Alice (spacecraft instrument)

[1] Alice is a small telescope with a spectrograph and a special detector with 32 pixels each with 1024 spectral channels detecting ultraviolet light.

[3] Alice has an off-axis telescope which sends light to a Rowland-circle spectrograph, and the instrument has a field of view of 6 degrees.

[5][6] Alice is intended, among its capabilities, to detect ultraviolet signatures of noble (aka inert) gases including helium, neon, argon, and krypton.

[3] ALICE was built and operated by the Southwest Research Institute for NASA's Jet Propulsion Laboratory.

PLM provides time resolution, where as HM consistently requires same amount of memory, regardless of exposure length.