Paper:	The Density of Coronal Null Points from Hinode and MDI
Volume:	415, The Second Hinode Science Meeting: Beyond Discovery-Toward Understanding
Page:	178
Authors:	Longcope, D.; Parnell, C.; DeForest, C.
Abstract:	Magnetic null points can be located numerically in a potential field extrapolation or their average density can be estimated from the Fourier spectrum of a magnetogram. We use both methods to compute the null point density from a quiet Sun magnetogram made with Hinode’s NFI and from magnetograms from SOHO’s MDI in both its high-resolution and low-resolution modes. All estimates of the super-chromospheric column density (z > 1.5 Mm) agree with one another and with the previous measurements: 3×10-3 null points per square Mm of solar surface.

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