MISSION PLAN - PDS Small Bodies Node

8
10
flare, no shielding
6
10
4
10
2
10
250 mil
36 mil
60 mil
100 mil
0
10
-2
10
-4
10
-6
10
Heavy -Ion Peak Flux (/cm 2/day)
(Omni-Directional)
GCR 25 mil
GCR 500 mil
Shielding is an aluminum sphere of given radius.
-8
10 100 mil of Al = 0.686 g/cm2
500 mil
1000 mil
-10
10
1 10 100
LET (MeV-cm 2/mg)
Figure 2.3-6b Heavy-ion Flux from a 95% Solar Flare at 1 AU and
for Adams’ 90% Worst Case GCR
2.3.3.3 Micrometeoroid
Cumulative micrometeoroid fluence levels as a function of time from Launch is shown in
Table 2.3-7. These selected times correspond approximately to each of the three
aphelions and to the end of mission. The integral fluence is provided as a function of
particle mass. The numbers correspond to 1-sigma levels of the JPL micrometeoroid
environmental model. The 1-sigma uncertainty of the model assumes log-normal
distribution, thus the 2-sigma and 3-sigma levels are 3 and 9 times of the numbers shown.
Table 2.3-7 STARDUST Mission Micrometeoroid Environment
Time: L+376.4 d L+1188.7 d L+2091.4 d L+2533.6 d
MASS (grams) FLUENCE (particles/m 2 )
3.16E-03 9.292E-04 2.340E-03 4.492E-03 4.790E-03
5.62E-03 4.545E-04 1.145E-03 2.198E-03 2.344E-03
1.00E-02 2.223E-04 5.605E-04 1.076E-03 1.147E-03
1.78E-02 1.039E-04 2.621E-04 5.031E-04 5.365E-04
3.16E-02 4.860E-05 1.226E-04 2.353E-04 2.509E-04
5.62E-02 2.273E-05 5.734E-05 1.100E-04 1.173E-04
1.00E-01 1.063E-05 2.682E-05 5.147E-05 5.489E-05
1.78E-01 4.940E-06 1.247E-05 2.393E-05 2.551E-05
3.16E-01 2.296E-06 5.796E-06 1.112E-05 1.186E-05
38