Welcome to GUVI!

The Global Ultraviolet Imager (GUVI) is one of four instruments that constitute the TIMED spacecraft, the first mission of the NASA Solar Connections program. The TIMED spacecraft is being built by Johns Hopkins University Applied Physics Laboratory and GUVI is a joint collaboration between JHU/APL and the Aerospace Corporation. TIMED will be used to study the energetics and dynamics of the Mesosphere and lower Thermosphere between an altitude of approximately 60 to 180 kilometers.


Coming in July 2017 - a new release of reprocessed GUVI data, now with calibration version 13. Details can be found here

An illustration of the moving auroral boundary and increasing brightness in the Lyman-Birge-Hopfield Short (or LBHS) nitrogen band during the recent St. Patrick's day storm (2015). As the storm develops, the auroral boundary moves to lower magnetic latitude and the LBHS intensity increases due to a rising energy flux of particles in the northern polar region. The magnetic latitude of the auroral boundary is plotted with the black triangles. Also shown for comparison is the concurrent value of Dst (red triangles and red scale on the right axis). Times shown are in UT.


  • Instrument Fabrication

  • TIMED Construction

Latest Results

see more data products see more images in the gallery

Page Last Modified: February 27, 2017