Narrow band images in 7 emission lines
Unprecedented simultaneous multi-wavelength coronal observations in seven emission
lines, and white light, are presented on this page. The main goal was to observe
coronal emission of all possible Fe ions, in the visible wavelength range, from
Fe IX to Fe XV. These lines provide an excellent diagnostic tool for
probing the physics of the solar corona. Only two Fe ions in this sequence of Fe
ionization states were not observed. The first one was Fe XII which has no
suitable emission line in the visible or near infrared wavelength range. The
second one was Fe XV. Although Fe XV has a strong emission line at 706.0 nm,
its observation is problematic because of the presence of a very strong helium
line at 706.5 nm. Therefore we observed Ni XV instead, since it has
relatively similar diagnostic capabilities as Fe XV. In addition to the six
Fe and Ni ions emission lines, an attempt was made to detect emission from
neutral hydrogen (H-alpha) in the extended corona. More details about
instrumentation, image processing and
scientific results can be found in
this ApJ paper.
This graph shows ionization equilibrium curves for observed spectral lines.
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Miloslav Druckmüller |
Institute of Mathematics, Faculty of Mechanical Engineering
Brno University of Technology, Czech Republic
Page last update: 8.8.2014