Image Credit: L. J. Lanzerotti, Bell Laboratories, Lucent Technologies, Inc.
|On January 20-21, 1994 Canadian television, radio, telephone and scientific operations were interrupted when two communications satellites (Anik E-1 and Anik E-2) experienced operational problems, within a days time of each other, after being submersed in a cloud of high velocity electrons. The momentum wheel control circuitry in both satellites was affected. It took Telesat Canada operators 8 hours to regain control of Anik E-1 and many months to regain control of Anik E-2. The root of the problem has been traced back to deep dielectric discharges within the spacecraft circuitry after many days of being bombarded by dangerous levels of high speed electrons.|
Last modified prior to September, 2000 by the Windows Team
The source of this material is Windows to the Universe, at http://windows2universe.org/ from the National Earth Science Teachers Association (NESTA). The Website was developed in part with the support of UCAR and NCAR, where it resided from 2000 - 2010. © 2010 National Earth Science Teachers Association. Windows to the Universe® is a registered trademark of NESTA. All Rights Reserved. Site policies and disclaimer.