The Density of Coronal Null Points from Hinode and MDI

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dc.creatorLongcope, Dana
dc.creatorParnell, Clare
dc.creatorDeForest, Craig
dc.date2009-01-07
dc.date.accessioned2026-07-07T12:31:59Z
dc.date.available2026-07-07T12:31:59Z
dc.descriptionMagnetic 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: 0.003 null points per square Mm of solar surface.
dc.identifierhttps://arxiv.org/abs/0901.0865
dc.identifierhttp://arxiv.org/abs/0901.0865
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/216635
dc.subjectSolar and Stellar Astrophysics
dc.titleThe Density of Coronal Null Points from Hinode and MDI
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