The Magnetometer - Electron Reflectometer (MAG/ER)
instrument on Mars Global
Surveyor was built and run from NASA Goddard Space Flight Center. The image shown here was published as Figure 1 of the article:
Connerney, J.E.P., M.H. Acuña, P.J. Wasilewski, G. Kletetschka, N.F. Ness, H. Rème, R.P. Lin, and D.L. Mitchell (2001) The Global
Magnetic Field of Mars and Implications for Crustal Evolution. Geophysical Research Letters
4015-4018. The image is public domain.