1. The Helioseismic & Magnetic Imager – Magnetic Investigations
J.Todd Hoeksema for the HMI Magnetic Team
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 ??
THoeksema,
JSchou, HAO
YLiu, JSchou,
*HAO
Continuum
Brightness
RBush, JSchou
20 B-Polar, Large/Small Int
EBenevolenskay
ABSTRACT
The HMI investigation will study the origin of solar variability and will characterize and understand the Sun’s interior and the various components of magnetic activity.
Teams are forming to address the principle scientific goals of the mission. These topics, outlined in the HMI Science Plan ( encompass a broad range of science that will be enabled by HMI magnetic field observations. The Co-I team desperately needs your participation to take full advantage of the opportunities provided.
Polarized filtergrams around the Fe I spectral line at nm made with the HMI tunable narrow band filter enable determination of all three components of the vector photospheric magnetic field in half arc second pixels with a cadence of five minutes at all times.
Development of pipeline processing modules to produce the full menu of data products is currently underway. The final data products are presently being defined. Some STANDARD products will be computed at all times, others will be produced On DEMAND or during times of special interest. Some data products requiring intensive processing will only be produced On REQUEST when 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
Stokes I, Q, U, and V;
Vector Magnetograms
(|B|, inclination,
azimuth, …)
Filtergrams
Science Objectives, Observables, and Magnetic Data Product Teams
Preliminary Magnetic Topic Group Affiliations
(Please Sign Up!!)
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
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#1] – 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
VECTOR MAGNETIC MAPS
Full disk vector field maps (standard)
(full resolution, 10-minute cadence)
Vector magnetic field maps (on-request)
(full disk, full resolution, 2-minute cadence)
(AR patches, full resolution, 2-minute cadence)
(full resolution, 6-hour cadence)
1-hour average vector magnetic field maps (standard)
(full disk, full resolution, 6-hour cadence)
Vector magnetic field maps in AR patches (standard)
(in heliographic coord., full res., 6-hour cadence)
Vector magnetic field maps (on-demand)
(full disk, full resolution, 30-minute cadence)
(AR patches, full resolution, 30-minute cadence)
“Ambiguous” Observables
Magnetograms (standard)
(full disk, full resolution,
10-minute cadence?)
Magnetograms (on-request)
2-minute cadence)
Stokes I, Q, U and V (on-request).
(AR patches, full resolution,
1-hour average)
SYNOPTIC PRODUCTS
Synoptic map (standard)
Synoptic frame (standard)
(in a cadence of 1-day)
Daily update Synoptic map (standard)
Synoptic frame (on-demand)
(in a cadence of 30-minute)
Daily update Synoptic map (on-demand)
Synoptic frame (on-request)
(in a cadence of 2-minute)
Daily update Synoptic map (on-request)
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
HMI Sun Testing- Early Images
First Dopplergram
First Magnetogram
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
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