SLVK225A August 2025 – February 2026 TPS7H5020-SEP , TPS7H5021-SEP
Event rates were calculated for LEO (ISS) and GEO environments by combining CREME96 orbital integral flux estimations and simplified SEE cross-sections according to methods described in Heavy Ion Orbital Environment Single-Event Effects Estimations application report. We assume a minimum shielding configuration of 100 mils (2.54 mm) of aluminum, and “worst-week” solar activity (this is similar to a 99% upper bound for the environment). Using the 95% upper-bounds for the SEL and the SEB/SEGR, the event rate calculation for the SEL and the SEB/SEGR is shown on Table 9-1 and Table 9-2, respectively. Note that this number is for reference since no SEL or SEB/SEGR events were observed.
| Orbit Type | Onset LETEFF (MeV-cm2/mg) | CREME96 Integral FLUX (/day/cm2) | σSAT (cm2) | Event Rate (/day) | Event Rate (FIT) | MTBE (Years) |
|---|---|---|---|---|---|---|
| LEO (ISS) | 47.7 | 4.59 × 10–4 | 4.61 x 10-8 | 2.12 × 10–11 | 8.82 × 10–4 | 1.29 × 108 |
| GEO | 1.51 × 10–3 | 6.95 × 10–11 | 2.90 × 10–3 | 3.94× 107 |
| Orbit Type | Onset LETEFF (MeV-cm2/mg) | CREME96 Integral FLUX (/day/cm2) | σSAT (cm2) | Event Rate (/day) | Event Rate (FIT) | MTBE (Years) |
|---|---|---|---|---|---|---|
| LEO (ISS) | 47.7 | 4.59 × 10–4 | 2.31 x 10-8 | 1.06 × 10–11 | 4.41 × 10–4 | 2.59 × 108 |
| GEO | 1.51 × 10–3 | 3.48 × 10–11 | 1.45 × 10–3 | 7.88 × 107 |