Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-02-08
Astrophys.J. 630 (2005) L189
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures
Scientific paper
10.1086/468183
Due to their high intensity of emission in the O VI 1031.9 and 1037.6A lines, even small sunspots on the solar disk can strongly influence the intensity of the radiative scattering component of O VI lines in the corona. Observations of O VI disk spectra show a 1032/1038 line intensity ratio of >2.6 in a sunspot compared to quiet disk values of 2. The enhancement of the 1032 line in comparison to the 1038 is likely due to interaction between molecular hydrogen emission from the sunspot and the chromospheric O5+. Modeling shows that a contribution from sunspots increases the coronal O VI 1032/1038 intensity ratio to values considerably higher than those achieved with a quiet disk or coronal hole spectrum. Therefore a re-examination of flow velocities derived from UVCS/SOHO streamer observations must be made. This modeling demonstrates that the inclusion of sunspots, when present, may lead to non-zero outflow velocities at lower heights in streamer cores in contrast to some existing model results.
Morgan Huw
Rifai Habbal Shadia
No associations
LandOfFree
The Impact of Sunspots on the Interpretation of Coronal Observations of the O VI Doublet 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 The Impact of Sunspots on the Interpretation of Coronal Observations of the O VI Doublet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Impact of Sunspots on the Interpretation of Coronal Observations of the O VI Doublet will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-697642