2 papers
physics.space-ph2026
Optical and Radar Observations of the February 2025 Falcon 9 Upper-Stage Re-entry
Juha Vierinen, Dabrowka Knach, Jorge L. Chau +9
We investigate the February 19, 2025, re-entry of a Falcon 9 upper stage using optical observations from 43 meteor cameras across central Europe together with radar detections of r…
physics.space-ph2026
Estimating sub-frame time differences in camera image sequences
Juha Vierinen, Pavithiran Sivasothy, Björn Gustavsson
Some optical measurements require relative timing of intensity variations with accuracy much finer than the camera frame period. One motivating example is dynamic aurora, where dif…