The Helioseismic Magnetic Imager Magnetic Field Data Products

The Helioseismic & Magnetic Imager Magnetic Field Data Products J. Todd Hoeksema and the HMI Magnetic Field Team: Yang Liu, Keiji Hayashi, Xudong Sun, Jesper Schou, Sebastien Couvidat, Xuepu Zhao, Rick Bogart, Priya Desai Steve Tomczyk, Juan Borrero, Rebecca Centeno Elliot K. D. Leka, Graham Barnes, M Turmon, P Schuck, T. Wiegelmann And The Rest of the HMI Team Stanford, HAO, CORA, JPL, GSFC, MPS ABSTRACT The Helioseismic and Magnetic Imager (HMI) on NASA’s Solar Dynamics Observatory (SDO) routinely produces a wide variety of magnetic field data products including 45 -second line-of sight magnetograms, 12 minute vector field times series in HMI Active Region Patches (HARPs), synoptic maps and synchronic frames, model calculations of the coronal field and solar wind, and near-real-time parameters for space weather. Other products, such as surface flow maps, can be produced on demand or on request. We present examples of data products collected during the first year of operations and compare some of these with measurements from other observatories, including the now-dormant MDI. LWS 1 May 2011 HMI Space Weather and Quick-Look Browsing Products Quick-look data are available within a few minutes of observation. A more complete set of definitive science data products is offered about a day later and comes in three types. ‘’Pipeline products, ’’ such as full disk vector magnetograms, will be computed for all data on an appropriate cadence. A larger menu of ‘’On Demand’’ products, such as Non-Linear Force Free Field snapshots of an evolving active region, will be produced whenever a user wants them. Less commonly needed ‘’On Request’’ products that require significant project resources, such as a high resolution MHD simulation of the global corona, will be created subject to availability of resources. Further information can be found at the SDO Joint Science Operations Center web page, jsoc. stanford. edu Generally HMI space weather and quick-look browsing products are computed in near real time from quick look SDO data. They may be used for space weather forecasting or real time monitoring and display. They should not be used for scientific analysis, except perhaps to compare the quality of preliminary and definitive products. HMI space weather and quick-look products will be coordinated with the Heliophysics Events Knowledge Base. These data products will complement the AIA Quick Look Browse Products. Magnetic Products Full Disk Line-of-sight magnetograms (Blos) - 45 -sec; 4 K*4 K resolution Vector magnetogram, inverted & disambiguated - 12 hour Movie of Blos - 12 -day history, updated each 90 seconds ME Vector Field Inversion Results After Many Iterations: Eta 0, Inclination, Azimuth Doppler width*sqrt(eta 0), Field Strength, V_los S 0, S 1, and Chi**2 in 300**2 Region Vector Field, AIA Loops, and Computed Current Density Time Series for the 14 February 2011 X-class Flare HMI Active Region Patches (HARPs) Identification of active region patches - 12 minute Vector magnetic field in major HARPs, disambiguated - 12 minute Time series of HARP indices (updated every 12 min) Location, orientation, separation, total flux, net flux, delta-B, helicity, non-potentiality, complexity, field gradient, other Alerts based on indices Synoptic Maps Synchronic Frame - radial field estimate - 96 -minute Evolved Carrington/Synchronic map - 6 hour HMI Active Region Patches Are Tracked Across the Disk Synchronic Frame for 2010. 08. 12 to 200 G – Lo. S - Resolution 3600 * 1440. Vector Magnetic Field in HMI Active Region Patches Are Computed Every 12 Minutes Science Data Products – HMI Magnetic Field Images Standard Pipeline 45 -second Magnetic line-of-sight velocity on full disk Continuum intensity on full disk Vlos on full disk 12 -min Inverted vector B on full disk 12 -min Disambiguated B on selected patches 6 -hour Disambiguated vector field on full disk On Demand • 3 -second level 1. 5 filtergrams (limited number) • High cadence disambiguated vector field patches • High cadence full disk disambiguated vector field Far Side Products Far side active region map - daily Movie of global sun activity - 54 -day, updated daily DAVE 4 VM Derived Surface Flow Maps Full-disk Velocity - snapshot every 12 minutes Full-disk Intensity - 12 minute Full-disk Line Depth - 12 minute Full-disk and HARP Overlays of AIA and HMI Blos - 90 -sec update, movie Alerts & Indices - 12 minute - HARP intensity/flare detection Horizontal Flow from LCT in HARPs (daily) Coronal Field Models (daily, weekly) Global - PFSS, Hybrid, MHD, Footpoints HARPs/Local - PF, NLFFF, MHD Field line maps, source surface maps, AIA overlays, MHD 1 AU Predictions - WSA velocity, polarity, field strength, etc (daily) Polar Field Estimate (monthly) Below: Detail at Southern Boundary Saturates at 20 G Magnetic Field Model Products Automated Identification of AR Patches and other features PFSS Model – Various resolutions NLFFF Model – AR patches, daily MHD Models – Daily low-resolution – Monthly major events in hi-res Open Field Foot Point Maps Surface Flow Maps – ILCT, FLCT DAVE 4 VM Other Products HMI Science Analysis Plan – Magnetic Topics HMI Data Vector Field, Vertical Current AIA Loops, NLFFF Field Lines Radial Filtergrams Magnetic Observables Magnetic Data Products Line-of-Sight Magnetic Field Maps 1 -1 A Tachocline 2 -1 C Meridional Circulation 3 -1 B Differential Rotation 4 -1 D Near-Surface Shear Layer 5 -2 A Activity Complexes, Cycle On Request • 135 -second disambiguated patches • 135 -second IQUV • Anything else Polar correction Line-of-sight Magnetograms Vector Magnetic Field Maps 6 -2 B Active Regions 7 -2 C Sunspots 8 -2 D Irradiance Variations 9 -3 A Magnetic Shear Comparison of HMI and MDI Polar Field Observation Lo. S Field Comparison of MDI and HMI 10 -3 B Flare/CME Mag. Config Medium resolution Zero Level (Mean Field Plus Offset) of HMI, MDI, and WSO Vector Magnetograms Low resolution Coronal Magnetic Field Extrapolations (non MHD) 11 -3 C Flux Emergence 12 -3 D Magnetic Carpet+Heating 13 -4 A Coronal Energetics AIA]1 Surface Plasma Flows 14 -4 B Large-scale B, Ph+Cor 15 -4 C Solar Wind + Evol, Struct 16 -5 A Far-side Activity Evolution 17 -5 B Predicting A-R Emergence The whole surface distribution of Calculated open field regions using the photospheric field with spatial grid N=9, 22, 45, 90. Red and blue denote of 3600 x 1440 , 360 x 180, & 72 x 30. inward and outward polarity. Continuum Brightness Coronal and Solar Wind Properties 18 -5 C IMF Bs Events 19 Topology Structure over AR 20 B-Polar, Large/Small Int