In 1929, he was awarded a Ph . D . in his new field, writing his thesis on " A search for element 87 by analysis of positive rays " under the supervision of Henry DeWolf Smyth.
2.
There is " zero " magnetic field " surrounding the solenoid ", that is the whole point of the effect . . . A " negative or positive ray " that " purturbs " the field ? ?)
3.
In 1916, Birkeland was probably the first person to successfully predict that the solar wind behaves as do all charged particles in an electric field : " From a physical point of view it is most probable that solar rays are neither exclusively negative nor positive rays, but of both kinds ".
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