What do Spicules Tell us About the Chromosphere?

Details What do Spicules Tell us About the Chromosphere? What do Spicules Tell us About the Chromosphere?

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.2.15d&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

In the past few years, high-resolution observations with ground-based telescopes and the Broadband Filter Imager (BFI) and Narrowband Filter Imager (NFI) of the Solar Optical Telescope onboard Hinode have revolutionized our view of spicules and their role in the chromosphere. We review some of these results, including the discovery of two different types of spicules with different dynamics and formation mechanisms, as well as the finding that the chromosphere is riddled with strong Alfvenic waves.
In an effort to determine the formation mechanism of spicules and their impact on the outer atmosphere, we further focus on the thermal evolution and velocities developed by spicules. We use Dopplergrams made in the Na D 589.6 nm, H-alpha 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.

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