Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640303s&link_type=abstract
American Astronomical Society, AAS Meeting #216, #403.03; Bulletin of the American Astronomical Society, Vol. 41, p.878
Astronomy and Astrophysics
Astronomy
Scientific paper
We examine solar polar region spicules using high-cadence Ca II data from the Solar Optical Telescope (SOT) on the Hinode spacecraft. We sharpened the images by convolving them with the inverse-point-spread function of the SOT Ca II filter, and we are able to see some of the spicules originating on the disk just inside the limb. Bright points are frequently at the root of the disk spicules. These ``Ca II brightenings'' scuttle around at few x 10 km/s, live for 100 sec, and may be what are variously known as ``H2V grains,'' ``K2V grains,'' or "K2V bright points.'' When viewed extending over the limb, some of the spicules appear to expand horizontally or spit into two or more components, with the horizontal expansion or splitting velocities reaching 50 km/s. This work was funded by NASA's Science Mission Directorate through the Living With a Star Targeted Research and Technology Program, the Supporting Research and Program, the Heliospheric Guest Investigator Program, and the Hinode project.
DeForest Craig Edward
Moore Robert L.
Sterling Alphonse C.
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