NLTE analysis of SUMER filament observations on SOHOThe observations of hydrogen Lyman delta, epsilon, six and seven lines are described. These data were acquired by the solar ultraviolet measurement of emitted radiation (SUMER) spectrograph onboard the Solar and Heliospheric Observatory (SOHO). All the spectral lines were calibrated to absolute intensities. The multilevel NLTE code was used to evaluate the theoretical line profiles of the four Lyman lines studied. The line cores of all these lines are good indicators of the temperature structure of the filament. The study showed that the line wings are sensitive to the gas pressure. A steep temperature increase in the prominence-corona transition region seems to be consistent with the observed intensities in the line cores of the Lyman lines.
Document ID
19990028093
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Heinzel, P. (Ceskoslovenska Akademie Ved Ondrejov Czechoslovakia)
Schmieder, B. (Observatoire de Paris-Meudon France)