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Table 1.
Summary of SWA-EAS design and build and ground calibration results for FM SWA-EAS heads.
| Parameter | Range and | EAS design | EAS build |
|---|---|---|---|
| resolution | goal | and calibration | |
| Sensors | 2 × EA | 2 × EA | |
| Mass | Species | Electrons | Electrons |
| Energy | Range | 1 eV−5 keV | 1 eV−5 keV |
| Energy scan | 64 steps | 64 steps | |
| Resolution (ΔE/E) | 12% | 13% | |
| Analyser constant (eV/V) | 6 | ∼6.65 (SWA-EAS1) ∼6.30 (SWA-EAS2) | |
| Angle | Range (AZ) | 360° | 360° |
| Range (EL) | ±45° | ±45° | |
| Range scan (EL) | 16 steps | 16 steps | |
| Resolution (AZ × EL) | 11.25° × 3°–8° | 11.25° × 6°–12° | |
| Pixel FoV | 11.25° × 3°–8° | 11.25° × 6°–12° | |
| Temporal | Basic accumulation period | 0.96 ms | 0.96 ms |
| Normal mode | 4 s moments | 1 s moments every 4 s or 4 s moments | |
| 100 s full 3D VDFs | 1 s full 3D VDFs every 100 s (or every 400 s or every 10 s) | ||
| Burst mode | 0.125 s p.a.d. | 0.125 s p.a.d. | |
| Triggered mode | 1 s full VDF every 1 s for 5 min | 1 s full VDF every 1 s for 5 min | |
| Sensitivity | Per pixel (cm2 sr eV/eV) | Variable, ≥8.0 × 10−5 | Variable, 8.0 × 10−5 for pixels with clear FoV |
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