Abstract
A highly nonlinear whistler wave packet has been generated in a large laboratory plasma. The wave field exceeds the ambient field, locally reverses its direction and exhibits a topology of a spheromak. It propagates along the ambient magnetic field at a speed that decreases with amplitude. Electrons are strongly energized in the spheromak. Anisotropies create whistler instabilities. The whistler spheromak becomes a propagating source for secondary whistlers, a new phenomenon in magnetic turbulence.
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