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On the Coordinate System of Space-Weather HMI Active Region Patches (SHARPs): A Technical Note

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arxiv 1309.2392 v3 pith:C3ART6ZU submitted 2013-09-10 astro-ph.SR astro-ph.IM

On the Coordinate System of Space-Weather HMI Active Region Patches (SHARPs): A Technical Note

classification astro-ph.SR astro-ph.IM
keywords coordinatevectordataactivefieldgridregionanalysis
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We describe the coordinate systems of two streams of HMI active region vector data. A distinction is made between (a) the 2D grid on which the field vector is measured (or sampled), and (b) the 3D coordinate established at each grid point, in which the field vector is presented. The HMI data reduction can involve coordinate changes on both, with those performed on the former termed "remapping", the latter "vector transformation". Relevant pipeline procedures are described. Useful examples are given for data analysis.

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Cited by 3 Pith papers

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  3. Investigation on the Relation between Active Regions' Compliance with Empirical Laws and Flare Productivity

    astro-ph.SR 2026-07 accept novelty 4.0

    Solar active regions' compliance with Hale's, Joy's, and helicity laws does not determine flare productivity; flux and size thresholds do.