The profiles of the Balmer Hα, Hβ, Hγ and Hδ lines have been measured for different electron densities N (N=3×1015...1×1016 cm-3) and for a magnetic field strength of H = 69 kgauss in the plasma region observed. The magnetic field has been created by a magnet coil surrounding a straight discharge tube. The energy necessary for the creation and maintenance of this field was stored in two condenser banks. The measurements showed a strong modification of the profiles of both the Hα and the Hβ lines by the magnetic field when compared with profiles emitted from magnetically free plasmas. On the other hand, there is only a small influence of the magnetic field on Hγ and Hδ. Concerning the Hα line, good agreement was found between the measured profiles and those calculated by Nguyen-Hoe, Drawin and Herman. The conditions under which the wing intensities of ordinary Stark profiles may be used for a determination of electron densities, in spite of the presence of a strong magnetic field, have been checked. A new method for measuring electron densities from line profiles in strongly magnetized plasmas is proposed. © 1969.
