Computer Science – Sound
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0307f&link_type=abstract
American Astronomical Society, SPD meeting #42, #3.07; Bulletin of the American Astronomical Society, Vol. 43, 2011
Computer Science
Sound
Scientific paper
Explosive events have been observed for years in many transition region lines across temperatures from 20,000 - 250,000 K. They are particularly well-known in lines of C IV (the 1550A doublet) and Si IV (1393A) at temperatures of 100,000 K. They are characterized by large non-thermal doppler broadening of the order of 100 km/s, are usually small 2000 km, and short-lived, 60 - 90 sec. Event rates have been measured on the order of 600 events per second over the visible surface of the Sun. In Fox, Kankelborg, and Thomas (2010) we showed the discovery of the first explosive event reported in the literature in the He II 304A line, at a temperature of 80,000 K (Andretta et. al., 2000), using data from the Multi-Order Solar EUV Spectrograph sounding rocket instrument. Explosive events in He II lines are seldom reported in the literature, and no event rates are given. We present here the first estimate of He II explosive event rates and compare to event rates for explosive events in other ions. This work supported by the NASA LCAS program, grant NAG5-10997 and NNX-07AG6G.
Fox Lewis
Kankelborg Charles C.
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