WSO Photograph The Wilcox Solar Observatory

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WSO Data: Mean Field Magnetograms Synoptic Charts Coronal Model Tables Other

The Wilcox Solar Observatory (WSO) began collecting daily observations of the Sun's global (or mean) magnetic field in May 1975 (Scherrer+1977), with the goal of understanding changes in the Sun and how those changes affect the Earth. That science is called space weather. Since May 1976 daily low-resolution maps of the Sun's magnetic field have been made at WSO, along with observations of solar surface motions. The observatory is located in the foothills just south of the Stanford University main campus.

Current WSO research topics include space weather, the large-scale magnetic field, and the solar cycle. The observatory and staff are also associated with the Helioseismic and Magnetic Imager (HMI) project on the Solar Dynamics Observatory (SDO) and the COFFIES DRIVE Science Center. HMI provides continuous real-time high-resolution solar observations of the velocity, intensity, and magnetic field from geosynchronous Earth orbit. The Solar Observatories Group previously operated the Solar Oscillations Investigation that uses the Michelson Doppler Imager (MDI) instrument on the SOHO spacecraft to observe the inside of the Sun.

More information is available concerning the Solar Observatories Group, the Hansen Experimental Physics Laboratory (HEPL), the Kavli Institute for Particle Astrophysics and Cosmology (KIPAC), and about the Experimental and Observational Astrophysics and Cosmology and Theoretical Astrophysics and Cosmology programs in the Stanford University Physics Department.

Stanford University operates WSO with funding provided by the National Science Foundation with Grant #1836370.
NASA funding for WSO ended in 2018. Historically WSO has been supported by NASA Heliophysics, the NSF, and the Office of Naval Research.
Prof. J. Todd Hoeksema serves as WSO director.

WSO Dedication Pictures of WSO, staff members and other local wildlife.

Solar Center Visit the SOLAR Center -- our award winning educational web site providing on-line activities to encourage and share the wonder of solar science exploration.

You can also learn about Space Science at Windows to the Universe.

When is Sunrise?

The Sky Above

** ** ** Announcements ** ** **

The Sun's polar field direction has reversed for Cycle 25.
The south in mid 2023 and the north in late 2023. The smoothed average in August 2023.
Local weather prevented continuous observations in winter 2023/2024.

WSO Solar Magnetic Field Observations

Magnetograms

Synoptic Charts of the Photospheric Magnetic Field

Computed Coronal Field Maps

Numerical Data Tables

Data request forms for Computed Coronal Magnetic Field Tables

The Mean Magnetic Field of the Sun

Warning: WSO Polarization Sensitivity was reduced from 16 December 2016 to 18 May 2017.
Mean field values have NOT been recalibrated and are a factor of about 1.55 too small during that interval.

Other Quantities

  • The computed tilt angle [Table] [.gif] [.ps] of the Heliospheric Current Sheet is related to the measured
  • Solar Polar Field Strength: table | [.gif] | [.ps] ||| North [.gif] | South [.gif]
         Since 2010: [.gif] | [.ps] ||  North: [.gif] | [.ps] ||  South: [.gif] | [.ps] |
       References
  • Zonal magnetic flux transport over nearly 5 solar cycles:
        Net+Total: [.gif]     Symmetric and Antisymmetric Components: [.gif]
  • Solar Dipole and Multipole Components
  • Sector Boundary Lists

    Calibration NOTES:
  • Related Items of Interest.
  • WTRs - WSO Task Reports
  • WTRs - WSO Technical Info
  • Schematics - WSO Technical Info
    The WSO Web Page Format and data analysis processing were updated in late 2006.
    Contents do not necessarily reflect the views of the NSF.
    Please send comments to Todd Hoeksema