Solar radiation enters the Earth's atmosphere with a portion being scattered by clouds and aerosols.

Processing, archiving and distributing Earth science data
at the NASA Langley Research Center

When did TES begin taking measurements?

TES began making measurements on August 22, 2004. The routine TES observation mode is to produce global survey standard products spanning 16 orbits on a 50% duty cycle, or approximately every other day. The "off" days can be used for special observations such as intensive campaigns to observe volcanic eruptions, biomass burning, and pollution events.