Sciences and Exploration Directorate

Polarized Submillimeter Ice-cloud Radiometer (PolSIR)


Flight Project


In Development



The PolSIR instrument – short for Polarized Submillimeter Ice-cloud Radiometer – will help humanity better understand Earth’s dynamic atmosphere and its impact on climate by studying ice clouds that form at high altitudes throughout tropical and sub-tropical regions. The PolSIR mission consists of two 12U CubeSats, each equipped with a cross-track scanning polarized submillimeter radiometer in two spectral bands with center frequencies at 325 and 684 GHz.

Key Staff
    Photo of high-altitude ice cloud as seen from the International Space Station