Quick Facts: TIMED Solar EUV Experiment (SEE)

Mission Introduction

TIMED Spacecraft

The TIMED (Thermosphere Ionosphere Mesosphere Energetics and Dynamics) mission is studying the influences of the Sun and humans on the least explored and understood region of Earth’s atmosphere – the Mesosphere and Lower Thermosphere/Ionosphere (MLTI). (Courtesy NASA/JHU/APL)

The mesosphere and lower thermosphere/ionosphere, atmospheric layers that act as the gateway between Earth and space, are the least explored regions of the Earth’s atmosphere. TIMED (Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics) studies how the Sun and human activity affect these regions, where the Sun’s energy first becomes part of the Earth’s environment.

LASP Roles

LASP provides:

  • The Solar EUV Experiment (SEE)
  • SEE Principal Investigator, Tom Woods

LASP Instrument

The Solar EUV Experiment (SEE) is one of the four scientific instruments aboard the TIMED spacecraft. The SEE instrument is determining the irradiance of the highly variable solar extreme ultraviolet (EUV) radiation, one of the major energy sources for the upper atmosphere. SEE measurements are fundamental for the TIMED mission’s investigation of the energetics in the tenuous but highly variable layers of the atmosphere above 60 km.

For more information about the TIMED/SEE mission, see:

Quick Facts

SEE Instrument Labels

The Solar Extreme Ultraviolet Experiment (SEE) is comprised of a spectrometer and a suite of photometers designed to measure the solar soft X-rays, extreme-ultraviolet and far-ultraviolet radiation that is deposited into the MLTI region. (Courtesy LASP)

Launch date: December 7, 2001
Launch location: Vandenberg Air Force Base, California
Launch vehicle: Delta II 7920-10
Mission target: Earth orbit
Mission duration: 10 years
Other key dates:

  • SEE science operations began: January 22, 2002
  • SEE normal operations ceased: April 1, 2011

Other organizations involved:

  • Johns Hopkins University’s Applied Physics Laboratory (JHU/APL)
  • NCAR/High Altitude Observatory
  • Naval Research Laboratory
  • Space Environment Technology (SET)