Adaptive Mesh Particle Simulator (AMPS)

Valeriy Tenishev, Dmitriy Borovikov, Nicolas Fougere, Yuni Lee, Michael R. Combi, Tamas Gombosi, Martin Rubin

New component of SWMF

SWMF Control & Infrastructure

EruptionGenerator

Solar Corona

InnerHeliosphere

GlobalMagnetosphere

Polar Wind

InnerMagnetosphere

IonosphericElectrodynamics

Thermosphere& Ionosphere

Energetic

Particles

Radiation

Belts

3D OuterHeliosphere

Couplers

Flare/CMEObservations

UpstreamMonitors

RadarsMagnetometers

In-situ

F10.7 FluxGravity Waves

Magneto-grams,rotation

tomography

Particle in Cell

Particle

Tracker

BATSRUS

IPIC3D

AMPS

BATSRUSBATSRUS

BATSRUS

AMPS

DSMC schemeo Realistic modeling of collisions in rarefied gaso Photochemical reactions for production of the minor species

Two phase simulation: gas and dust in a single model run

Adaptive mesh with cut-cellso Irregular nucleus shape for modeling the comao Realistic shape model of Rosetta spacecraft for modeling of its

gas environmento Variable mesh resolution to capture important features of the

dusty gas flow

Integration with SPICE and SWMF

Method and Applications

Non-equilibrium dusty gas flow Comets, planetary satellites and exospheres▪ Common characteristic: the collision coupling

cannot maintain the state of the equilibrium

Kinetic description Boltzmann equation The evolution of the system is modeled by

tracing the model particles▪ Translational motion is separated from the

particles collisions and chemistry

Method

Translational particle motion

Particle collisions and chemistry HS, VHS, VSS molecular models TC, NTC, MF collision models LB, QLB models of the internal degrees of

freedom Photo-ionization and photo-dissociation

Method

Ion/neutral gas and dust Modeled simultaneously

Optimizations Local time step and particle weight Individual particle weight correction Domain decomposition Load balancing▪ Static: volume, cell number ▪ Dynamic: particle number, execution time

Mesh

AMR with cut-cells

Execution

Stand-along and a component of SWMF

SettingsUser-defined

parameter file

User-defined model routines

Generic AMPS’core

Coupling with SWMF

New coupling scheme between AMPS and BATSRUS

One-way coupling in production runs

Example

Na in Moon’s exosphere

SPICE routines are integrated into AMPS. SPICE is used for calculating Moon’s orbital parameters, location of the spacecraft and pointing direction of the instrument.

Sodium exospheric brightness. Comparison with observations obtained by UV instrument onboard Kaguya. Calculation of the column integrals are incorporated into AMPS.

Example

New development: O2 and O2+ in Europa’s exosphere

O2 number density. Produced via sputtering by the magnetospheric ions. The ions flux is derived form BATSRUS restart files

O2+ number density. Produced ionization of O2. Newly created ions are traced in the fields exported from BATSRUS restart files