The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: SHARPs – Space-Weather HMI Active Region Patches

• Published in: Solar physics Vol. 289; no. 9; pp. 3549 - 3578
• Main Authors: Bobra, M. G., Sun, X., Hoeksema, J. T., Turmon, M., Liu, Y., Hayashi, K., Barnes, G., Leka, K. D.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.09.2014; Springer Nature B.V
• Subjects: Astrophysics and Astroparticles; Atmospheric Sciences; Continuity; Deviation; Doppler effect; Magnetic fields; Mathematical analysis; Onboard; Physics; Physics and Astronomy; Solar activity; Solar Cycle 24 as seen by SDO; Solar flares; Solar observatories; Solar physics; Space Exploration and Astronautics; Space Sciences (including Extraterrestrial Physics; Vectors (mathematics); Flares, relation to magnetic field; Instrumentation and data management; Active regions, magnetic fields
• ISSN: 0038-0938; 1573-093X
• DOI: 10.1007/s11207-014-0529-3

A new data product from the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO) called Space-weather HMI Active Region Patches (SHARPs) is now available. SDO/HMI is the first space-based instrument to map the full-disk photospheric vector magnetic field with high cadence and continuity. The SHARP data series provide maps in patches that encompass automatically tracked magnetic concentrations for their entire lifetime; map quantities include the photospheric vector magnetic field and its uncertainty, along with Doppler velocity, continuum intensity, and line-of-sight magnetic field. Furthermore, keywords in the SHARP data series provide several parameters that concisely characterize the magnetic-field distribution and its deviation from a potential-field configuration. These indices may be useful for active-region event forecasting and for identifying regions of interest. The indices are calculated per patch and are available on a twelve-minute cadence. Quick-look data are available within approximately three hours of observation; definitive science products are produced approximately five weeks later. SHARP data are available at jsoc.stanford.edu and maps are available in either of two different coordinate systems. This article describes the SHARP data products and presents examples of SHARP data and parameters.