NOAA Observations of Solar Irradiance

Rodney Viereck [], NOAA, Space Environment Center, Boulder, Colorado.

For nearly 30 years, measurements of solar irradiance have been made from NOAA “operational” spacecraft. Some of the earliest measurements were of x-ray and UV irradiances. More recently, EUV irradiance measurements have been added to the suite of NOAA sensors. In the future, visible spectra and total irradiance observations will be made from NOAA spacecraft at which time, NOAA will be monitoring solar irradiance across the spectrum. The primary difference between NOAA and NASA observations of solar irradiance is that while NASA is constantly pushing the technological envelop and striving for new and better observations, NOAA’s objective is to provide long-term stable measurements. Therefore, once a set of observations is initiated on a NOAA spacecraft, there is a high likelihood that those observations will continue into the indefinite future. These are the long-term, continuous observations that will best address the issues of solar influences on climate. In this presentation, I will present past, present, and future observations of solar irradiance as observed by instruments on operational NOAA spacecraft. These include the EUV and X-Ray sensors on GOES, the UV irradiances from the SBUV on POES as well as the UV, spectral, and total irradiances to be made by the TSIS and other sensors on NPOESS.