MDI is the instrument of the Solar Oscillations Investigation on the Solar and Heliospheric Observatory. The SOHO spacecraft functioned well after launch in December 1995. Contact with SOHO was lost on June 25, 1998; the recovery process began immediately. Contact was reestablished in July/August and by October SOHO was once again operational. With the loss of its last remaining gyro, SOHO went off line again for several weeks at the end of 1998. SOHO has since been reprogrammed and has been working ever since. Because the antenna pointing no longer functions reliably, SOHO is now regularly rotated in what is now called keyhole operations.

Synoptic maps and movies provide the most complete available picture of solar magnetic fields over the whole surface.
Access to the most recent Michelson Doppler Imager Images

Our first (Jan 96) little movie of the Sun's magnetic field as seen from space was very exciting.
The Hinode spacecraft launched a decade later can do much better.

Where is Hinode?   Where is STEREO? STEREO Beacon Data

The sounds of the Sun (aiff; 5.2 MB=5.5 minutes) were produced from SOHO data by Sasha Kosovichev.

Links:

• HMI, the Helioseismic & Magnetic Imager on SDO
• The Solar Oscillations Investigation (MDI)
• The SOHO Mission and Archive
• The Wilcox Solar Observatory, WSO.
• The Stanford SOLAR Center
• The Solar Physics at Stanford University

• Abstract Service - Astrophysics Data System (ADS)

• Space Weather GONG

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• Organizations:
  
  AGU Space Physcis AAAS, AIP,
  SJ Astronomy Club and the Summer Science Program
  

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  The Palo Alto Christian Reformed Church, part of Classis Central California and the CRC
  Classical Christian Ethereal Library including an on-line Bible & Study
  Provichance - a reconciliation of providence and chance.

  the World Wildlife Fund and the Center for Public Justice
  
  

Book Club and our Book List

CV (1-page), Presentations: (-1998), recent(incomplete), and Publications: (<2001): recent (incomplete).