The MDI observation program was terminated on 12 April 2011
MDI has been superseded by its offspring, SDO/HMI.
MDI data will continue to be available via these pages for a while. It will be accessible via the SDO/JSOC data center so long as the SDO mission continues.
MDI is a project of the Stanford-Lockheed Institute for Space Research and is a joint effort of the Solar Oscillations Investigation (SOI) in the W.W. Hansen Experimental Physics Laboratory of Stanford University and the Solar and Astrophysics Laboratory of the Lockheed-Martin Advanced Technology Center.
SOI and the MDI Team are part of an international collaboration to study the interior structure and dynamics of the Sun. The MDI team was responsible for the design and fabrication, and now for the operation, of the MDI instrument on board the Solar and Heliospheric Observatory (SOHO) spacecraft.