP53A-06
Physics
7507 Chromosphere, 7509 Corona, 7529 Photosphere
Scientific paper
We use the Broadband Filter Imager (BFI) and Narrowband Filter Imager (NFI) of the Solar Optical Telescope on Hinode to study the thermal evolution and velocities developed by chromospheric plasma in spicules. We use Dopplergrams made in the Na D 589.6 nm, Hα 656.3 nm and Mg B 517.3 nm passbands, as well as filtergrams in the Ca H 396.8 nm passband to study the spatio-temporal relationship between the various spicular features. We compare those findings with synthesized images based on line profiles computed from high-resolution 3D MHD numerical simulations from the University of Oslo. We also use the Dopplergram data to investigate the velocities that develop in the two types of spicules that were reported previously. We perform statistical analysis of apparent velocities in the plane of the sky and line-of-sight velocities derived from Dopplergrams to disentangle the superposition of Alfvenic wave amplitudes and field-aligned flows. We study these properties for a variety of magnetic field configurations (coronal holes, quiet Sun, active region). Finally, we focus on the formation mechanism of spicules by analyzing spicular features in Dopplergrams on the disk that were taken simultaneously with SP magnetograms. This work was supported by NASA contract NNM07AA01C. The Hinode mission is operated by ISAS/JAXA, NAOJ, NASA, STFC, ESA and NSC.
Carlsson M. P.
de Pontieu Bart
Hansteen Viggo H.
McIntosh Scott W.
Tarbell Theodor
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