Review index · Exact coverage JSON
Remaining gaps by original question
Each row describes what still needs an empirical input, a convergence study or a matched validation. A missing physical input is not a zero, and a passing calculation does not close these gaps.
initial · Transmission to nadir at 550 km versus overhead cloud optical depth; cloud-top/above-top source; Rayleigh versus particles.
- Event-specific cloud geometry, overhead gas/aerosol/ozone columns, source angular emission and absolute photon output.
- Validated ice phase/absorption properties and actual aperture/field/time acceptance.
1 · Which radiative-transfer calculation/tool should be used, and alternatives to CloudScat?
- A matched independent transient benchmark using the same real-ice properties and detector estimator.
- A validated event-specific source/cloud model.
Review notebooks: 02
Sources: CT004, CT020, CT021, CT022, CT034, CT053, R4-CLOUDSCAT
2 · Multiple scattering and temporal profile; robustness of 30-80 us versus>200 us rise-time discrimination.
- Consistent rise definitions and independently labeled source depths/classes.
- Intrinsic pulse families, realistic cloud phases/geometry and calibrated receiver response/noise.
- Injection-recovery over actual leading-edge counts, background, sample phase and count losses.
Sources: CT044, DO-ELEC-MMIA-ARCH, DO-ELEC-SAMPLING-MT002, DO-RAD-ANISIMOVA2017, airfly-quenching-physics, bai2023-bath-waveform, li2021-shallow-fast, li2022-multipulse
4 · Absolute nightside 337 nm radiance: quiet airglow, moon, zodiacal light and integrated starlight.
- A total 337 nm scene distribution with measured components and geometry at high latitudes.
- Actual filter/field response, cloud directional reflection and gas transmission.
Review notebooks: 01
5 · Auroral 337 nm 4 nm-band brightness and shot-noise floor during moderate/disturbed conditions.
- A calibrated 4 nm 337 nm radiance/time distribution for the actual high-latitude field and scene.
- Precipitation spectra, arc filling, cloud transfer and actual detector end-of-life noise.
6 · Lunar phase/elevation at which cloud background dominates detector noise.
- Validated 337 nm lunar irradiance versus phase/libration and cloud illumination geometry.
- Chosen receiver noise/temperature, spectral-angular response and cloud reflection.
Review notebooks: 01
Sources: BG012, BG013, BG015, BG016, BG025, BG038, BG039, BG040
7 · Detector choice at 337 nm, large area and 10-50 kHz; claimed photodiode/TIA floor.
- Selected sensor/package 337 nm PDE or responsivity, actual sensitive area/capacitance and bias/temperature-dependent dark PSD or correlated-count distribution
- Complete readout noise, impulse response, power and permitted readout mode; for CMOS, measured full accepted-area cadence and summed read noise, not minimum exposure alone
Sources: DO-DET-GSENSE400, DO-DET-S13360-AREA, DO-DET-S8664-LARGE, DO-DET-SISMUV2025, DO-ELEC-ADI2015, DO-ELEC-TIA-BAILEY2026, DO-WIDEGAP-SG01D
8 · NEP and aperture photons per event for candidate detectors.
- Actual receiver spectral noise/count statistics, gain/excess noise and target-band throughput at beginning/end of life
- Injection-recovery versus aperture photon fluence under relevant backgrounds, integration windows, pulse shapes and false-trigger rules
Sources: DO-DET-S13360-AREA, DO-ELEC-ADC-ENBW2019, DO-ELEC-APD-NOISE, DO-ELEC-FEMTO-DLPCA, DO-METHOD-NEP2025, EU-lcsur
9 · DC coupling and preservation of a>3 ms pulse.
- Full-chain optical impulse/step and>3 ms pulse response across faint/background/overload conditions
- Droop, pedestal, saturation, recovery, discrimination/dead time and pulse-phase bias with actual ADC integration/filtering
Review notebooks: 01
Sources: DO-ELEC-CALIOP-TRANSIENT2026, DO-ELEC-ET-DC, DO-ELEC-MMIA-ARCH, DO-RAD-ANISIMOVA2017, EU-etbase
10 · 2-3 year 550 km polar/SAA radiation effects on dark current and gain.
- Selected device/lot pre/post proton, TID and SEE tests at intended temperatures, including PDE/gain, noise PSD/DCR, correlated noise and annealing limits
- Prompt particle/window/coating/electronic pulse shapes and false-event/veto response of the assembled head
Review notebooks:
Sources: DO-PARTICLE-ICECUBE2011, DO-PARTICLE-TUS2021, DO-RAD-ANISIMOVA2017, DO-RAD-DSOUZA2021, DO-RAD-GRB2025, DO-RAD-GRID2022, DO-RAD-SPOOQY2025, DO-RAD-ULTRASATTID2023
11 · European suppliers for flight or near-flight detectors.
- Part/lot-specific spectral calibration at 337/777 and accepted qualification/acceptance results for the actual detector, base, HV and readout build
Review notebooks:
Sources: EU-et9111, EU-et9113, EU-etbase, EU-etprecautions, EU-excelfactory, EU-fsapd, EU-fsesa, EU-lcfactory, EU-lcsur, EU-photekds, EU-uvit
12 · Maximise nonimaging photometer etendue within roughly 1U.
- Assembled field/pupil/wavelength response, vignetting, detector illumination uniformity, throughput and baffle/stray-light rejection
Review notebooks: 01
Sources: DO-DET-GLIMS2011, DO-ELEC-MMIA-ARCH, DO-OPT-ETENDUE1985
13 · Maintain narrowband filter response over 60-90 degree full field.
- Filter transmission map versus wavelength, actual ray angle/cone, polarization, temperature and vacuum for the selected coating
- Full-field assembled spectral response including pupil weighting and tolerances
Review notebooks: 01
Sources: DO-ELEC-MMIA-ARCH, DO-OPT-ALLUXA-THERMAL2014, DO-OPT-LIS2000
14 · Is 4 nm FWHM optimal for the N2(0, 0)band and background?
- Representative source-band spectra or validated physical spectral model constrained by source conditions
- Scene/background spectra and actual assembled filter/detector response with stable wavelength registration
Review notebooks: 01
Sources: BG035, BG048, BG054, BG055, BG056, BG057, DO-OPT-ALLUXA337
15 · Required optical density and rejection wavelength range.
- Dynamic-range-qualified leak/blocking scan through detector cutoff, including pinholes, angle/polarization/thermal changes and induced fluorescence
- Scene spectra sufficient to bound out-of-band photoelectrons and stray light under permitted night/Moon/twilight conditions
Review notebooks: 01
Sources: BG035, BG038, DO-OPT-ALLUXA337, DO-OPT-SOPAPILLA2026, DO-PARTICLE-TUS2021, juice2026-majis-spectra
16 · 777.4 nm null-channel detector and comparable photon thresholds.
- Both full-chain photon-scale spectral/field response, background/noise, live time and impulse response, including dead time, saturation and recovery
- Red-channel upper-limit coverage and joint false-negative/false-classification performance using calibrated injections and representative source controls
Sources: DO-DATA-LEAL2026, DO-DET-H16722-RED, DO-DET-S8664-LARGE, DO-ELEC-MMIA-ARCH, DO-PARTICLE-TUS2021, DO-RAD-ANISIMOVA2017, chuang2022-catalogue-actual-joint-flags
17 · Cross-calibration of different detector technologies for a trustworthy ratio.
- Traceable common-source calibration across each channel spectrum, field, pulse fluence and operating temperature with overlapping attenuation ranges
- Relative delay/IRF and systematic covariance, plus repeated stability checks and independent reference monitoring
Sources: DO-CAL-CALSPEC2026, DO-CAL-NPL-ANALOG2026, DO-ELEC-MMIA-ARCH, DO-ELEC-SOPAPILLA2026, DO-OPT-NIST-WAVELENGTH
18 · On-orbit gain drift, absolute radiometric stability and peak brightness versus current.
- Independent optical reference/monitor stability and full-path throughput/PDE drift at science wavelengths, with separate multiplication-gain and offset diagnostics
- If using stars, actual attitude/path/field response and differential-background covariance; if inferring current, independent current/radio-optical/source-condition calibration
Review notebooks:
Sources: DO-CAL-CALSPEC2026, DO-CAL-ISUAL2012, DO-CAL-JENKINS2026, DO-CAL-OMI2022, DO-CAL-OMPS2023, DO-CAL-SALDANHA2017, airfly-quenching-physics, guo2025-independent-streamer-field, pervez2024-current-inverse
19 · Ground calibration/characterisation and facilities.
- Configuration-specific traceable spectral/angular/pulsed receiver calibration with stated uncertainty
- Noise/linearity/trigger/timing/bright-light recovery, environmental qualification and contamination/radiation tests for selected build
Review notebooks:
Sources: DO-CAL-ESA-OOEL, DO-CAL-NIST2007, DO-CAL-NPL-ANALOG2026, DO-CAL-PTB340-2024, DO-CAL-SALDANHA2017, DO-OPT-NIST-WAVELENGTH
20 · Laboratory 337 nm source with 30 us rise and>3 ms duration.
- Optical waveform measured by a sufficiently fast reference at actual drive/temperature: 30 us rise, >3 ms duration, stability and recovery
- Spectrum/filter capture and calibrated attenuation from faint through overload, with stray-light control
Sources: DO-CAL-AUGER2009, DO-CAL-ICECUBE337-2010, DO-CAL-LEDD1B, DO-CAL-M340L5
21 · Can 2-4 kg/5-10 W deliver a useful event rate at 550 km?
- Faint source/dual-band population with calibrated completeness and non-detections.
- Packaged optical/electronic/thermal/power design, field response, backgrounds and end-of-life injection-recovery.
- Actual orbit/time/exposure, health/safing, telemetry and false-classification controls.
Sources: DO-ELEC-MMIA-ARCH, ahmad2014-2015-uppsala-opposing-evidence, bai2023-bath-waveform, bath2023-context-waveform, bitzer2026-group-matching, night-selection-layer-shadow, soler2022-peak-bins
22 · What assumptions or physics are missing?
- Selected receiver calibration and end-of-life response.
- Realistic source/cloud/noise classes and independent physical labels.
- Unbiased joint population/exposure and validated operational false-event control.
Review notebooks: 00, 01, 02, 03, 04
Sources: DO-CAL-SALDANHA2017, DO-ELEC-MMIA-ARCH, DO-PARTICLE-ICECUBE2011, DO-PARTICLE-TUS2021, R4-CLOUDSCAT, bai2023-bath-waveform, chuang2022-catalogue-actual-joint-flags, pervez2024-current-inverse