1. Solar-B Global DataGrid Update for AstroGrid SAG 10 RALMSSL Tim Folkes Elizabeth Auden Jens Jensen Paul Lamb Matthew WildMatthew Whillock Len Culhane Elizabeth Auden 28 September 2006

2. Overview The Solar-B mission was launched on Friday 22 September 2006, from the Uchinoura Space Center in Japan. Mission duration: 3 years nominal, +10 years lifetime expected Scientists and software engineers at MSSL and RAL have designed the Solar-B global data grid to provide mission data to solar research communities in the UK and abroad. Solar-B science objectives Data transfer and processing Data storage User access to data Data security

3. Solar-B Mission Overview EIS - MSSL/NRL EUV Imaging Spectrometer SOT - ISAS/NAOJ Solar Optical Telescope XRT - SAO/ISAS X-ray Telescope FPP - Lockheed/NAOJ Focal Plane Package

4. Solar-B Science Key Science Questions 1.How is the solar corona heated? Are active regions heated in a different way to the quiet Sun? 2.What causes solar flares and coronal mass ejections? 3.How is energy transferred in the quiet Sun? How are solar magnetic fields affected? Solar events like flares and coronal mass ejections can have a profound affect on the Earth’s magnetosphere. A geomagnetic storm in 1989 triggered a blackout of the Hydro Quebec power system.

5. Transfer of Solar-B Data to ADS Solar-B data transferred via GridFTP from ISAS and MSSL to an NFS mounted disk at ADS. Data Migration Facility Manages NFS area Produced by SGI User transparent file migration Licence for 500Tbytes storage Backend: STK SL8500 –10,000 tape slots –STK 9940B drives (200GB 30MB/sec) –STK T10000 drives (500GB 120MB/sec) ADS RAL ISAS Japan MSSL processing Satellite data LL data HL data HL LL

6. ADS Data Storage DMF STK SL8500 robot The DMF monitors the Solar-B NFS area and removes disk copies of data to keep free space at required level. Small files have primary copy on disk. (Speeds up read/writes.) ADS Interface NFS Tape Firesafe Larger files have primary copy on tape. All files have secondary copy on tape. These are periodically moved to the firesafe. Hardware Based on Altix 350 Numaflex architecture 40 Tbytes raid disk Network Local server: 1Gbit network Part of 10Gbit back-bone Coming soon: SJ5 10Gbit link

7. User Access to Solar-B Data Instrument Data SOT: Solar Optical Telescope Magnetic field images Optical images Magnetic field velocity measurements XRT: X-Ray Telescope X-ray coronal images EIS: EUV Imaging Spectrometer Coronal line strengths and profiles Plasma diagnostics DMF Users access data as URLs through the AstroGrid workbench, STAP web services, browsers, or wget. Files via URLs and DMF system at RAL’s UKSSDC

8. Accessing Solar-B data through AstroGrid MySQL AstroGrid DSA FITS keywords, Data URLs DSA: DataSet Access ADQL to SQL AstroGrid STAP service INPUT: ADQL queries STAP: Simple Time Access Protocol OUTPUT: FITS keywords, URLs INPUT: start / stop dates OUTPUT: URLs AstroGrid workbench AstroGrid HelioScope, STAP enabled tools ADS Web-visible file system AstroGRID PLASTIC tools, Solar-B website, wget, browser INPUT: URLs OUTPUT: Solar-B files

9. AstroGrid User Components HelioScope: solar data results from STAP services. AstroGrid workbench: STAP service access through HelioScope, DSA access through the Task Launcher. Task Launcher: locate DSAs, submit ADQL queries Workbench: http://www2.astrogrid.org/desktop/index STAP: Simple Time Access Protocol http://personalpages.manchester.ac.uk/staff/s.dalla/astrogrid/strap.html DSA: DataSet Access http://www.astrogrid.org/maven/docs/HEAD/pal/index.html ADQL: Astronomical Data Query Language http://www.ivoa.net/Documents/latest/ADQL.html

10. Conclusions Solar-B launched on 22 September 2006 Data transferred via GridFTP to ADS at RAL ADS facility uses DMF to manage files on disk and tape Data searchable through AstroGrid DSA and STAP web service Solar community accesses data through AstroGrid workbench, HelioScope or a web browser LINKS: AstroGrid: http://www.astrogrid.orghttp://www.astrogrid.org Solar-B countdown: http://www.mssl.ucl.ac.uk/www_solar/