The HMI AIA Joint Science Operations (JSOC-SDP) Science

The HMI  AIA Joint Science Operations (JSOC-SDP) Science


HMI AIA Joint Science Operations (JSOC-SDP)
Science Data Processing for the Solar Dynamics Observatory

Helioseismic & Magnetic Imager on the Solar Dynamics Observatory
The HMI Team Stanford University, LMSAL, HAO, ++

HMI Recent Progress & Current HMI Activities

HMI Major Science Objectives
The primary goal of the Helioseismic and Magnetic Imager (HMI) investigation is to
study the origin of solar variability and to characterize and understand the Suns interior
and the various components of magnetic activity. The HMI investigation is based on
measurements obtained with the HMI instrument as part of the Solar Dynamics
Observatory (SDO) mission. HMI makes measurements of the motion of the solar
photosphere to study solar oscillations and measurements of the polarization in a spectral
line to study all three components of the photospheric magnetic field. HMI produces data
to determine the interior sources and mechanisms of solar variability and how the
physical processes inside the Sun are related to surface magnetic field and activity. It also
produces data to enable estimates of the coronal magnetic field for studies of variability
in the extended solar atmosphere. HMI observations will enable establishing the
relationships between the internal dynamics and magnetic activity in order to understand
solar variability and its effects, leading to reliable predictive capability, one of the key
elements of the Living With a Star (LWS) program.
The broad goals described above will be addressed in a coordinated investigation in a
number of parallel studies. These segments of the HMI investigation are to observe and
understand these interlinked processes:

The JSOC-SDP Team Stanford University

Convection-zone dynamics and the solar dynamo;
Origin and evolution of sunspots, active regions and complexes of activity;
Sources and drivers of solar activity and disturbances;
Links between the internal processes and dynamics of the corona & heliosphere;
Precursors of solar disturbances for space-weather forecasts.

These goals address long-standing problems that can be studied by a number of
immediate tasks. The approaches to study these processes reflect our current level of
understanding and will obviously evolve in the course of the investigation.

(as of May 2010)
SDO with HMI was launched on Feb 11, 2010.
The HMI aperture door was opened on March 24.

Michelson Interferometer

ISS Beam-splitter

Alignment Mechanism

Limb Sensor Assembly

Filter Oven Assembly

ISS Pre-Amp Electronics

Lyot Filter Assembly
Oven Controller E-Box

Camera Electronics Box

Focus Mechanism

Telescope Assembly

ISS Mirror Assembly

Primary Lens Assembly

Hollow Core Motors

Front Window Assembly

Secondary Lens Assembly

Front Door Assembly


Optical Characteristics:
Effective Focal Length: 495 cm
Telescope Clear Aperture: 14 cm

Mechanical Characteristics:
Box: 0.84 0.55 0.16 m
Over All: 1.19 0.83 0.30 m
Mass: 44.0 kg
First Mode: 73 Hz


We expect stable data products to be regularly available starting mid
June 2010.
HMI level-1 science data will be available within a day or so after
Regular processing of higher level products will begin during the
next few months.

Access to HMI data is available via the HMI/AIA JSOC (see right half
of this poster) and VSO.

HMI Implementation
The HMI instrument design and observing strategy are based on the highly
successful MDI instrument, with several important improvements. HMI observes
the full solar disk in the Fe I absorption line at 6173 with a resolution of 1 arcsecond. HMI consists of a refracting telescope, a polarization selector, an image
stabilization system, a narrow band tunable filter and two 4096 pixel CCD
cameras with mechanical shutters and control electronics. The continuous data
rate is 55Mbits/s.
The polarization selector, a set of rotating waveplates, enables measurement of
Stokes I, Q, U and V with high polarimetric efficiency. The tunable filter, a Lyot
filter with one tunable element and two tunable Michelson interferometers, has a
tuning range of 600 m and a FWHM filter profile of 76 m.
Images are made in a sequence of tuning and polarizations at a 4-second cadence
for each camera. One camera is dedicated to a 45s Doppler and line-of-sight field
sequence while the other to a 90s vector field sequence. All of the images are
downlinked for processing at the HMI/AIA Joint Science Operations Center at
Stanford University.

The data volume is large, more than a terabyte per day. Thus we encourage users to export
only the data they actually need for immediate analysis. We are committed to provide tools
to allow subsetting of the data and of providing multiple access tools appropriate for
different data volumes for different users.



Dopplergrams, Line-ofSight magnetograms,
Continuum Proxy Intensity,
6173A line width, line depth
respectively, observed at
45-second cadence.

Final products available
after mid June will not have
the _test suffix to the
project name. Units are m/
s, gauss, DN/s, mA, and
DN/s resp.

Stokes I,Q,U,V at 12 minute 24 quantities are saved for
each time step. IQUV for
each of 6 filter tuning

Tracked Tiles
Of Dopplergrams

The solid lines show the HMI filter transmission profiles at 76 m spacing. The
black dashed line is the profile used for the continuum filtergram. The dotted
line shows the Fe I line profile.
Contributors to the HMI development up through launch include:
HMI Team
HEPL, Stanford
**Phil Scherrer
*John. Beck
*Richard. Bogart
*Rock Bush
*Tom Duvall, Jr.
*J.Todd Hoeksema
*Yang Liu
*Jesper Schou
*XuePu. Zhao
Jim Aloise
Art Amezcua
Kelly Beck
Millie Chethik
Keh-Cheng Chu
Carl Cimilluca
Sebastien Couvidat
Nancy Christensen
Romeo Durscher
Thomas Hartlep
Keiji Hayashi
Tim Huynh
Stathis Ilonidis
Kevin Kempter
Irina Kitiashvili
Rasmus Larsen
Tim Larson
Leyan Lo
Rakesh Nigam
Bala Poduval
Brian Roberts
Kim Ross
Deborah Scherrer
Jeneen Sommers
Jennifer Spencer
Margie Stehle
Xudong Sun
Hao Thai
Karen Tian
Jeff Wade
Richard Wachter

Junwei Zhao
HEPL Staff
*Alan. Title
*Tom Berger
*Karel Schrijver
Dave Akin
Brett Allard
Ron Baraze
M. Baziuk
E. Bogle
Bob Caravalho
Brock Carpenter
C Cheung
Roger Chevalier
K. Chulick
Tom Cruz
Jerry Drake
Dexter Duncan
Jay Dusenbury
Janet Embrich
Chris Edwards
Cliff Evans
Peter Feher
Barbara Fischer
Chuck Fischer
Sam Freeland
Frank Friedlander
Glen Gradwohl
Hank Hacook
Gary Heyman
Bob Honeycutt
Elizabeth Hui
Bruce Imai
Jerry Janecka
Romona Jimenez
Dwana Kacensky
Pete Kacensky
Claude Kam
Noah Katz
Karen Kao
Dave Kirkpatrick
Gary Kushner
Michael Levay
Russ Lindgren
Gary Linford
Andrea Lynch
Dnyanesh Mathur

Ed McFeaters
John Miles
Keith Mitchell
Sarah Mitchell
Ruth Mix
Margaret Morgan
Rose Navarro
Tom Nichols
Tracey Niles
Jackie Pokorny
Roger Rehse
Rick Rairden
J-P Riley
Lomita Rubio
David Schiff
Isella Scott
Ralph Sequin
Cherl Seeley
Lawrence Shing
Araya Silpikul
Larry Springer
Dick Shine
Bob Stern
R. Timmons
Louie Tavarez
Edgar Thomas
Darrell Torgerson
Angel Vargas
Shan Varaitch
Dale Wolf
Jake Wolfson
Carl Yanari
Ross Yamamoto
Kent Zickuhr
*Steve Tomczyk
Bruce Lites
Jonathan Graham
Anthony Darnell
Gregory L. Card
Aimee Norton
Juan Borrero
Rebecca C. Elliott
David Elmore
Bruce Lites
Hector SocasNavarro
Arturo Lopez Ariste

Matthias Rempel
Michael Turman
*Juri Toomre
Deborah Haber
Bradley Hindman
Nicholas Fetherstone
Regner Trampedach
Swati Routh
Benjamin Brown
Gwen Dickenson0
*Nagi Mansour
*Alan Wray
*Phil Goode
Vasyl Yurchyshyn
*Doug.C. Braun
*Charlie.A. Lindsey
Graham Barnes
Aaron Birch
Ashley Crouch
KD Leka
*Tom Metcalf
Orion Poplawski
Martin Woodard
*Frank Hill
*Rachel Howe
Igor Suarez-Sola
Walter Allen
Olga Burtseva
Irene GonzalezHernandez
Rudi Komm
Sushanta Tripathy
Kiran Jain
Shakur Kholikov
Predictive Science
*Jon. Linker

Zoran Mickic
Pete Riley
Janvier Wijaya
Michael Choy
Timofey Titov

*Sami Solanki,
Laurent Gizon
Raymond Burston
Yacine Saidi

*Sylvain Korzennik
Alisdair Davey

*Len Culhane
Elizabeth Auden

*Roger Ulrich

*Takashi Sekii
Kaori Nagashima

U. of Hawaii
*Jeff. R. Kuhn
Marcelo Emilio
Isabelle Scholl
*Judit Pap
*Ed J. Rhodes, Jr.
Anthony Spinella
Shawn Irish
Johann Reiter
Yale University
*Sarbani Basu
Charles Baldner
Aarhus University,
Cambridge, UK
*Douglas Gough
*Bernhard Fleck
S. Paul Rajaguru
Dipankar Banerjee
Siraj Hasan

*Richard Harrison
Sheffield Univ. UK
*Mike Thompson
Univ. Tokyo, JP
*Hiromoto Shibahashi
e2v - CCDs
Gary Auker
Rob Wilson
RAL - Cameras
Nick Waltham
- Michelson
Ian Miller
John Hunter
Corporation &
Zygo Corporation
- Filters
John Cotton
H. Magnetics
- motors
Ralph Horber

Time series
To l=1000

Mode frequencies
And splitting

Ring diagrams

Local wave
frequency shifts


Wave travel times

Egression and
Ingression maps

Wave phase
shift maps

Data Product
Internal rotation (r,)

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