Solar EUV Irradiance Measurements from STEREO
Donald R. McMullin [mcmullind@thessrc.com], Space Systems Research Corporation,
Alexandria, Virginia
STEREO (Solar TErrestrial RElations Observatory) was launched October 2006. The
twin-spacecraft mission is designed to provide a unique and revolutionary view of the SunEarth System. The two nearly identical observatories - one ahead of Earth in its orbit, the
other trailing behind - trace the flow of energy and matter from the Sun to Earth. In March
2007, the SECCHI instrument suite began the synoptic observation program. Here we report
on measurements of the solar EUV irradiance derived from the synoptic data set from the
Extreme-UltraViolet Imaging telescope (EUVI) from both STEREO spacecraft. This dataset
includes the most recent extended solar minimum and captures the initial rise of the next
solar cycle. These flux values will be presented as well as comparisons with other available
data sets and solar activity indices.