Files in this directory:

HaBlurDif*:
    One image, the sharper one, from a I+Q and I-Q pair; blurred with
    smooth2.pro (near-gaussian smoothing) and then subtracted from its
    unblurred self, to mimic the effect of pure seeing-caused blurring
    on the polarization measurement. Normalized by the sum of the two,
    and scaled to the range [-0.05,+0.05]. Compare with the observed
    polarization, from the difference (I+Q) - (I-Q) after translation
    alignment. The sequence number is the offset into the 'file5' file
    on the CD.

HaPol*:
    Observed polarization, also scaled to [-0.05,+0.05]. Compare to above.

HaRaw_014508.gif and friends:
    Raw H-alpha core images from the IVM observations of the 1992 Oct 27
    flare. File names include the ending time of the observation set.
    The set from 01:45:25 is the one which shows the strongest "polarization",
    and coincides temporally with the HXR spike. Notice that the third
    frame in the set is unusually sharp--and the last one is particularly
    blurry. The difference of these two frames is used to derive the
    Stokes U parameter. For comparison, the sets from 01:45:08 and 01:45:41,
    which immediately precede and follow, show neither striking frame-
    to-frame sharpness changes nor much polarization signal. And a later
    set, at 01:48:20, shows negative U polarization and the last frame
    in the set is sharper than the third.

HaBlur56.gif
    Plot of a row thru the brightest kernel of the 921027_0145 flare,
    comparing the laplacian of the image to the perceived U polarization.
    The correspondence is quite striking.