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ACRIMSAT
The Active Cavity Radiometer Irradiance Monitor Satellite, or ACRIMSAT is a dedicated satellite and instrument that was one of the 21 primary observational components of NASA's Earth Observing System program. ACRIMSAT was launched on 20 December 1999 from Vandenberg Air Force Base as the secondary payload on a Taurus rocket along with KOMPSAT. It was placed into a high inclination, 700 km. sun-synchronous orbit from which the ACRIM3 instrument monitored total solar irradiance (TSI).〔(Composite TSI Time Series )〕 Contact with the satellite was lost on 14 December 2013.〔("Sun sets for a NASA solar monitoring spacecraft." ) ''Jet Propulsion Laboratory.'' Retrieved: 9 August 2015.〕
== History ==
ACRIM3 made measurements of the TSI since the start of its mission in April 2000. It extended the TSI measurement database begun by earlier ACRIM instruments on the NASA Solar Maximum Mission (ACRIM1: 1980-1989) and Upper Atmosphere Research Satellite (ACRIM2: 1991-2001).
ACRIMSAT/ACRIM3 tracked TSI during a 2004 transit of Venus and measured the 0.1% reduction in the solar intensity caused by the planet's shadow. It also recorded data for the 2012 Transit of Venus.〔(【引用サイトリンク】title=Catalog Page for PIA15820 )〕
On 14 December 2013, ACRIMSAT went silent, with attempts to reestablish contact proving unsuccessful. The mostly likely cause has been attributed to the failure of aging batteries. The defunct spacecraft will remain in orbit for approximately 64 years before returning to Earth.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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