1. The Helioseismic & Magnetic Imager – Magnetic Field Data Products
SP51B-13
The Helioseismic & Magnetic Imager – Magnetic Field Data Products
J. Todd Hoeksema for the HMI Magnetic Team
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 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.
HMI after delivery to GSFC
HMI Complete and Awaiting Integration onto SDO
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
HMI Vector Field Pipeline & Products
Calibration and Correction of Filtergrams
Magnetic Observables
HMI Data
Increase s/n:
Standard HMI resolution
Rebinned data
(retains temporal resolution)
Averaged data
(retains spatial resolution)
Vector Magnetic
Field Maps
180 Degree Ambiguity Solver
Fast (potential or lfff);
Slower but better.
Full disk vector magnetic field:
In image coordinates
In spherical coordinates
Vector magnetic field in active regions:
In heliographic coordinates
Synoptic maps of vector field
(B_r, B_theta, B_phi):
Standard synoptic charts;
Synoptic frames;
Daily update synoptic maps.
Field Inversion (10m)
Stokes I, Q, U, and V;
Vector Magnetograms
(|B|, inclination,
azimuth, …)
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
180
-180
3097
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
6-2B – Active Regions – THoeksema, EBenevolenskaya, TBai, KHayashi, NHurlburt
7-2C – Sunspots – TBai, THoeksema, EBenevolenskaya, NHurlburt
8-2D – Irradiance Variations – RBush, TBerger, PBoerner
9-3A – Magnetic Shear – YLiu, JBeck, KHayashi, AKosovichev, BBSO-VYurchyshyn
10-3B – Flare/CME Magnetic Config – KHayashi, LM?, YLiu, XPZhao, TBai, AKosovichev, UC-B,BBSO-HWang
11-3C – Flux Emergence – YLiu, JBeck, EBenevolenskaya, LHayashi, LM, BLites, KD Leka, BBSO-HWang
12-3D – Mag. Carpet & Heating [AIA] – KHayashi, KSchrijver, JBeck, EBenevolenskaya
13-4A – Coronal Energetics [AIA] – KSchrijver, YLiu, EBenevolenskaya, XPZhao, KHayashi, KD Leka, MCheung, UC-B,BBSO HWang
14-4B – Large-scale B – Ph. + Cor. - KHayashi, THoeksema, EBenevolenskaya, XPZhao
15-4C – Solar Wind – Evol. + Struct. - KHayashi, THoeksema, XPZhao, MWSO, CISM, LM-SFuselier, SAIC-ZMikic
16-5A – Far-side Activity – PScherrer, CLindsey, DBraun, SAIC
17-5B – Predicting AR Emergence - TBai
18-5C – IMF Bs Events – XPZhao, YLiu, KHayashi, BBSO-VYurchyshyn, Hu, HINODE, LM-SFuselier, SAIC-ZMikic
19 – Magnetic Topology – YLiu, MSU-DLongcope, Barnes, SAIC-Titov
20 – Polar & Multi-scale Field – EBenevolenskaya, THoeksema
SYNOPTIC PRODUCTS
SYNCHRONIC PRODUCTS
Synoptic & Synchronic maps (CR, standard)
Synoptic frame (standard)
(in a cadence of 1-day)
Daily update Synoptic & Synchronic maps
(standard cadence of 1-day)
Synoptic frame (on-demand)
Synchronic frame (on-demand)
Daily update Synoptic map (on-demand)
(in a cadence of 30-minute)
Vector Synoptic frame (on-demand)
Synoptic or Synchronic frame (on-request)
(in a cadence of 2-minute)
Daily update Synoptic map (on-request)
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
On Request
100-second disambiguated patches
100-second IQUV
Anything else
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, 90s*6)
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
6-hour
Quick-look full-disk disambiguated vector field
Coronal and
Solar wind Properties
Surface Plasma Flows
HMI Science Analysis Plan – Magnetic Topics
9-3A Magnetic Shear
1-1A Tachocline
3-1B Differential Rotation
2-1C Meridional Circulation
4-1D Near-Surface Shear Layer
6-2B Active Regions
7-2C Sunspots
12-3D Magnetic Carpet+Heating
10-3B Flare/CME Mag. Config
11-3C Flux Emergence
13-4A Coronal Energetics AIA]1
14-4B Large-scale B, Ph+Cor
15-4C Solar Wind + Evol, Struct
16-5A Far-side Activity Evolution
17-5B Predicting A-R Emergence
18-5C IMF Bs Events
Filtergrams
Line-of-sight
Magnetograms
Vector
Line-of-Sight
Magnetic Field Maps
Coronal Magnetic Field
Extrapolations (non MHD)
Vector Magnetic
Field Maps
Magnetic Data
Products
Magnetic
Observables
HMI Data
5-2A Activity Complexes, Cycle
8-2D Irradiance Variations
19 Topology Structure over AR
THoeksema
YLiu
EBenevolenskaya, TBai
TBai
RBush
JBeck, YLiu,
XPZhao, KHayashi
YLiu, Schrijver
AKosovichev
JBeck
LM, KHayashi
KHayashi, LM
YLiu, LM
Schrijver, YLiu
XPZhao
PScherrer
KHayashi
Lundstedt
THoeksema,
JSchou, HAO
YLiu, JSchou,
*HAO, CORA
Continuum
Brightness
RBush, JSchou
20 B-Polar, Large/Small Int
EBenevolenskay
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
HMI Data Analysis Pipeline
Doppler
Velocity
Heliographic
Doppler velocity
maps
Tracked Tiles
Of Dopplergrams
Stokes
I,V
Filtergrams
Continuum
Brightness
Tracked full-disk
1-hour averaged
Continuum maps
Brightness feature
Solar limb parameters
I,Q,U,V
Full-disk 10-min
Averaged maps
Line-of-sight
Magnetograms
Vector Magnetograms
Fast algorithm
Inversion algorithm
Egression and
Ingression maps
Time-distance
Cross-covariance
function
Ring diagrams
Wave phase
shift maps
Wave travel times
Local wave
frequency shifts
Spherical
Harmonic
Time series
To l=1000
Mode frequencies
And splitting
Brightness Images
Line-of-Sight
Magnetic Field Maps
Coronal magnetic
Field Extrapolations
Coronal and
Solar wind models
Far-side activity index
Deep-focus v and cs
maps (0-200Mm)
High-resolution v and cs
maps (0-30Mm)
Carrington synoptic v and cs
Full-disk velocity, v(r,Θ,Φ),
And sound speed, cs(r,Θ,Φ),
Maps (0-30Mm)
Internal sound speed,
cs(r,Θ) (0<r<R)
Internal rotation Ω(r,Θ)
(0<r<R)
Vector Magnetic
Field Maps
HMI Data
Data Product
HMI Data Processing
Level-1