Abstract
Solar flare observations have been performed with the multichannel L.P.S.P. experiment on board OSO-8 NASA Satellite. Simultaneous H and K Caii, h and k Mgii, Lα and Lβ Hi profiles have been recorded on the plage just before the flare, during the flare onset and relaxation phases. The different behaviour of line profiles and intensities during the flare is evidenced and indicates a downward propagation with relaxation times increasing from the upper part to the lower part of the chromosphere related to line formation processes. Using the Hɛ observed profile, an upper limit of 8 × 1013 cm-3 is derived for the electron density.
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Lemaire, P., Choucq-Bruston, M. & Vial, J.C. Simultaneous H and K Ca ii, h and k Mg ii, Lα and Lβ H i profiles of the April 15, 1978 solar flare observed with the OSO-8/L.P.S.P. experiment. Sol Phys 90, 63–82 (1984). https://doi.org/10.1007/BF00153785
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DOI: https://doi.org/10.1007/BF00153785