COSMIC RAYS HOW TO

Gamma-ray surveys (conducted from Earth-orbiting satellites) indicate that cosmic rays are strongly concentrated in the disk of the Milky Way Galaxy, with a much smaller percentage in the surrounding halo. Interstellar cosmic ray collisions also yield neutral pions, which decay quickly to produce high-energy gamma rays. Synchrotron radiation has been detected from supernova remnants such as the Crab Nebula, confirming their identification as potential cosmic-ray sources. There is general agreement between radio observations of the synchrotron radiation and the intensities calculated from the electron flux. The electrons and positrons travel along spiral paths in the galactic magnetic field and so generate synchrotron radiation, which is detected by radio telescopes. These pions have half-lives of about two hundred-millionths of a second and decay into muons the muons then decay and produce electrons, positrons, and neutrinos.

A small portion of the electrons do come from collisions between primary cosmic ray atomic nuclei and interstellar hydrogen, which produce charged mesons-mostly pions. Most of the electrons in the primaries are produced in the original cosmic ray sources that produce the primary nuclei.

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COSMIC RAYS HOW TO

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Cosmic rays