The magnetogram was obtained at 17:00 UT on July 31, 1996, by the Imaging Vector Magnetograph at Mees Solar Observatory on Haleakala, Maui. Similar displays of current and archival IVM data are at http://www.solar.ifa.hawaii.edu/IVM/ivm.html.

This particular dataset has been reduced using the latest version of the ``derivative method'' (Jefferies, Lites & Skumanich, 1989, ApJ 343, 920, Jefferies & Mickey, 1991, ApJ 372, 694). The recent enhancements to the software include corrections for all the known systematic errors in the Stokes profile measurements. Image distortion and spurious polarization due to atmospheric seeing are corrected by using geometry information in simultaneous images from a second, broad-band camera.

The continuum image (upper left) is very similar to the Web display. The longitudinal magnetic field image (upper right) has been high-pass filtered to enhance pore structure, and the display saturated above 1000 G. The maximum field strength in the negative polarity region is about -700 G, and in the positive region about +3000 G. Display of the transverse magnetic field (lower left) is suppressed below 350 G, eliminating about 90% of the noise. The transverse field azimuth direction (lower right) is indicated by the color wheel in the lower left corner of the image.