Journal
ASTRONOMY & ASTROPHYSICS
Volume 503, Issue 2, Pages 577-587Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/200811595
Keywords
Sun: photosphere; Sun: chromosphere; Sun: magnetic fields; Sun: faculae, plages
Categories
Funding
- University of Florence
- University of Rome
- MIUR
- MAE
- National Science Foundation
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The structure and energy balance of the solar chromosphere remain poorly known. We used the imaging spectrometer IBIS at the Dunn Solar Telescope to obtain fast-cadence, multi-wavelength profile sampling of Ha and Ca II 854.2 nm over a sizable two-dimensional field of view encompassing quiet-Sun network. We provide a first inventory of how the quiet chromosphere appears in these two lines by comparing basic profile measurements in the form of image displays, temporal-average displays, time slices, and pixel-by-pixel correlations. We find that the two lines can be markedly dissimilar in their rendering of the chromosphere, but that, nevertheless, both show evidence of chromospheric heating, particularly in and around network: Ha in its core width and Ca II 854.2 nm in its brightness. We discuss venues for improved modeling.
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