View source for Astronomy:Stratospheric Aerosol and Gas Experiment


The '''Stratospheric Aerosol and Gas Experiment''' ('''SAGE''') is a series of [[Earth:Remote sensing|remote sensing]] satellite instruments used to study the chemical composition of [[Earth:Atmosphere of Earth|Earth's atmosphere]]. Specifically, SAGE has been used to study the Earth's [[Physics:Ozone layer|ozone layer]] and aerosols at the [[Earth:Troposphere|troposphere]] through the [[Earth:Stratosphere|stratosphere]]. The SAGE instruments use solar occultation measurement technique to determine chemical concentrations in the atmosphere. Solar occultation measurement technique measures sunlight through the atmosphere and ratios that measurement with a sunlight measurement without atmospheric [[Physics:Attenuation|attenuation]]. This is achieved by observing sunrises and sunsets during a satellite orbit. Physically, the SAGE instruments measure ultraviolet/visible energy and this is converted via algorithms to determine chemical concentrations. SAGE data has been used to study the atmospheres aerosols, ozone, water vapor, and other trace gases.

== History ==
There has been 4 series of SAGE instruments:
* SAGE I - Flew on the [[Astronomy:Explorer 60|Explorer 60]] satellite.<ref name="SAGE II">{{cite web|url=http://sage.nasa.gov/SAGE1/|title=SAGE I|publisher=NASA|url-status=dead|archive-url=https://web.archive.org/web/20130214151924/http://sage.nasa.gov/SAGE1/|archive-date=14 February 2013|date=April 1996|access-date=4 March 2013}} {{PD-notice}}</ref>

* SAGE II - Flew on the [[Engineering:Earth Radiation Budget Satellite|Earth Radiation Budget Satellite]] (ERBS).<ref name="II">{{cite web|title=SAGE II: Understanding the Earth's Stratosphere|date=April 1996|publisher=NASA|access-date=12 March 2011 |url=http://www.nasa.gov/centers/langley/news/factsheets/SAGE.html}} {{PD-notice}}</ref>

* SAGE III - Flew on the Meteor-3M No.1.<ref name="3M">{{cite web|url=http://www-sage3.larc.nasa.gov/about/meteor-3m.php|date=20 September 2007|access-date=12 March 2011 |publisher=NASA|title=Meteor-3M Mission|url-status=dead|archive-url=https://web.archive.org/web/20101218085207/http://www-sage3.larc.nasa.gov/about/meteor-3m.php|archive-date=18 December 2010}} {{PD-notice}}</ref>

* [[Astronomy:SAGE III on ISS|SAGE III on ISS]], was launched on the [[Engineering:SpaceX CRS-10|SpaceX CRS-10]] mission using a [[Engineering:Falcon 9|Falcon 9]] with [[Engineering:SpaceX Dragon 2|Cargo Dragon]]. It was launched on 19 February 2017 and installed on the [[Astronomy:International Space Station|International Space Station]] (ISS).<ref name="III-ISS">{{cite web|url=http://www-sage3.larc.nasa.gov/missions/about-sage-iii-on-iss/|archive-url=https://web.archive.org/web/20161118030041/https://www-sage3.larc.nasa.gov/missions/about-sage-iii-on-iss/|url-status=dead|archive-date=18 November 2016|access-date=21 November 2015|publisher=NASA|title=About SAGE III on ISS}} {{PD-notice}}</ref>

== References ==
{{Reflist|30em}}

== External links ==
* [https://web.archive.org/web/20130213223341/http://sage.nasa.gov/ SAGE on ISS]

[[Category:Aerosol measurement]]


{{Sourceattribution|Stratospheric Aerosol and Gas Experiment}}