Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9414m&link_type=abstract
American Astronomical Society Meeting 210, #94.14; Bulletin of the American Astronomical Society, Vol. 39, p.219
Astronomy and Astrophysics
Astronomy
Scientific paper
Hinode/SOT Ca II broadband images and movies show that there are several different types of spicules at the limb. These different types are distinguished by dynamics on different timescales. The first type involves up- and downward motion on timescales of 3-5 minutes. The dynamics of these spicules are very similar to those of fibrils and mottles as observed on the disk. Recent work suggests that these are driven by slow-mode magnetoacoustic shocks that form when convective flows and global oscillations leak into the chromosphere along magnetic flux tubes. The second type is much more dynamic with typical lifetimes of 10-60 s. These spicules are characterized by sudden appearance and disappearance that may be indicative of rapid heating to TR temperatures. We will describe the properties of these spicules in various magnetic environments (coronal hole, quiet Sun, active region) and study the possible role of reconnection in driving the second type of spicules. In addition, we will perform detailed comparisons of these different types of jets with synthetic Ca images derived from advanced 3D numerical simulations that encompass the convection zone up through the corona.
Carlsson Marcus
de Pontieu Bart
Hansteen Viggo H.
McIntosh Scott W.
Schrijver Carolus J.
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