geomagnetic cutoff

geomagnetic cutoff

[¦jē·ō·mag¦ned·ik ′kə‚dȯf]
(geophysics)
The minimum energy of a cosmic-ray particle able to reach the top of the atmosphere at a particular geomagnetic latitude.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.