Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2012-03-09
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
8 pages, 6 figures, to appear in the proceedings of the 2nd ATST-EAST workshop (9.-11.11.2011, Washington/DC), ASP Conference
Scientific paper
Observations of chromospheric spectral lines near and beyond the solar limb provide information on the solar chromosphere without any photospheric contamination. For ground-based observations near and off the limb with real-time image correction by adaptive optics (AO), some technical requirements have to be met, such as an AO lock point that is independent of the location of the field of view observed by the science instruments, both for 1D and 2D instruments. We show how to obtain simultaneous AO-corrected spectra in Ca II H, Ha, Ca II IR at 854 nm, and He I at 1083 nm with the instrumentation at the German Vacuum Tower Telescope in Izana, Tenerife. We determined the spectral properties of an active-region macrospicule inside the field of view in the four chromospheric lines, including its signature in polarization in He I at 1083 nm. Compared to the line-core intensities, the Doppler shifts of the lines change on a smaller spatial scale in the direction parallel to the limb, suggesting the presence of coherent rotating structures or the passage of upwards propagating helical waves on the surfaces of expanding flux tubes.
Beck Ch.
Rezaei Rashid
No associations
LandOfFree
Chromospheric multi-wavelength observations near the solar limb 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 Chromospheric multi-wavelength observations near the solar limb, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chromospheric multi-wavelength observations near the solar limb will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-302659