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 new Suomi NPP data ceases on Nov. 2, 2026. Users should transition to alternative products.
Suomi NPP data announcement