auroral zone blackout

auroral zone blackout

[ə′rȯr·əl ¦zōn ′blak‚au̇t]
(geophysics)
Communication fadeout in the auroral zone most often due to an increase of ionization in the lower atmosphere.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.