virtual observatory in the geospace environment studies
DESCRIPTION
CODATA-20 Beijing, Oct 23-25, 2006. Virtual Observatory in the Geospace Environment Studies. Tatsuki Ogino and STEL Members Solar-Terrestrial Environment Laboratory, Nagoya University and Group for Creative Research Project. Regional Coupling in Sun-Earth System. - PowerPoint PPT PresentationTRANSCRIPT
Virtual Observatory in the Geospace Environment Studies
Tatsuki Ogino and STEL MembersSolar-Terrestrial Environment Laboratory,
Nagoya Universityand
Group for Creative Research Project
CODATA-20 Beijing, Oct 23-25, 2006
Satell ite anomalies relatedto Space Weather are on therise due to the increased useof composite materialsinstead of metal, and smaller,faster chip designs. The threeprinciple anomaly types are:surface charging, internalcharging, and Single EventEffects (SEE).
Satell ite anomalies relatedto Space Weather are on therise due to the increased useof composite materialsinstead of metal, and smaller,faster chip designs. The threeprinciple anomaly types are:surface charging, internalcharging, and Single EventEffects (SEE).
The Sun’s magnetic field is propagated farbeyond our planetary system by the solar wind.The interact ion between this interplanetarymagnetic field (IMF) and Earth’s ownmagnetic field is a significant component ofSpace Weather.
The Sun’s magnetic field is propagated farbeyond our planetary system by the solar wind.The interact ion between this interplanetarymagnetic field (IMF) and Earth’s ownmagnetic field is a significant component ofSpace Weather.
The Ionosphere is a layer of the Earth’supper atmosphere that contains free electronsand ions produced by solar UV radiation.Disruptions of the ionosphere cansignificantly affect radar, and radiocommunication.
The Ionosphere is a layer of the Earth’supper atmosphere that contains free electronsand ions produced by solar UV radiation.Disruptions of the ionosphere cansignificantly affect radar, and radiocommunication.
The Sun powers both the space weather and theterrestrial weather machines. Solar events, i.e.,explosions of charged particles and the dynamicsof magnetic and electric fields, cause hugechanges in the near-Earth space environment.Satelli tes and communication signals musttraverse this electric space.
The Sun powers both the space weather and theterrestrial weather machines. Solar events, i.e.,explosions of charged particles and the dynamicsof magnetic and electric fields, cause hugechanges in the near-Earth space environment.Satelli tes and communication signals musttraverse this electric space.
Solar-Terrestrial Environment
FlaresFlares
Solar WindSolar Wind
MagnetosphereMagnetosphere
Y. K ami de
Interplaneta ry Magnetic Field
X-raysX-rays
IonosphereIonosphere
Coronal Mass EjectionsCoronal Mass Ejections
PolarGeosynchronousGeosynchronous
Regional Coupling in Sun-Earth System
1. From solar surface to interplanetary space
Solar flare to CME (Coronal Mass Ejection)
2. Solar wind-magnetosphere-ionosphere interactionCoupling between the CME and magnetosphere
3. Interstellar wind-heliosphere interaction Long term variation and solar cycle
SunSolar Wind
IMFMagnetosphere Ionosphere
AtmosphereThermosphere
Solar Physics
Solar wind-magnetosphere interaction
M-I Coupling
Thermosphere Model
GSFC/NASANRL, UCLA, MichiganNagoya, NICT, Kyusyu
(KRM, AMIE)
(NCAR et al)
Solar wind-magnetosphere-ionosphere-thermosphere interaction
Physical Model of Regional Coupling
Flare to CME
CME to Earth
Unified Model of Outer and Inner Magnetospheres and Ionosphere
40 Re
16 Re
10 Re
1.0 Re
1.5 Re
Outer Magnetosphere
Inner Magnetosphere
Ionosphere
-160 Re
Multi-Scale in Space-TimeInhomogeneous Grid
Earth
Cross-Scale Coupling in Sun-Earth System
(macro-, meso-, micro-scale coupling)1.Structure of magnetic reconnection (separation of
Ion-electron inertia scales) and particle acceleration
2. Dynamics of the high energy ring current particles
3. Variation of high energy particles in radiation belts
4. Particle acceleration/precipitation in aurora region
Magnetosphere: Cross scale coupling
磁気リコネクションセパラトリックスの構造
電子慣性スケールは重要?
電子電流ionyJ
electronyJ
流出
拡散領域
流入
電子慣性
イオン慣性 電子電流
イオン電流
Importance of magnetic reconnection for energy budgetCoupling between ion and electron inertia scales?
Structure of the magnetosphere and magnetic reconnection in the tail
Schematic diagram of the cross scale coupling between ions and electrons in the region of tail reconnection
Electron inertia scale
Ion inertia scale
Central region of reconnection
Geospace Study
GeospaceSun-earth system
CMEcoronal hale Solar wind-magnetosphere-
Ionosphere-thermosphere coupling
High energy particles of radiation beltsSolar wind-magnetosphereinteraction
Aurora
solar wind
Space Weather Map
Courtesy of NASA
electron
ionRing current
Inner magnetosphereouter belt
inner belt
Objectives of Virtual Laboratory
1.Real time accumulation of observation data and their mutual utilization
2.Produce new simulation/modeling data by physical model using observation data as input
3.Produce animation and 3D visualization (VRML, VR) data
4.Comparison and assimilation of simulation/modeling data with observations
5.Sharing of VR function through high speed network
・ Parallelization of 3D MHD code
3D array of (Nx,Ny,Nz)=(N,N,N)3D decomposition, (Px,Py,Pz)Number of cpu, P=Px*Py*Pz
Supercomputing
・ From vector-parallel machine to scalar-parallel machine・ For high performance computation by scalar-parallel machine Increase of the number of cpu in parallel computation Decrease of the amount of communication Increase of hit rate of cache
3. New Development of 3D MHD Code by Using MPI
Set up of environment
Initial condition
Read of previous data
Boundary condition
Data transfer (send+recv)
Computation of First Step
Data transfer (send+recv)
Computation of Second Step
Inner boundary condition
Upstream condition
Write of sampling data
End of simulation
Efficiency of Parallel Computation by Domain Decomposition
Com
putation Tim
e
(Ts
)
Number of Processors ( P)
1
101
102
103
104
10410310210111
101
102
103
104
Com
munication T
ime (T
c)
1-dimension
2-dimension
3-dimension
PTs
1
)1(1 PTc
)1(2 2
1
2 PTc
)1(3 3
1
3 PTc
To realize high performance computation by scalar-parallel supercomputer ・ Longer inner do loop in vector-parallel machine, This brings to decrease of the hit rate of cache in scalar- parallel machine ・ Decrease of amount of communication Adoption of 2D and 3D domain decompositions
・ Increase of the hit rate of cache Put related variables in nearer addresses
Four Key Functions of Supercomputer
Speed cpu 610 Gflops 12.48 Tflops
Main Memory Disc + Graphics 1TB 11.5 TB 17TB 50 TB Animation, 3D Visualization
Network SuperSINET (10 Gbps)
VPP5000/64 (vector-parallel)HPC2500/1536 (scalar-parallel)
Supercomputer system of the Information Technology Center, Nagoya UniversityFujitsu PRIMEPOWER HPC2500/1536
21 Tflops11.5 TB
1975 1980 1985 1990 1995 2000103
104
105
106
107
108
109
1010
Year
To
tal G
rid N
umb
er,
Ng
2D and 3D MHD Simulation
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△
△
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▲ ▲ ▲
▲
▲
▲
▲
▲
△
3D MHD ○ ●
2D MHD△ ▲
ADENART×○○
○
○○
26*26*18
62*32*32
94*53*53
162*42*52
182*122*62
212*142*72
302*102*102
642*162*322
402*202*202
802*202*402
○
○△
18*18*12
××
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482*162*162
502*202*102
322*82*162
322*82*82
160*60*70
10 times/ 5yearsor
4 times/ 3 years
152*102*52182*62*62
1502*1002*11202240*560*1120
1002*1002*1120
1340*448*8961002*502*1120
802*202*672
2005
○
○
1024*1024*1024
2048*1024*1024
o 2048**3
Expansion of 2D and 3D MHD Simulations
To carry out Geospace Simulation
Use one of the largest supercomputers in the world
Improve numerical methods
Use efficient parallel computation methods
Understand well the simulation results by graphics
Virtual Reality (VR) System Using 3 Screens
Screen
Projector x 8
Gigabit Ethernet
Graphics computer (PC) x 8
Parallel control computer (PC)
Conceptual Diagram of PLAGS VR SystemConceptual Diagram of PLAGS VR System
Virtual Reality (VR) System
1. Use VRML, AVS, OpenGL and other softwares VRML: Everyone can use freely and everywhere International Standard 2. CAVE System ~2 M$ 3. PC VR System (with large screen) ~20 K$
4. PC VR System (with usual screen) 2~6 K$
polarizing grasses, unaided VR, high speed Internet
Plasmoid ejection in magnetotail by VRML
magneticreconnection
plasmoid
earth
CAWSES Space Weather Database in Japan
Scientific Committee on Solar-Terrestrial Physics (SCOSTEP)
CAWSES program (2004- 2008) The Climate And Weather of the Sun-Earth System Program
STEP program (1990- 1997) S-RAMP program (1998- 2002)
The CAWSES Space Weather Database in Japan has been begun in order to promote the international collaborative CAWSES research program.
Computer / Network
Collaborative Research Program by Using Supercomputer of the Information Technology Center, Nagoya University
From vector-parallel machine, Fujistu VPP5000/64 to scalar-parallel machine, Fujitsu PRIMEPOWER HPC2500/1536
We have developed new programs which efficiently work in the scalar-parallel machine.
GIGAbit Network and TV Conference System
On-line lecture program using a video teleconferencing system New TV conference system using TCP/IP of Internet
From Gigabit Network (2000-2003) to JGN2 of NICT (2004-2008)
"Common Usage of the Information of Geospace Environment Using High Speed Network" for 2004-2008
Near real-time exchange and common usage of information and data on the Geospace (Solar-Terrestrial) Environment
Simulation, animation movie, 3-dimensional visualization, virtual reality (VR), 4-dimensional movie
NICT Koganei
Nagoya U
Kyoto U Ehime U, IT Center
Kyusyu U
Yamanashi
JGNⅡ
APAN Abilene
SINET
Kanto-2
100Mbps
10Gbps
1Gbps
100Mbps1Gbps
1Gbps
USA, China, Korea
SuperSINET and JGN-2 (1-10 Gbps)
Virtual ObservatoryTo estimate physical quantities in the huge space by using cross scale coupling model and exchange the information via high speed network
A synthetic and integrated research project on “Space Weather Forecast”
One of the e-Science Projects (2006~ )“Geospace Virtual Laboratory/Virtual Organization” Solar-Terrestrial Environment Laboratory and Information Technology Center of Nagoya University (+ JAXA/ISAS, Ehime U and NICT)
Use NAREGI-Beta version grid middleware(1) Data grid Laboratory data, S-RAMP data, CAWSES data(2) Graphics grid and virtual reality grid(3) Computing grid scheduler for supercomputers heterogeneous computer link programs minimizing communication amount
Geospace Research Center
Solar-Terrestrial Environment Laboratory
Division 1
Atmospheric Environment
Division 2
Ionospheric and Magnetosphric Environment
Division 3
Heliospheric Environment
Division 4
Integrated Studies
Joint Research Project
theory
simulation data archivesdata analysis
integration
observations
Domestic research institutions
Foreign research institutions
Promotion, Cooperation andmanagement
Virtual Laboratory (1) Provide and share the data of observations and modeling/simulations
(2) Use mutually huge data of graphics, animation and 3-dimensional visualization through high speed network (Super-SINET, JGN-2: 10Gbps to 40Gbps? in 2008)
(3) Share the 3D visualization data (VRML, VR) Establish a system by which people can watch 3D figures of geospace under their own remote control
Real Time, Animation, Virtual Reality (VR), Advanced IT