Array of Low Energy X-ray Imaging Sensors

The Launch was provided by the United States Air Force Space Test Program on a Pegasus Booster on April 25, 1993.

ALEXIS scanned half the sky with its three paired sets of EUV telescopes, although it could not locate any events with high resolution.

Ground-based optical astronomers could look for visual counterparts to the EUV transients seen by ALEXIS by comparing observations made at two different times.

Analysis of the pre-flight x-ray throughput calibration data indicated that the peak on-axis effective collecting area for each telescope's response function ranges from 0.25 to 0.05 cm2.

Between ground station passes, data was stored in an on-board solid state memory of 78 Megabytes.

ALEXIS, with its wide fields-of-view and well-defined wavelength bands, complemented the scanners on NASA's Extreme Ultraviolet Explorer (EUVE) and the ROSAT EUV Wide Field Camera (WFC), which were sensitive, narrow field-of-view, broad-band survey experiments.