Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9411s&link_type=abstract
American Astronomical Society Meeting 210, #94.11; Bulletin of the American Astronomical Society, Vol. 39, p.219
Astronomy and Astrophysics
Astronomy
Scientific paper
High cadence observation with a Ca II H broadband filtergraph (passband of 0.25 nm) of the Solar Optical Telescope (SOT) aboard HINODE has revealed dynamical nature of solar limb spicules. Thanks to a diffraction-limited and low-scattered light property of the instrument, we can track the detailed evolution of individual spicules for the first time with a spatial resolution of 0.2 arcsec. The spicules in Ca II H are typically several arcsec tall and have multi-thread structure; each threads are a few tenth of arcsec wide. It should be stressed that most spicules do not show a simple up-and-down motion along a rigid path line. They start with bright structure emanating from Ca II H bright region, get widen and diffused with time and ascent, showing expansion with lateral or even helical motion in tall events. Small and short lived spicules tend to fade out after ascent. We will present new findings of spicule dynamics in different magnetic environments and discuss about long standing controversy of its motion and evolution.
Ichimoto Kiyoshi
Katsukawa Yukio
Nagata Shin'ichi
Okamoto Tohru
Shimizu Toshifumi
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