25 September 2007 eSDO and the VO, ADASS 2007 Elizabeth Auden

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 Orbit: 36000 km circular, 28.5 Geo Sync. Inclined Data rate: > 1.2 TB / day Launch: August 2008

25 September 2007 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 Partners: MSSL, Birmingham, Sheffield, RAL

25 September 2007 eSDO and the VO, ADAss 2007 Elizabeth Auden

Algorithms

• 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

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

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 CenterTRACE image coronal loops viewed in Aladin

25 September 2007 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• Calculation of target mode l, m, n (degree, azimuthal order, and order)

eSDO CEA applications found by AstroGrid task launcher

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 MPI-CH 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 e-Science 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

1STAP – Simple Time Access Protocol web services; generic API for searching by start and end times.

25 September 2007 eSDO and the VO, ADAss 2007 Elizabeth Auden

Visualization tool

• staptv-1.0-beta.war: Tomcat .war file• Streamingtool_1.0_beta_src.zip:

Eclipse java project source code

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

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!