Accessing eSDO Solar Image Processing and
Visualisation through
AstroGrid
Elizabeth Auden
ADASS 2007
25 September 2007
Image Processing and Data Visualization
25 September 2007
eSDO and the VO, ADASS 2007
Elizabeth Auden
Topics
• SDO and eSDO
• Algorithms and the VO
• Visualization Tools and the VO
25 September 2007
eSDO and the VO, ADAss 2007
Elizabeth Auden
SDO Mission
The Solar Dynamic Observatory (SDO),
prepared for launch in August 2008, is
NASA's flagship mission of the International
Living with a Star Program.
Instruments:
1. AIA – Atmospheric Imaging Assembley
2. HMI – Helioseismic and Magnetic Imager
3. EVE – Extreme UV Variability Experiment
Duration: 5 yrs nominal
Data rate: > 1.2 TB / day
25 September 2007
Orbit: 36000 km circular, 28.5 Geo Sync. Inclined
Launch: August 2008
eSDO and the VO, ADAss 2007
Elizabeth Auden
eSDO
UK e-Science project funded by PPARC to make SDO algorithms and
data available through AstroGrid:
• Algorithms: coronal event and feature recognition, global and local
helioseismology analysis, helicity computation, coronal wave analysis
• Visualization Tools: movie and image gallery views of AIA and HMI
data
• Data Access: prototype of SDO Data Resource Management System
and Storage Unit Management System with AstroGrid Data Set Access
module for a European data cache
Duration: Oct 2004 – Oct 2007
25 September 2007
Partners:
MSSL, Birmingham, Sheffield, RAL
eSDO and the VO, ADAss 2007
Elizabeth Auden
Algorithms
What you get:
C source code, Makefiles, documentation, IDL wrappers
(procedures to call the native C code from within IDL)
Download beta code now; final releases 1 Oct. 2007
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Coronal loop detection
Coronal dimming region detection
Small event detection
NLFFF magnetic extrapolation
Helicity computation
Global helioseismology mode parameters
Local helioseismology inversion
Subsurface flow analysis
Soundspeed perturbation map generation
25 September 2007
eSDO and the VO, ADAss 2007
Elizabeth Auden
Coronal Behaviour Algorithms
AstroGrid CEA1 applications, JSOC2 pipeline at Stanford
• Feature / Event Recognition
• Coronal loop recognition
• Coronal dimming region recognition
• Small event detection
• Magnetic Field Computation
• Non-linear force-free magnetic
field extrapolation
• Helicity calculation
1CEA
– Common Execution Architecture
2JSOC
– Joint Science Operations Center
25 September 2007
TRACE image coronal loops viewed in Aladin
eSDO and the VO, ADAss 2007
Elizabeth Auden
Helioseismology Algorithms
AstroGrid CEA applications, JSOC pipeline at
Stanford
• Local Helioseismology
• Local helioseismology inversion
• Perturbation map generation
• Subsurface flow analysis
• Global Helioseismology Parameters eSDO CEA applications found by AstroGrid task launcher
• Calculation of target mode l, m, n (degree,
azimuthal order, and order)
25 September 2007
eSDO and the VO, ADAss 2007
Elizabeth Auden
MPI NLFFF on NGS
NLFFF calculations involve some nasty triple integrals; great speed gains
to be had from parallelization. The eSDO NLFFF algorithm can be run
on a single CPU (8 hours for a 643 pixel vector magnetogram) or on
parallel machines using MPI-CH2 implementation.
• 2007 time trials of eSDO NLFFF algorithm on NGS servers (using MPICH optimized for NGS) show similar performance to OpenMPI
implementation
• OpenMPI version likely to be used in SDO processing pipeline (closed
access); MPI version can be used by any UK academic with an eScience certificate.
Cheat sheet:
• MPI:
Message Passing Interface – standard used to create parallel applications
• NLFFF: Non-linear force-free field – method of extrapolating magnetic fields
• NGS:
National Grid Service – high performance computational facilities for UK researchers
25 September 2007
eSDO and the VO, ADAss 2007
Elizabeth Auden
Download Algorithms
http://www.mssl.ucl.ac.uk/twiki/bin/view/SDO/FinalDeliverables
25 September 2007
eSDO and the VO, ADAss 2007
Elizabeth Auden
eSDO Streaming Tool
• Explore AIA and HMI image data with on-the-fly animations
• Find the “Interesting bits” in a large dataset
• Zoom in and out to examine solar detail
• Animate image stream to view evolution of solar behaviour
• Server side functionality: no need to download data to local machine
• AstroGrid integration
• Search for solar data available through STAP1 services
• Save movies, FITS files, and images to MySpace
– Simple Time Access Protocol web services; generic API for searching by
start and end times.
1STAP
25 September 2007
eSDO and the VO, ADAss 2007
Elizabeth Auden
Visualization tool
What you get:
Java-based web tool (Tomcat .war file) to query VO solar
instruments, create / save movies and images on-the-fly. Data
browser (not analysis). Pan and zoom images while movie
plays.
Download beta code now; final releases 1 Oct. 2007
• staptv-1.0-beta.war: Tomcat .war file
• Streamingtool_1.0_beta_src.zip:
Eclipse java project source code
25 September 2007
eSDO and the VO, ADAss 2007
Elizabeth Auden
Streaming Tool
25 September 2007
eSDO and the VO, ADAss 2007
Elizabeth Auden
Try eSDO Software
You can try:
• Algorithms with the AstroGrid workbench “Task Launcher”
• Streaming Tool on the eSDO server
Links to software, documentation, and test data:
http://www.mssl.ucl.ac.uk/twiki/bin/view/SDO/TryOurSoftware
Stay tuned for SDO launch in early 2009!
25 September 2007
eSDO and the VO, ADAss 2007
Elizabeth Auden