The Helioseismic Magnetic Imager Magnetic Pipeline J Todd

The Helioseismic & Magnetic Imager Magnetic Pipeline J. Todd Hoeksema for the HMI Magnetic Team ABSTRACT The Helioseismic and Magnetic Imager (HMI) will provide frequent full-disk magnetic field data after launch of the Solar Dynamics Observatory (SDO), currently scheduled NET November, 2009. 16 megapixel line-of-sight magnetograms (Blos) will be recorded every 45 seconds. A full set of polarized filtergrams needed to determine the vector magnetic field requires 90 seconds. Filtergrams Magnetic Observables Magnetic Data Products Line-of-Sight Magnetic Field Maps THoeksema Vector Magnetic Field Maps Line-of-sight Magnetograms Quick-look data will be available within a few minutes of observation. Quick-look space weather and browse products must have identified users, and the list currently includes full disk magnetograms, feature identification and movies, 12 minute disambiguated vector fields in active region patches, time evolution of AR indices, synoptic synchronic frames, potential and MHD model results, and 1 AU predictions. YLiu THoeksema, JSchou, HAO Coronal Magnetic Field Extrapolations (non MHD) Vector Magnetograms A more complete set of definitive science data products will be offered about a day later and come 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. SPD 2009: 17. 01 HMI Science Analysis Plan – Magnetic Topics HMI Data YLiu, JSchou, *HAO, CORA YLiu, Schrijver Surface Plasma Flows JBeck, YLiu, Continuum Brightness RBush, JSchou Coronal and Solar wind Properties XPZhao, KHayashi 1 -1 A Tachocline AKosovichev 2 -1 C Meridional Circulation AKosovichev 3 -1 B Differential Rotation AKosovichev 4 -1 D Near-Surface Shear Layer JBeck 5 -2 A Activity Complexes, Cycle EBenevolenskaya, TBai 6 -2 B Active Regions THoeksema 7 -2 C Sunspots TBai 8 -2 D Irradiance Variations RBush 9 -3 A Magnetic Shear YLiu 10 -3 B Flare/CME Mag. Config LM, KHayashi 11 -3 C Flux Emergence YLiu, LM 12 -3 D Magnetic Carpet+Heating KHayashi, LM 13 -4 A Coronal Energetics AIA]1 Schrijver, YLiu 14 -4 B Large-scale B, Ph+Cor KHayashi 15 -4 C Solar Wind + Evol, Struct KHayashi 16 -5 A Far-side Activity Evolution PScherrer 17 -5 B Predicting A-R Emergence TBai 18 -5 C IMF Bs Events XPZhao 19 Topology Structure over AR Lundstedt 20 B-Polar, Large/Small Int EBenevolenskay Magnetic Processing Scheduling Further information can be found at the SDO Joint Science Operations Center web page, jsoc. stanford. edu There are four classes of Magnetic Field data processing Quick Look Routine processing on data available within minutes of observation Science Data Products – HMI Magnetic Field Images Pipeline 45 -second Magnetic line-of-sight velocity on full disk Continuum intensity on full disk Vlos on full disk 12 -minute Inverted vector B on full disk Disambiguated B on selected patches 3 -hour Disambiguated vector field on full disk Standard Routinely completed for all data on regular cadence (e. g. Vector B) On Demand Completed for small fraction of data when interesting things happen or whenever requested by a qualified user (Hi. Res MHD time series for a big flare & CME campaign On Request Products, such as high-resolution time series of MDH model solutions, will be generated as resources allow. Completed when system resources allow On Demand • 3 -second level 1. 5 filtergrams (limited number) • 3 -minute (180 -second) spatially binned disambiguated vector field in patches • 6 -minute (360 -second) disambiguated patches • 12 -minute full disk disambiguated vector field HMI Space Weather and Quick-Look Browsing Products 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 DRAFT LIST – This list is preliminary and is not a commitment. Each product must have a prospective user. Comments welcome! Magnetic Products Full Disk Line-of-sight magnetograms (Blos) - 90 -sec; 1 K*1 K resolution Vector magnetogram, inverted & disambiguated - 12 hour Movie of Blos - 12 -day history, updated each 90 seconds Active Region Patches (ARPs) Identification of active region patches - 12 minute Vector magnetic field in major ARPs, disambiguated - 12 minute Time series of major ARP indices (since appearance, updated every 12 min Location, orientation, separation, total flux, net flux, delta-B, helicity, non-potentiality, complexity, field gradient, other Alerts based on indices Increased time resolution during alerts Blos at full spatial resolution in ARPs - updated each 90 seconds Synoptic Maps Synchronic Frame - radial field estimate - 96 -minute, reduced resolution Evolved Carrington/Synchronic map - 6 hour Far Side Products Far side active region map - daily Movie of global sun activity - 54 -day, updated daily Other Products Full-disk Velocity - snapshot every 12 minutes Full-disk Intensity - 12 minute Full-disk Line Depth - 12 minute Full-disk and ARP Overlays of AIA and HMI Blos - 90 -sec update, movie Alerts & Indices - 12 minute Irradiance, mean field, ARP intensity/flare detection Movies of ARPs in Intensity (updated hourly) Horizontal Flow from LCT in ARPs (daily) Coronal Field Models (daily, weekly) Global - PFSS, Hybrid - HCCSSS, MHD ARPs/Local - PF, NLFFF, MHD Field line maps, source surface maps, AIA overlays, MHD quantities Magnetic field global harmonic coefficients - daily 1 AU Predictions - WSA velocity, polarity, field strength, etc (daily) Coronal Holes - open foot points (daily) Polar Field Estimate (monthly) Note: Not all products are produced by HMI. On Request • 90 -second disambiguated patches • 90 -second IQUV • Anything else HMI Vector Field Pipeline & Products Increase s/n: Ø Standard HMI resolution Ø Rebinned data (retains temporal resolution) Ø Averaged data (retains spatial resolution) Magnetic Field Model Products Produced as Standard On-demand, and On-request 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 Magnetic Observables HMI Data Filtergrams HINODE Spectropolarimetric Magnetic Field Inverted with HMI-like Algorithm by S. Tomczyk & J. Borrero (HAO) The three panels show Inclination, Azimuth & Magnetic Field Strength as observed May 7, 2007 0 180 -180 0 Stokes I, Q, U, and V; Vector Magnetograms (|B|, inclination, azimuth, …) Vector Magnetic Field Maps 3097 Field Inversion (10 m) Calibration and Correction of Filtergrams 180 Degree Ambiguity Solver Ø Fast (potential or lfff); Ø Slower but better. Vector magnetic field in active regions: ØIn heliographic coordinates ØIn image coordinates Full disk vector magnetic field: ØIn image coordinates ØIn spherical coordinates Synoptic maps of vector field (B_r, B_theta, B_phi): ØStandard synoptic charts; ØSynoptic frames; ØDaily update synoptic maps.