Computer Science – Sound
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2507b&link_type=abstract
American Astronomical Society Meeting 210, #25.07; Bulletin of the American Astronomical Society, Vol. 39, p.132
Computer Science
Sound
Scientific paper
The Extreme Ultraviolet Normal Incidence Spectrograph (EUNIS) sounding rocket instrument observed a cool transient brightening in the quiet Sun during its first flight on 2006 April 12. The brightening appeared in emission from He II, formed at temperatures around 50,000 K (log T = 4.7), but was not evident in emission from ions formed at greater temperatures, including Mg VI (log T = 5.6), Mg IX (log T = 6.0), and Fe XIV (log T = 6.3). Of these and other lines in the EUNIS spectra, only lines from He II and Mg IX were strong enough in the quiet Sun to measure relative Doppler velocities during this transient; He II revealed continuous upflows around 15 km/s while Mg IX revealed no significant velocities. The average He II intensity enhancement factor observed with EUNIS was 1.34, and its maximum was 1.84. Coordinated observations with SOHO's EIT reveal a source area of 3.3x10^7 km^2, in which the average He II intensity enhancement factor was 1.39 and its maximum was 1.81; the transient did not appear in EIT's hotter wavebands. Variations in the local magnetic field strength measured with SOHO's MDI were marginal. The EUNIS program is supported by NASA through its Low Cost Access to Space Program in Solar and Heliospheric Physics.
Brosius Jeffrey W.
Rabin Douglas M.
Thomas Robert J.
No associations
LandOfFree
EUNIS And SOHO Observations Of A Cool Transient Brightening In The Quiet Sun does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with EUNIS And SOHO Observations Of A Cool Transient Brightening In The Quiet Sun, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and EUNIS And SOHO Observations Of A Cool Transient Brightening In The Quiet Sun will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1029458