Expanded Observatory support (redundancy, verification)

1
Overview of CISM Code Coupling C. Goodrich and
the CISM Coupling Team
Object Oriented Framework Magnetosphere-Ionosph
ere Coupling

• The Code Coupling Thrust is responsible for
  developing and maintaining successive versions of
  the CISM comprehensive model,
• Coupling Requirements
• Truly minimal code modification
• Efficient data transfer between codes
• Data translation (physics) and interpolation
  (grid)
• Control of independently executing codes

The CISM Comprehensive Models

• Modularized version of the LFM code with separate
  Magnetosphere Ionosphere components
• Overture-based Ionosphere module solves for PC
  potential
• Module ready for LFM alone or with TING/TIE-GCM
• Internal calculation of conductances (LFM) or
• Import conductances from TING or TIE-CGM
• Data transfer via InterComm
• Extensive documentation

The functionality of our comprehensive models
come from two sources1. Strengths of the
individual component codes2. End to end
coupling, which enables physical interaction of
the component codes
CISM 1.0 (2006) Ad hoc coupling of the MAS,
ENLIL, LFM, and TING codes Following 1.x
versions incorporate improved versions of these
codes.
Model Coupling Approach

• Ad Hoc Coupling
• Code developers use hardwired linkages of code
  pairs to prototype coupling schemes and test
  scientific validity
• Object Oriented Software Framework
• Computational framework based on Object Oriented
  Programming (OOP) using existing packages
• Intelligent Data Channels (InterComm)
• Program Control (HPCALE)
• Data Manipulation and Interpolation -Couplers
  (Overture)

L1 Coupler
B, V, ?, P
MAS
ENLIL
ITM
LFM
B, V, ?, P
Jll, np, Tp

• SP, SH,
• F

CORHEL 1.2
CMIT 1.0

• Physical Inputs for ENLIL, LFM, and ITM
• L1 Coupler converts Heliospheric results for
  Geospace use
• Accurate Ionosphere (Particle precipitation from
  LFM and Conductances from ITM

CISM 2.0 (Entering CISM Validation)
Object Oriented Software Framework
B, V, ?, P
MAS
ENLIL
ITM
LFM
B, V, ?, P

• Intelligent Data Channels
• InterComm (v1.5) is a programming environment
  (API) and runtime library that provides functions
  for
• (www.cs.umd.edu/projects/hpsl/chaos/ResearchAreas
  /ic/)
• Transferring data efficiently between programs
• Data channels defined and established at runtime
• Data broadcast mode one processor to many (or
  none)
• Nonblocking exports IC caches data until
  requested
• Controlling (v2.0) when data transfers occur
• Synchronization of execution through timestamps
  on data transfers
• Program Control
• HPCALE (1.0) is an application developed to
  deploy multiple programs coupled with InterComm
• Performs computational resource discovery and
  allocation
• Automatically launches applications on desired
  resources using user configuration files (XJD
  format)
• Web tool to help users to create XJD
  configuration files

Jll, np, Tp

• SP, SH,
• F

Object Oriented Framework CMIT 2.0
CORHEL 3.4
CMIT 2.0

• Expanded Observatory support (redundancy,
  verification)
• CME (Empirical) propagation (Cone Model) (ICME
  strength and arrival time)
• Electrodynamics model of ionosphere (TIECGM)
• Runtime specification of ITM model ( TIECGM,TING)

CMIT (2.0) has been reconfigured to use the new
version of InterComm (1.6). Component code is
now independent of the source or destination of
data transfers, which are now determined at
runtime from XJD file.
Next version of CISM (In Development)
B, V, ?, P
HPCALE, IC 1.6
RCM
LFM
SEP
B, ?, P
B, V, ?, P
MAS
ENLIL
ITM
B, V, ?, P
LFM
Jll, np, Tp

• SP, SH,
• F

IC
LTR 1.2
MIC
IC

• Consistent use of Object Oriented Framework
• Low latitude (ITM) electric field
• SEP generation and propagation to Earth

• Radiation Belt modeling (energetic ion and
  electron fluxes near Earth
• Improved description of the Inner Magnetosphere
• Ring Current and Region 2 currents

XJD File Mag LFM Ion
TIEGCM Coupler MIC Mag.Pot lt-gt Ion.Drift

• Data Manipulation and Interpolation - Couplers
• Couplers make data from one code useful to
  another by
• Interpolation between disparate grids
• knowledge of grid structures of all codes
• Conversion of data between disparate physical
  models
• knowledge of code data and conversion methods
• Overture is a set of C classes providing
• (www.llnl.gov/CASC/Overture/)
• Interpolation between (moving, static)
  overlapping grids
• Registration and archiving of grids
• Powerful syntax for data manipulation
• Seamless interaction with IC (common data
  libraries)

Future Capabilities
ITM TING,TIECGM

• Physical CME initiation (CME initiation from
  coronal active regions)
• Accurate thermodynamic model for coronal heating
  and solar wind acceleration
• SEP penetration and trapping in the magnetosphere

• Multiple ion species in the Magnetosphere
  (ionospheric outflow)
• Kinetic scale physics (MI coupling, reconnection,
  )

HPCALE and IC 1.6 read XJD file. HPCALE launches
component codes. IC establishes and initializes
data channels.