The SOI-MDI Dynamics Program: Observing the Solar Cycle

Details The SOI-MDI Dynamics Program: Observing the Solar Cycle The SOI-MDI Dynamics Program: Observing the Solar Cycle

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.9205b&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #92.05; Bulletin of the American Astronomical Society, Vol. 31, p.987

Astronomy and Astrophysics

Astronomy

Scientific paper

The Michelson Doppler Imager instrument on the SOHO spacecraft has been observing the Sun over the last three years. The MDI Dynamics Program provides nearly continuous full disk Doppler measurements of the solar photosphere with 4 arc-second resolution for periods of 60 to 90 days each year. Three of these Dynamics periods have been completed: 23 May to 24 July 1996, 13 April to 14 July 1997, 9 January to 10 April 1998. A fourth Dynamics observing period began on 13 March and is scheduled to continue through mid July. These observations provide a unique view of the evolution of the Sun in the early part of the solar cycle, both from interior flows deduced by helioseimic analysis and changes in large scale surface motion. Details of the Dynamics programs will be presented along with an overview of current results. This research is supported by the SOI-MDI NASA grant NAG5-3077 at Stanford University.

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