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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20130604T123000
DTEND;TZID=Atlantic/Canary:20130604T133000
UID:iactalks-499
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/499
CREATED:2013-06-04T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY: Helium Emissions as a Probe for Plasma Temperatures. 
DESCRIPTION: Helium Emissions as a Probe for Plasma Temperatures. \nProf. E
 berhard Wiehr\n\nThe strongest He II emission in the visible spectral rang
 e, at 4686 A, is for the first time observed at a spectral resolution suff
 iciently high for a line profile analysis in quiescent solar prominences. 
 It is found that the He II line width exceeds by far that of emissions fro
 m neutral helium which, in turn, show significant differences between the 
 triplet and singlet emissions. The width hierarchy from singlet over tripl
 et to He II suggests an origin in increasingly hot plasma of the transitio
 n to hot coronal surroundings. The ratio of integrated line emission is fo
 und to be independent on the prominence size suggesting that each fine-str
 ucture has its own transition to hot coronal gas in between the treads.
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