Abstract
On 2 September 2021, the first Firefly Alpha rocket launched from Vandenberg Space Force Base in California, USA. Acoustic data were collected at two locations 30 m and 60 m away from the launch pad, at another eight locations located on an arc with a radius of about 300 m, as well as an additional location roughly 8 km away. Around 14 s into the launch, an anomaly occurred, resulting in the premature shutdown of one of the four first-stage engines. By analyzing the overall levels and spectral characteristics of the rocket throughout the different phases of its flight, the effects of the engine shutdown on overall level and spectral peak frequency are discussed. Based on estimated engine parameters, the measured effects are compared to models for clustered nozzles.
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