Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...324..381p&link_type=abstract
Astronomy and Astrophysics, v.324, p.381-394
Astronomy and Astrophysics
Astrophysics
41
Atomic Data, Atomic Processes, Sun: Activity, Sun: Flares, Sun: X-Rays, Gamma Rays
Scientific paper
Theoretical intensities of the Fe XVII X-ray lines due to transitions 2p^6^-2p^5^3d (near 15Å) and 2p^6^-2p^5^3s (near 17Å) are presented, and compared with solar flare and active region spectra. The ratio of the 15Å lines to the 17Å lines is a function of temperature T_e_, but for solar spectra this is not of practical use because of the resonance scattering of the intense 15.015Å line. Instead we use the ratio of a nearby Fe XVIII line to obtain T_e_. We find very satisfactory correspondence between solar spectra and synthetic spectra based on calculated line intensities with appropriately chosen T_e_ apart from the 15.015Å line, which is sometimes less intense than its theoretical value, apparently owing to resonance scattering. Spectra emitted by DITE and JET tokamak plasmas with measured T_e_ and N_e_ are also considered. A predicted density variation of the ratio of the Fe XVII lines at 17.051Å and 17.096 Å is confirmed, and using Abel inversion techniques applied to a sequence of DITE spectra with different radial distances good agreement is found between the theoretical temperature variation of the I(15.015Å)/I(16.776Å) line ratio and that derived from these spectra. We conclude that our calculated Fe XVII line intensities are very reliable and may therefore be used in future analysis.
Barnsley R.
Bhatia Anand K.
Coffey I. H.
Greer James C.
Keenan Francis P.
No associations
LandOfFree
FeXVII X-ray lines in solar coronal and laboratory plasmas. 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 FeXVII X-ray lines in solar coronal and laboratory plasmas., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and FeXVII X-ray lines in solar coronal and laboratory plasmas. will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1877625