Presentation given at COSPAR 2010 meeting

1. The new code for ESA meteoroid model.
Alexey Mints1 Valery Dikarev1 Gerhard Drolshagen2
1 University of Bielefeld, Germany
2 European Space Agency, Noordwijk, The Netherlands
18.07.2010

2. Problem
Outline
1 Problem
2 Code
3 GUI
A. Mints, 18.07.2010 The new code for ESA meteoroid model. 2 / 22

3. Problem
Requirements
Input: Target trajectory and geometry, output content
specification;
Output: Estimated dust flux, number density and average
velocity. Dust distributions in mass, incidence
direction and velocity.
GUI: A tool to set input parameters and view output.
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4. Problem
Orbital elements
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5. Problem
Model (as of now)
5 populations, for each:
• Rectangular 3D grid in orbital space. Dimensions:
pericenter distance (0.05-6 a.u., 50 log-scale bins),
eccentricity (0-1, 100 bins) and inclination (0-180, 180
bins);
• Mass spectra (200 log-scale bins from 10−18 to 105
grams), independent of orbital elements;
Current model file size ∼28 Mbytes.
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6. Problem
Grids
Figure: Possible grids: regular (left), irregular (right)
Old IMEM New IMEM
Regular (orthogonal) grid in Regular (spherical) grid in
orbital elements. incidence velocity.
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7. Problem
Old and new approaches
Old IMEM New IMEM
Jacobian diverges, tricks are Symmetries cannot be used;
needed; No Jacobian needed;
Incidence direction has to be Incidence direction emerges
calculated: have to run over naturally from the grid;
the whole model range;
Reduced calculations for
Symmetries can be used; sensitivity;
Various scans can be easily
implemented;
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8. Problem
Thresholds
C1 < mα V β < C2
• α = 1; β = 0 — mass threshold;
• α = 1; β = 1 — momentum threshold;
• α = 1; β = 2 — kinetic energy threshold;
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9. Problem
Calculation grid
∗ grid ∗
Vdust = Vdust + Vtarget
Geometrical sensitivity can be calculated from ϕ;
grid
Knowing Vdust we can calculate mass densities as
C2 /V β
C1 /V β
mα dm;
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10. Code
Outline
1 Problem
2 Code
3 GUI
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11. Code
Application layout
Java Fortran
Interface Model Data module
Results Output
data datafiles
I/O routines Core
User Input
Task data
data datafiles
Global
settings
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12. Code
Application composition
• Calculation engine — FORTRAN-95 program (∼4000
lines);
• GUI — Java graphical interface (∼11000 lines) developed
with NetBeans ;
• User documentation;
• Model file;
• Sample task and trajectory files;
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13. Code
Engine input files
• Task file — over 30 parameters, defining task properties
and output content and format;
• Trajectory file — contains orbital parameters or
point-by-point trajectory;
• Sensitivity file — optional file containing sensitivity
function;
• Model file — dust orbital distribution model (binary file);
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14. Code
Task file
D e s c r i p t i o n=
P o p u l a t i o n s=∗
M e t e o r o i d m o d e l=
T r a j e c t o r y f i l e =x . t r j
S e n s i t i v i t y f i l e =t . t s k s e n s
P l o t s e t t i n g s=t . t s k p l o t
R e s u l t=t . t s k r e s
S e n s i t i v i t y p r e s e t =0
P o p u l a t i o n s s t y l e =1
P o i n t s s t y l e =1
C o o r d i n a t e s s t y l e =1
E a r t h c o o r d i n a t e s =0
Scan mode=0
P h y s u n i t s =0
F l u x =1
N u m b e r d e n s i t y=0
A v e r a g e v e l o c i t y =1
T h r e s h o l d s=m, 1 . 0 0 e −18, 1 . 0 0 e+02
I n c i d e n c e r a n g e =0.00:180.000000
V e l o c i t y r a n g e =0.000000:100000.000000
T a r g e t t y p e =0
T a r g e t o r i e n t a t i o n =0
O r b i t k i n d =1
O r b i t s o l a r =0
O r b i t e c l i p t i c a l =0
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15. Code
Engine output
#IMEM2 o u t p u t f i l e
#C r e a t e d =20/ 5/2010 2 0 : 2 7 : 3 5 . 1 6 0
#P h y s u n i t s=F
#Scan mode=0
#S c a n r e s o l u t i o n= 20
#P o p u l a t i o n s s t y l e =1
#P o i n t s s t y l e =1
#T h r e s h o l d s i n c o l u m n s=F
#C o o r d i n a t e s s t y l e =1
#E a r t h c o o r d i n a t e s=F
#N u m b e r d e n s i t y=F
#F l u x=T
#A v e r a g e v e l o c i t y=T
#T a r g e t t y p e =0
#T a r g e t o r i e n t a t i o n =0
#S e n s i t i v i t y p r e s e t =0
#T r a j e c t o r y t y p e =0
#T r a j e c t o r y t y p e= 0.: 180.
#M i s s i o n d u r a t i o n= 3.0
#M i s s i o n l a u n c h= 0.0
#P o i n t Thr | Time | asteroids collisions |...
# | | Flux | AvgV |...
# 1 | 2 | 3 | 4 | 5 |...
1 1 0 . 0 0 0 0 0 0 0 0 E+00 0 . 0 0 0 0 0 0 0 E+000 0 . 0 0 0 0 0 0 0 E+000 . . .
2 1 0 . 1 0 0 0 0 0 0 0 E+01 0 . 0 0 0 0 0 0 0 E+000 0 . 0 0 0 0 0 0 0 E+000 . . .
3 1 0 . 2 0 0 0 0 0 0 0 E+01 0 . 0 0 0 0 0 0 0 E+000 0 . 0 0 0 0 0 0 0 E+000 . . .
4 1 0 . 3 0 0 0 0 0 0 0 E+01 0 . 0 0 0 0 0 0 0 E+000 0 . 0 0 0 0 0 0 0 E+000 . . .
. A. .Mints, 18.07.2010
.. The new code for ESA meteoroid model. 15 / 22

16. GUI
Outline
1 Problem
2 Code
3 GUI
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17. GUI
Main window
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18. GUI
Output properties window
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19. GUI
Progress window
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20. GUI
Plots
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21. GUI
Maps
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22. GUI
Future plans
• Final release – September 2010;
• OpenMP and MPI extensions;
• Web-interface;
• More Engine features (for example, meteor flux for a
given location on Earth);
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