Abstract
It is shown that the photo-ionization by the extreme ultraviolet radiation of the Sun is not likely to change seriously the initial degree of ionization ( x 1, see sections 4 and 5) of the chromospheric plasma during its passage to the Earth's distance. Thus, the plasma ejected from an active region of the Sun can contain an appreciable amount of neutral hydrogen atoms. The development of the main phase of geomagnetic storms and the formation of the ring current belt by such an incompletely ionized solar plasma are discussed.
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