Compact Spectral Irradiance Monitor

Miniaturizing technology to study spectral irradiance

The Compact Spectral Irradiance Monitor (CSIM) is a 6U CubeSat launched in late 2018 and decommissioned in February 2022. It will demonstrate next-generation technology for monitoring spectral solar irradiance. CSIM is a two-channel 6U CubeSat that includes a miniaturized version of the SIM instrument that flew on both SORCE and TSIS missions. It is designed to measure the solar spectral irradiance twice a day with amazing accuracy. The key detector that enables this level of accuracy, a vertically-aligned carbon nanotube electrical substitution radiometer, was developed jointly with the Sources and Detectors Group at NIST Boulder

Mission Class:


Mission Status:


LASP Roles:

Research, Instruments, Data, Mission Operations

Science Target:


Mission Focus:

Climate, Solar Irradiance

Primary Mission Site:

Launch date: December 3, 2018
End Date: February 2022

Lead Institution: LASP

Lead Funding Agency: NASA

Partners: University of Colorado Boulder, NASA Earth Science Division, NIST Synchrotron Ultraviolet Radiation Facility (SURF), Spaceflight Industries