Notch the spin: I removed a spacecraft's own spin from its recording, and the Moon's 1 Hz whistlers stand 6,385 times over the quiet

A notch that follows the recording in 64-second frames cuts a probe's spin from 175 times its surroundings to at most 22, and leaves the Moon's whistlers standing 6,385 times over the quiet. A spinning spacecraft writes its own rotation into every field sensor it carries, so its data played as sound is the spacecraft, not the space around it. I made a filter that removes the spin and keeps the waves, and applied it to the 1 Hz whistlers, brief chirps of the magnetic field, that ARTEMIS P2 measured in the solar wind beside the Moon on 31 July 2022 (Jia et al. 2026). I measured the spin from the data: 0.244 Hz, one turn every 4.1 seconds. One notch over the whole window failed: it smeared the strong event into the quiet minutes and raised the seventh spin tone there from 2 to 99 times its surroundings. I found no earlier audio of these whistlers. This record holds the paper (OCO paper IP-A25) and its 1 sound. Headphones. Part of The sound of the sky: 12 papers and their sounds: 10.5281/zenodo.23986764.