2.3.1 spase://SMWG/Instrument/Meudon/Spectroheliograph Meudon Spectroheliograph 2020-07-01T13:21:00Z The spectroheliograph provides images of the solar photosphere (blue wing of the CaII K 3934 Angstrom line, or K1v) and chromosphere (centre of the CaII K 3934 Angstrom line, or K3; and H-alpha 6563 Angstrom). Data are acquired once a day by performing scans of the solar disk using a entrance slit and an exit slit. spase://SMWG/Person/Jean-Marie.Malherbe GeneralContact spase://vspo/Instrument/357 Imager Meudon Spectroheliograph 1980-01-02T00:00:00.000Z spase://SMWG/Observatory/Meudon