Poloidal Radius The radius of the actual loop structure. For a doughnut, it is measured from the center to the edge of the pastry (not from the center of the hole). See also Toroidal Radius.
Proton A positively charged elementary particle.
Half of the distance from one loop footpoint to the other loop footpoint. For a doughnut, it is the distance from the center of the doughnut hole to the center (circular axis) of the pastry. See also Poloidal Radius.
 See also: Solar atmosphere, Radiation belt, Earth, Spectral line, Spectrometer
  
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