Thursday, December 16, 2010


Two satellite instruments aboard NASA's Solar Radiation & Climate Experiment (SORCE) mission the Total Solar Irradiance Monitor (TIM) and the Solar Irradiance Monitor (SIM) have made daily measurements of the sun's brightness since 2003. 

 The two instruments are part of an ongoing effort to monitor variations in solar output that could affect Earth's climate. Both instruments measure aspects of the sun's irradiance, the intensity of the radiation striking the top of the atmosphere. Instruments similar to TIM have made daily irradiance measurements of the entire solar spectrum for more than three decades, but the SIM instrument is the first to monitor the daily activity of certain parts of the spectrum, a measurement scientists call solar spectral irradiance.
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