The Cloud Spectrometer and Impactor (CSI) is an in situ airborne probe that measures total condensed water (TCW) content in clouds. It consists of a combination of a counterflow virtual impactor (CVI) and a lightweight cloud droplet probe. It can measure cloud particles in the size range of 2 to 50 μm and has a typical sampling frequency of 1 second.
Delivery of Suomi National Polar-orbiting Partnership (Suomi NPP) satellite data products will cease on November 1, 2026. Data users should transition now to alternative products from NOAA-21 and NOAA-20.
Suomi NPP data announcement