SOFIE

Solar Occultation for Ice Experiment
SOFIE was launched on April 25, 2007 as part of the AIM (Aeronomy of Ice in the Mesosphere) mission. SOFIE will use solar occultation to measure ozone, water, carbon dioxide, methane, nitric acid and aerosol/particle extinction from the troposphere to the thermosphere. These measurements will be accomplished using differential absorption radiometry with eight channel pairs covering wavelengths from 290 nanometers to 5.26 microns.

 


AIM

SOFIE is one of three instruments onboard the Aeronomy of Ice in the Mesosphere (AIM) satellite. The objective of AIM is to study polar mesospheric clouds (PMCs) and the environment in which they form.

The SOFIE measurements of particle extinctions and size distributions will be of particular importance in the study of Polar Mesospheric Clouds (PMCs) which are harbingers of global warming and climate change. In addition, the instrument should have enough sensitivity to measure the cosmic smoke layer in the mesosphere where meteoroids are vaporized upon atmospheric entry.

One other unique aspect of the SOFIE mission is that the SOFIE sun sensor will use a focal plane array image sensor to track the sun. The array will provide an accurate measurement of the vertical extent of the solar image as it squashes due to refraction in the lower atmosphere. This highly accurate determination of the solar image will provide the data needed to perform temperature retrievals using refraction angles; these retrieved temperature profiles will have a high degree of accuracy and vertical resolution.

 

Links:

SOFIE Home Page

AIM Mission at Hampton University

AIM Mission at NASA - NASA AIM Press Kit

SOFIE

 

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Last updated May 14, 2007 by Theresa A. Lilly