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Early Magnetic Field Observations From HMI. 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, Ashley Crouch

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early magnetic field observations from hmi

Early MagneticFieldObservations From HMI

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, Ashley Crouch

M Turmon, P Schuck, T. Wiegelmann

The rest of the HMI Team

Stanford, HAO, CORA, JPL, GSFC, MPS

HMI 2010.05.20_19:19:30

Early HMI MagneticField Observations

abstract

Abstract

HMI, the Helioseismic and Magnetic Imager on SDO is producing a synoptic series of full-disk arc-second magnetograms.

Longitudinal field is determined every 45s and vector inversions computed every 12 minutes in patches.

Higher level products will be produced including tracked AR patches, synchronic frames, NLFFF and MHD coronal field models, and photospheric flow maps

Some quick-look products are available in minutes for space weather purposes.

Early HMI MagneticField Observations

hmi magnetic field observables
Line-of-sight magnetic field is computed from Doppler velocity in two polarizations, as for MDI.

Vector Field is computed from Stokes parameters derived from an independent set of polarized filtergrams.

The possibility of combining the two cameras is being explored to improve sensitivity.

The nominal line-of-sight cadence is 45 seconds. The basic vector field cadence is 90s or 135 seconds.

HMI MagneticField Observables

Early HMI MagneticField Observations

hmi magnetic field observables1
Vector field data products are the following quantities, uncertainties on each, and some covariances:

|B| - total flux

Filling factor (where possible)

Inclination (gamma) to the line of sight

Azimuth (phi) CCW relative to ‘up’ on the CCD camera

Magnetic line-of sight velocity

Data will be exported in a variety of coordinate systems: [Bx,By,Bz], [B_total,gamma,phi], and [Br,Btheta,Bphi]

HMI MagneticField Observables

Early HMI MagneticField Observations

slide5

Magnetic Processing Scheduling

There are four schedules for Magnetic Field data processing

  • Quick Look/Near Real Time
    • Routine processing of some data available within minutes of observation
  • Standard
    • Routinely completed for all data on regular cadence (e.g. Vector B) after about 25 hours.
  • 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
    • Products, such as high-resolution time series of MHD model solutions, will be generated as resources allow. Completed when system resources allow

Early HMI MagneticField Observations

slide6
Definitive Science Observables – HMI Magnetic Field Images

Standard Pipeline Observables

45-second

Magnetic line-of-sight field on full disk

Continuum intensity and line depth on full disk

Doppler velocity on full disk

12-minute

Inverted vector B on full disk

Disambiguated B on selected patches

IQUV

12-hour

Disambiguated vector field on full disk

On Demand

180-second spatially binned disambiguated vector field in patches

360-second disambiguated patches

12-minute full disk disambiguated vector field

On Request

90-second disambiguated patches

90-second or other cadence IQUV

Anything else

Early HMI MagneticField Observations

hmi 720s magnetogram
HMI 720s Magnetogram

Early HMI MagneticField Observations

magnetic field blos zero level
xMagnetic Field Blos Zero Level

45s

720s

Early HMI MagneticField Observations

magnetic field blos mean field hmi mdi wso
Magnetic Field Blos Mean FieldHMI – MDI – WSO

Early HMI MagneticField Observations

hmi blos 45 vs hmi blos vector
HMI Blos 45 vs HMI Blos Vector

HMI Blos 45 vs HMI Blos 720

Early HMI MagneticField Observations

hmi blos vector method
HMI Blos Vector Method

HMI Blos 45 vs HMI Blos 720

Early HMI MagneticField Observations

hmi vs mdi blos comparison
HMI vs MDI Blos Comparison

Early HMI MagneticField Observations

hmi vs mdi blos comparison1
HMI vs MDI Blos Comparison

Early HMI MagneticField Observations

mdi vs solis

MDI vs MtWSO

MDI vs Solis

HMI vs MDI

HMI = 1.03 SOLIS

Early HMI MagneticField Observations

ar 11066
AR 11066

Early HMI MagneticField Observations

ar 11069
AR 11069

Early HMI MagneticField Observations

hmi vector inversion and mdi fd los comparison r centeno eliot j borrero s tomczyk k hayashi y liu
HMI Vector Inversion and MDI FD LoS ComparisonR. Centeno Eliot, J. Borrero, S. Tomczyk, K. Hayashi, Y. Liu

Early HMI MagneticField Observations

frame of vector field movie from mar 29 sunspot k hayashi r centeno eliot et al
Frame of Vector Field Movie from Mar 29 SunspotK. Hayashi, R. Centeno Eliot, et al.

Early HMI MagneticField Observations

frame of vector field movie from may 22 sunspot k hayashi r centeno eliot et al
Frame of Vector Field Movie from May 22 SunspotK. Hayashi, R. Centeno Eliot, et al.

Early HMI MagneticField Observations

slide21
Additional Magnetic Field Model Products

Produced as Standard ,On-demand, or On-request

Synoptic synchronic maps and frames

Automated Identification and Tracking of AR Patches and other features – 12 minutes

PFSS Model – Various resolutions and Cadences

Open Field Foot Point Maps

NLFFF Model – AR patches, daily and on request

MHD Models

Daily low-resolution

Monthly and major events in hi-res

Surface Flow Maps

ILCT, FLCT DAVE4VM

Early HMI MagneticField Observations

cr2096 hmi los synoptic map y liu x zhao
CR2096 HMI LoS Synoptic Map – Y. Liu & X. Zhao

Early HMI MagneticField Observations

cr2096 hmi synoptic map closeup y liu x zhao
CR2096 HMI Synoptic Map Closeup – Y. Liu & X. Zhao

Early HMI MagneticField Observations

ar patch id mike turmon xudong sun

MDI

Feb 9, 2002

AR Patch IDMike Turmon & Xudong Sun

HMI

March 29, 2010

Early HMI MagneticField Observations

dave4vm result showing horizontal velocity pete schuck karin muglach xudong sun
DAVE4VM Result Showing Horizontal Velocity Pete Schuck, Karin Muglach, Xudong Sun

Black - vertical magnetic field, Red - horizontal magnetic field,

Blue, Horizontal plasma velocities.

Early HMI MagneticField Observations

slide26

Preliminary HMI ResultsNLFFF Model Result, 2010.04.08T. Wiegelmann & X. Sun Disambiguated Vector Field March 29, 2010 K.D. Leka, G. Barnes, X. Sun

Disambiguated Bx

Early HMI MagneticField Observations

slide28
HMI Space Weather and Quick-Look Browsing Products II

Synoptic Maps

Synchronic Frame - radial field estimate - 96-minute, reduced resolution

Evolved Carrington/Synchronic map - 6 hour

Far side active region map - daily

Movie of global sun activity - 54-day, updated daily

Full-disk Velocity – averaged snapshot every 12 minutes

Full-disk Intensity - 12 minute average

Full-disk Line Depth - 12 minute average

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.

Early HMI MagneticField Observations

slide29
HMI Space Weather and Quick-Look Browsing Products

HMI space weather and browse products can be computed in near real time from quick look 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

Proposed Space Weather Product LIST – Comments welcome! This list is preliminary and is not a commitment. Each product must have a prospective user.

Full Disk

Line-of-sight magnetograms (Blos) - 90-sec; 1K*1K resolution

Vector magnetogram, inverted & disambiguated - 12 hour

Movie of Blos - 12-day history, frames updated each 90 seconds

Active Region Patches (ARPs)

Identification of active region patches - 12 minute (hourly?)

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

Early HMI MagneticField Observations

slide30
Magnetic Field Modules

Time Average_IQUV

Stokes Inversion

Field Disambiguation

Bx By Bz Coordinate Transform

Br Bth Bph Transform

Btot Inc Az Transform

VectorB_Remap/Interpolate

VectorB Spatial Average

VectorB Temporal Average

Carrington Synoptic Chart

Synchronic Map & Frame

Polar Field Extrapolation

PFSS Model & Magnetic Harmonic Coefficients

Inferred Horizontal Flows

Non Linear Force Free Field

MHD Model Active Regions

MHD Model Global Corona

Solar Wind Model

Model Heliospheric Conditions

Space Weather Products

HMI_Mean Field

Associated HMI Pipeline Modules

AR Patch ID & Tracking

Feature Recognition

Spatial Averaging

Early HMI MagneticField Observations

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