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Article: Recent findings from K.P. Reardon and co-authors highlight research in astrophysics.
- Article from:
- Physics Week
- Article date:
- August 11, 2009
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According to a study from Florence, Italy, "Filtergrams obtained in Ca II H, Ca II K, and Ha are often employed as diagnostics of the solar chromosphere. The vastly disparate appearance between the typical filtergrams in these different lines calls into question the nature of what is actually being observed."
"We investigate the lack of obvious structures of magnetic origin such as fibrils and mottles in on-disk Ca II H and K images. We directly compare a temporal sequence of classical Ca II K filtergrams with a co-spatial and co-temporal sequence of spectrally resolved Ca II 854.2 images obtained with the Interferometric Bidimensional Spectrometer (IBIS), ...