{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"34660f44dc500d7e4050fa5e932925aa0d9a418d65b347489e09b971073cd03b","created":"2026-10-03T07:18:08Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"d570527601937098dc460e4380c249ff995ef62332c78d5be1fe13e9dd60cf01","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":[],"external_id":"plasma.kinetic-turbulence-dynamo.sub-ion-spectrum","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[],"plain":"Below the size of ion orbits, the solar-wind magnetic fluctuation spectrum steepens. Whether these fluctuations are a kind of wave or a collection of thin current sheets, and why the slope has its value, are open.","posed_since":"","precise":"Between ion and electron gyroscales the magnetic spectrum follows $E(k) \\sim k^{-\\alpha}$ with $\\alpha$ about 2.8. Determine whether the fluctuations are kinetic Alfven waves, whistler waves or sheet-like structures, and derive $\\alpha$ (theory proposals include $7/3$, $8/3$ and 3). An answer is a theory matching measured $\\alpha$, polarization and anisotropy.","problem_ref":null,"references":"","settled_by":"Simultaneous spacecraft measurements of spectral slope, polarization and wavevector anisotropy matched by one theory and by kinetic simulations.","status_note":"","title":"Nature and spectral slope of sub-ion-scale turbulence","topic_ref":"0fbe23e43e59314b73b802e78f2d2325c4a6b8b6a539d5dd3f6690b91375cb5f"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"b0fec144ff8c8c5fb868deede4c992179e1f5ff5134c540b0edafc32c1ddb2ad","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"2f212f8fc379bbcdb7a6f2e56c6ac6a5fef8437602bb96813119d5a7771a4a65","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"rk4now3-BvShSAgkqGIFpFfznecIiTK2w4AUovsgZyHV0D5oQ0JOBl2l_XxuLBHiuq4mJ4objcMp5CILWcsXAA"},"schema":"pubphys.envelope/1"},"record_hash":"b0fec144ff8c8c5fb868deede4c992179e1f5ff5134c540b0edafc32c1ddb2ad","leaf_index":1849}