NASA. SUN. Scientific photography. Solar telescope DUNN. Th - Lot 236

Lot 236
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NASA. SUN. Scientific photography. Solar telescope DUNN. Th - Lot 236
NASA. SUN. Scientific photography. Solar telescope DUNN. This is an image of the solar chromosphere covering 166 Mm x 166 Mm taken at the heart of the 6563 Å hydrogen-alpha spectral line with the two-dimensional interferometric spectrometer (IBIS) of the Dunn Solar Telescope, operated by the National Solar Observatory (NSO/AURA/NSF), at Sunspot, New Mexico. It shows the dark sunspot, but also numerous fibrils that are thought to indicate the expansion of the magnetic field connecting regions of opposite magnetic polarity.Vintage chromogenic print. Numbering in the margin on the front. Legend on label on the back. 25,4 X 20,4CM with margins.
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