Vector Magnetograph Data from the Solar Physics Branch, NASA/MSFC

The Vector Magnetograph built and maintained at NASA Marshall Space
Flight Center (MSFC) is a dedicated instrument to observe the solar
vector magnetic field. The instrument has been upgraded regularly to
improve performance. Data taken with the vector magnetograph have been
archived for observations made during the following time intervals:

Feb. - Dec. 1980 (The first year of SMM)
Mar. 1984 - Apr. 1986
Apr. 1987 - Mar. 1988
Sep. 1989 - present (coaligned H-alpha data, too)

These data are archived on magnetic tapes and on optical disks; they
are unprocessed, i.e., they are the basic polarimetric intensities and
not magnetic field components.

The data are made available for scientific work at no cost but
sometimes with a time delay depending on work loads from the staff.
Contour maps of uncalibrated field components can be generated in a
fairly short time; in these cases the MSFC staff would ask to be
acknowledged in any publications. If the request is for calibrated
data, magnetic field extrapolations, calculation of electric currents
in the solar corona, etc., these involve more extensive work and would
generally be done as a collaboration.

Computer programs for the following field extrapolation calculations are
in use:
Schmidt potential
Teuber et al. potential
Nakagawa et al. linear force-free (FF)
Alissandrakis linear FF
Wu et al. nonlinear FF

During campaigns, like the MAX'91 program of solar observing campaigns, data
may be made available to the campaign via the network.

Vector magnetographs can be accessed from:
http://magaxp1.msfc.nasa.gov/magmore.shtml