Science Objectives, Observables, and Magnetic Data Product Teams

1
SP51B-13
The Helioseismic Magnetic Imager Magnetic
Field Data Products The Helioseismic and
Magnetic Imager (HMI) instrument on the Solar
Dynamic Observatory (SDO) spacecreaft will begin
observing the solar photospheric magnetic field
continuously after launch and commissioning in
early 2009. This paper describes the HMI
magnetic processing pipeline and the expected
data products that will be available. The
full-disk line-of-sight magnetic field will be
available every 45 seconds with 1 resolution.
Comparable vector measurements collected over a
three-minute time interval will ordinarily be
averaged for at least 10 minutes before
inversion. Useful Quick-Look products intended
only for forecasting and planning purposes will
be available a few minutes after observation.
Standard final science data products will be
computed within 36 hours and made available
through the SDO Joint Science Operations Center
(JSOC). Three kinds of magnetic science data
products have been defined standard, on-demand,
and on-request. Standard products, such as
frequently updated synoptic charts, are made all
the time on a fixed cadence. On-demand
products, such as high-cadence full-disk
disambiguated vector magnetograms, will be
generated whenever a user asks for
them. On-request products, such as
high-resolution time serieos of MDH model
solutions, will be generated as resources allow.
This paper describes the observations,
magnetograms, synoptic, and synchronic products,
and field model calculations that will produced
by the HMI magnetic pipeline.
Magnetic Processing Scheduling There are four
schedules for Magnetic Field data
processing Quick Look Routine processing on
data available within minutes of
observation 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 (HiRes MHD time series for a
big flare CME campaign On Request Completed
when system resources allow
Vector magnetic quantities B, filling factor,
inclination to l-o-s, azimuth, magnetic velocity,
uncertainties.

• Science Objectives, Observables, and Magnetic
  Data Product Teams
• Preliminary Magnetic Topic Group Affiliations
• Please Participate!
• Observables
• Line-of-sight magnetograms THoeksema, JSchou,
  HAO, KD Leka
• Vector magnetograms YLiu, JSchou, HAO,
  SCouvidat, KD Leka
• Continuum Brightness RBush, JSchou, NHurlburt,
  TBerger, PBoerner, JKuhn
• Magnetic Data Products
• Line of sight magnetic maps THoeksema,
  EBenevolenskaya, TBai
• Vector field maps YLiu, THoeksema,
  EBenevolenskaya, ANorton, KD Leka, Blites,
  BBSO-JJing, VYurchyshyn, A. Pevtsov
• Coronal field extrapolations AIA YLiu,
  KSchrijver, XPZhao, KHayashi, LM-MCheung
• Coronal Solar Wind XPZhao, KHayashi,
  THoeksema, SAIC-Linker
• Surface Plasma Flows JBeck, YLiu, KHayashi,
  EBenevolenskaya, TBai, BWelsh, STWu, RShine,
  BDePontieu, TBerger, SAIC-Linker
• Science Objectives
• 1-1A Tachocline - AKosovichev
• 2-1C Meridional Circulation - AKosovichev
• 3-1B Differential Rotation - AKosovichev
• 4-1D Near-surface Shear Layer - JBeck
• 5-2A Activity Complexes EBenevolenskaya,
  TBai, THoeksema, KHayashi, NHurlburt,
  VGaizauskus, JHarvey

• Science Data Products HMI Magnetic Field Images
• Pipeline
• One-minute
• signed Br on full disk
• magnetic line-of-sight velocity on full disk
• continuum intensity on full disk
• 10-minute
• inverted B on full disk
• disambiguated B on selected patches
• 3-hour
• disambiguated vector field on full disk, use QL
  results as appropriate
• 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
• 10-minute full disk disambiguated vector field

• Quick Look Observables HMI Magnetic Field
  Images
• One Minute (Doppler cadence, 45 seconds)
• 1-minute line-of-sight velocity
• 1-minute line-of-sight magnetic field (or Br or
  signed total l-o-s mean field)
• 1-minute continuum intensity
• 1-minute indices, movies computed from the above
• 10-Minute (fastest vector field cadence averaged
  over 6 cycles, 90s6)
• 10-minute global quick-look inversions
• inversion method may depend on flux/noise
• map of inversion method provided
• selected rectangular patches will be
  disambiguated
• indices for patches computed from 10-minute field
  values
• 1-hour
• Synoptic maps of B_r at lower resolution
  (1-degree, tbd)
• Vector field updated only in patches

Magnetic Field Model Products Produced as
Standard, On-demand, and On-request
products Automated Identification of AR
Patches PFSS Model various resolutions NLFFF
Model AR patches only, daily MHD Models daily
low-resolution Monthly major events in
hi-res Open Field Foot Point Maps Surface Flow
Maps ILCT, DAVE