Reversal-free Ca ii H profiles : a challenge for solar chromosphere modeling in quiet internetwork


Aims. We study chromospheric emission to understand the temperature stratification in the solar chromosphere. Methods. We observed the intensity profile of the Ca iiH line in a quiet Sun region close to the disk center at the German Vacuum Tower Telescope. We analyze over 10 line profiles from internetwork regions. For comparison with the observed profiles… (More)

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