The magnetic field structure in the Crab Nebula from observations of high-energy and ultra-high-energy gamma-rays

The flux of gamma rays from the Crab Nebula is calculated using a model based on concepts developed by Pikel'ner and Shklovskii. The calculations agree well with EGRET data at high-energies (10(2)-10(4) MeV). This provides new independent confirmation of the validity of our picture of the structure of the outer zone of the nebula (from the filaments to the outer edge), in particular, of the nebula magnetic field as a set of dipole fields where all particles emitted during the pulsar lifetime accumulate. The good agreement between the calculated and observed fluxes of ultra-high-energy (>10 TeV) gamma rays is consistent with the region from the Crab pulsar to the "wisps" being a source of inverse Compton gamma rays.