SOHO/Michelson Doppler Imager (MDI) and Solar Oscillations Investigation (SOI) Data Archive

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.

The primary objective of the SOI investigation is to investigate the
solar interior using the tools of helioseismology. To fulfill the
potential of helioseismology, observations free of the distortions
from the Earth's atmosphere and free of diurnal data gaps must be
obtained. The primary data set consists of precision measurements of
the line-of-sight surface velocity field from which the oscillation
modes of the solar interior can be deduced.

In addition to the primary objectives, the SOI program includes
investigation of several associated science objectives. They are
called associated objectives because they involve the study of
observable solar phenomena using traditional techniques, though they
share the same goal of understanding the structure and variability of
the Sun. These investigations are no less important to the
understanding of the solar structure and dynamics than the primary
objectives.

All SOHO/MDI data are available from the public SOHO data archive:
http://sohowww.nascom.nasa.gov/data/archive.html

Mirror archives are available at:
SOHO Archive at Rutherford Appleton Laboratory, UK.:
http://trace.solararchive.rl.ac.uk/soho/

SOHO Archive at the Institut d'Astrophysique Spatiale, France:
http://idc-medoc.ias.u-psud.fr/

SOHO Archive at Osservatorio Astronomico di Torino, Torino, Italy:
http://solar.to.astro.it/