Spacecraft: Suomi 100 Instrument: Camera White light RGB camera Resolution: 2048 x 1536 pixels Angle of view: 43.6° x 33.4° (horizontal x vertical) On-board data processing: Debayering Color correction Gamma correction (gamma=2.2, gamma-break: 0.1) JPEG compression Data: Three images 1. The auroral image: Original (ID: 001229, rotated 180°) File: img001229.jpg Imaging time: January 22, 2019, 18:08:20 UT Location: 62.17°N, 47.64°E, 582865 m (WGS84) Attitude: heading -31.21°, tilt 68.89°, roll -1.85° Integration time: 2.4 seconds Sensor gain: x128 2. The auroral image: Processed version (see Knuuttila et al., JoSS, 2022, for details) File: img001229_processed.png Inverted on-board data processing (excl. debayering) Subtracted the star image (ID: 001264) to compensate warm pixel effec 3. The original star image used for background subtraction (ID: 001264) File: img001264.jpg Imaging time: January 23, 2019, 18:13 UT Attitude: declination -1.3°, right ascension 97.1°, celestial north clock angle -21.8° (J2000) Integration time: 1.6 seconds Sensor gain: x32

2023