University of Colorado at Boulder University of Colorado CU Home Search A to Z Index Map
Laboratory for Atmospheric and Space Physics

EVE Instrument Turns On and Re-Discovers the Van Allen Radiation Belts

February 18, 2010

EVE Instrument Turns On and Re-Discovers the Van Allen Radiation Belts

(click for larger image)


Satellite detectors are sensitive to energetic particles in the Van Allen radiation belts, and EVE is no exception. SDO was launched Feb. 11, 2010 from KSC and EVE was turned on today. During its first orbit with power, EVE’s Lyman-alpha photodiode had very low dark signal while at GEO altitudes (about 36000 km) but has larger signal at the lower altitudes. Why? EVE is designed with shielding to protect its detectors from the energetic electrons that dominate at GEO altitudes, but EVE sees the energetic protons that dominate in the Van Allen radiation belts that are lower in atltitude than GEO. Over the next couple of weeks, SDO will be transitioning from a highly ellipitical GEO transfer orbit into a circular GEO orbit.

«Return to the News page