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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

classification astro-ph.SRastro-ph.IM
keywords coordinatevectordataactivefieldgridregionanalysis
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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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Forward citations

Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 19 citations worldwide. Full citation record

  1. Quantifying Suppression of Solar Surface Magnetic Flux Advection with Increasing Field Strength

    astro-ph.SR 2025-05 conditional novelty 6.0 of 10

    The horizontal advection speed of solar magnetic flux decreases smoothly with increasing vertical field strength, from roughly 110 m/s at 150 G to 10 m/s at 2500 G, and is fit by a fourth-degree polynomial.

  2. Current Helicity in Response to Coronal Mass Ejections

    astro-ph.SR 2025-07 conditional novelty 5.0 of 10

    Photospheric current helicity shows a pre-eruption decrease and post-eruption increase in an MHD model and in 58% and 92% of 50 observed eruptive flares, respectively.

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

    astro-ph.SR 2026-07 accept novelty 4.0 of 10

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

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