The EMMREM framework consists of four pieces:
• The interplanetary source input provides the energy spectrum,
composition and angular distributions (SEPs, ACRs and GCRs) based on simulations,
observed events and interplanetary conditions, or user-specified files.
We are developing a database (available online) of simulated and observed
events and time-series.
We have developed the Energetic Particle Radiation
Environment Module (EPREM) which traces individual nodes along magnetic
field lines, as they are carried out with the Solar Wind, and solves the
energetic particle transport equations in the Lagrangian field aligned
grid. The energetic particle solutions include both the field aligned
transport solutions and contributions from cross-field diffusion and drift.
A snapshot of this evolving node-mesh is shown in Figure 2. Along each
fieldline (a connected list of nodes), we solve for particle transport,
adiabatic focusing, adiabatic cooling, convection, pitch-angle scattering,
and stochastic acceleration.
The EMMREM specific version of the BRYNTRN code (Looping BRYNTRN) has been installed at the University of New Hampshire and is running on the UNH operating systems using the UNH Fortran compilers. The code is capable of performing near real-time simulations of SEPs that provide organ doses and dose equivalents (Figure 3), using computerized anatomical models of the shielding of radio-sensitive organs, for thinly shielded spacecraft. The code has been used for various studies involving several large historical SEP events.
To request access to the module, click here for a list of contacts.
This material is based upon work supported by the NASA/LWS under Grant No. NNX07AC14G.
Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of NASA.
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