... Up: Data Compression . ... Outside any protective magnetic fields, cosmic rays will produce many charged-particle events on the imaging detector, affecting as much as 10% of the field-of-view during a baseline 1000-second obervation. ... By ``rejecting'' cosmic rays, we are referring to techniques to digitally analyze image data and identify and discard cosmic ray events in the detector, preserving only clean data. ... We can identify and remove 99% of cosmic ray events on the NGST detector. ...