Magnetic maps of the whole Sun

Farside images computed from MDI sound travel time analysis
Earth-side images are magnetic flux observed by SOHO-MDI
These files are updated daily.

SEE NEW METHOD AT http://soi.stanford.edu/data/full_farside

Most recent MDI far-side image
Go to MDI far-side images
Far-side images observed by SOHO-SWAN
SOHO home page

These images are whole-Sun maps of magnetic activity. They show 360 degrees of longitude in the Carrington coordinate system normally used for solar observations. The map extent is from south pole to north pole in an equal area projection. The solar equator and each 60 degrees of longitude are marked.

The Earthside, or near-side, data are smoothed magnetic flux as measured by MDI. The images are shown to 70 degrees from disk center. Each magnetogram takes only one minute to observe.

The farside images are maps of wave speed variations with locations of faster wave speed shown darker. These darker regions indicate locations where there is an accumulation of magnetic field on the far surface. The farside images can only be computed out to 45 degrees from the farside disk center as (un)seen from Earth. A full 24-hours of MDI surface velocity data is used to compute each image.

A new whole-Sun map is computed for each 12 hours. The SOHO-MDI quicklook data is used in an automated procedure.

The method for estimating far-side magnetic flux was developed by Lindsey and Braun of the Solar Physics Research Corp., Tucson Arizona. The method was described in NASA and ESA press releases in March 2000. Details are published in the journal Solar Physics vol 192.

Five sample images here show the Sun over a span of 2 1/2 rotations (the Sun rotates once every 27 days) from 1 March 2001 to 24 April 2001. A very large active region known as AR9393 formed during this time. "Clicking" on any of these images will produce a view showing the selected image along with the images for 13.5 days before and 13.5 days later.

1 March 2001. Carrington map of magnetic flux (Earthside) and inferred flux (farside). Region 9393 will be at Carrington longitude 154 Latitude 17N. There is no sign of the large region on this date.
15 March 2001. Map of magnetic flux (Earthside) and inferred flux (farside). Region 9393 was at longitude 154 Latitude 17N. The region was first detected on the farside on 12 March and could be seen to be large on the 13th.
28 March 2001. Region 9393 was at longitude 154 Latitude 17N. The region contained the largest spot complex of the cycle (to date).
11 April 2001. Region 9393 was still at longitude 154 Latitude 17N. The region continued to evolve as it rotated across the far side of the Sun.
24 April 2001. Region 9393 at longitude 154 Latitude 17N. The region came back to the front-side of the Sun in late April.

These images are computed for each 12 hours and are usually available by noon (Pacific time) each day for the previous day. They can be viewed in one very large scrollable page or in groups of two solar rotations. They are also available collected as movies.

Farside Movie of March-May 2001 in MPEG-1 or Quicktime format.
Farside Movie of March-April 2001 in MPEG-1 or Quicktime format.
Note that when you view this data as a movie or simply scroll through the collected sets, the images of the Sun move from right to left with time. This is because the maps are fixed in the frame of the average rotation rate of the Sun but the part of the Sun we can see from Earth moves as the Sun rotates.

Scrollable set of images of whole Sun in one LONG, very SLOW loading page.

Separate pages of 2 rotations (54 days) for Carrington rotations
Rotation 2070, Starts May 13, 2008
Rotation 2069, Starts April 16, 2008
Rotation 2068, Starts March 20, 2008
Rotation 2067, Starts February 21, 2008
Rotation 2066, Starts January 25, 2008
Rotation 2065, Starts December 29, 2007
Rotation 2064, Starts December 1, 2007
Rotation 2063, Starts November 4, 2007
Rotation 2062, Starts October 8, 2007
Rotation 2061, Starts September 10, 2007
Rotation 2060, Starts August 14, 2007
Rotation 2059, Starts July 18, 2007
Rotation 2058, Starts June 21, 2007
Rotation 2057, Starts May 24, 2007
Rotation 2056, Starts April 27, 2007
Rotation 2055, Starts March 31, 2007
Rotation 2054, Starts March 4, 2007
Rotation 2053, Starts February 4, 2007
Rotation 2052, Starts January 8, 2007
Rotation 2051, Starts December 12, 2006
Rotation 2050, Starts November 14, 2006
Rotation 2049, Starts October 18, 2006
Rotation 2048, Starts September 21, 2006
Rotation 2047, Starts August 25, 2006
Rotation 2046, Starts July 28, 2006
Rotation 2045, Starts July 1, 2006
Rotation 2044, Starts June 4, 2006
Rotation 2043, Starts May 8, 2006
Rotation 2042, Starts April 10, 2006
Rotation 2041, Starts March 14, 2006
Rotation 2040, Starts February 15, 2006
Rotation 2039, Starts January 18, 2006
Rotation 2038, Starts December 22, 2005
Rotation 2037, Starts November 25, 2005
Rotation 2036, Starts October 28, 2005
Rotation 2035, Starts October 1, 2005
Rotation 2034, Starts September 4, 2005
Rotation 2033, Starts August 8, 2005
Rotation 2032, Starts July 11, 2005
Rotation 2031, Starts June 14, 2005
Rotation 2030, Starts May 18, 2005
Rotation 2029, Starts April 21, 2005
Rotation 2028, Starts March 25, 2005
Rotation 2027, Starts February 25, 2005
Rotation 2026, Starts January 29, 2005
Rotation 2025, Starts January 2, 2005
Rotation 2024, Starts December 5, 2004
Rotation 2023, Starts November 8, 2004
Rotation 2022, Starts October 12, 2004
Rotation 2021, Starts September 14, 2004
Rotation 2020, Starts August 18, 2004
Rotation 2019, Starts July 22, 2004
Rotation 2018, Starts June 25, 2004
Rotation 2017, Starts May 28, 2004
Rotation 2016, Starts May 1, 2004
Rotation 2015, Starts April 4, 2004
Rotation 2014, Starts March 8, 2004
Rotation 2013, Starts February 9, 2004
Rotation 2012, Starts January 13, 2004
Rotation 2011, Starts December 17, 2003
Rotation 2010, Starts November 19, 2003
Rotation 2009, Starts October 23, 2003
Rotation 2008, Starts September 26, 2003
Rotation 2007, Starts August 29, 2003
Rotation 2006, Starts August 2, 2003
Rotation 2005, Starts July 6, 2003
Rotation 2004, Starts June 9, 2003
Rotation 2003, Starts May 13, 2003
Rotation 2002, Starts April 15, 2003
Rotation 2001, Starts March 19, 2003
Rotation 2000, Starts February 20, 2003
Rotation 1999, Starts January 23, 2003
Rotation 1998, Starts December 27, 2002
Rotation 1997, Starts November 30, 2002
Rotation 1996, Starts November 2, 2002
Rotation 1995, Starts October 6, 2002
Rotation 1994, Starts September 9, 2002
Rotation 1993, Starts August 13, 2002
Rotation 1992, Starts July 16, 2002
Rotation 1991, Starts June 19, 2002
Rotation 1990, Starts May 23, 2002
Rotation 1989, Starts April 26, 2002
Rotation 1988, Starts March 30, 2002
Rotation 1987, Starts March 2, 2002
Rotation 1986, Starts February 3, 2002
Rotation 1985, Starts January 7, 2002
Rotation 1984, Starts December 10, 2001
Rotation 1983, Starts November 13, 2001
Rotation 1982, Starts October 17, 2001
Rotation 1981, Starts September 19, 2001
Rotation 1980, Starts August 23, 2001
Rotation 1979, Starts July 27, 2001
Rotation 1978, Starts June 30, 2001
Rotation 1977, Starts June 3, 2001
Rotation 1976, Starts May 6, 2001
Rotation 1975, Starts April 9, 2001
Rotation 1974, Starts March 13, 2001
Rotation 1973, Starts February 13, 2001
Rotation 1972, Starts January 17, 2001
Rotation 1971, Starts December 21, 2000
Rotation 1970, Starts November 23, 2000
Rotation 1969, Starts October 27, 2000
Rotation 1968, Starts September 30, 2000
Rotation 1967, Starts September 2, 2000
Rotation 1966, Starts August 7, 2000


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