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We plan to observe solar recombination lines of hydrogen H39a (2.70mm), H40a (2.92mm), H41a 3.15mm), H42a (3.38mm) at FCRAO for oaring distance from disk center to limb. Preliminar calculations following the Hoang-Binh model (1982) show a turn from emission lines into absorption lines around n=38.
Bruna I. Grimberg
"High-n solar recombination lines", Proc. SPIE 2250, International Conference on Millimeter and Submillimeter Waves and Applications 1994, 22508O (30 November 2017); https://doi.org/10.1117/12.2303329
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Bruna I. Grimberg, "High-n solar recombination lines," Proc. SPIE 2250, International Conference on Millimeter and Submillimeter Waves and Applications 1994, 22508O (30 November 2017); https://doi.org/10.1117/12.2303329