{"announcement_url":"https://x.com/StormSentinelOr/status/2107653469368676529","archives":[{"name":"Registration DOI","url":"https://doi.org/10.17605/OSF.IO/TQG3C"},{"name":"Addendum 1 \u00b7 thermal-correction sensitivity analysis (DOI)","url":"https://doi.org/10.17605/OSF.IO/D2J73"},{"name":"Internet Archive \u00b7 copy of the OSF registration","url":"https://archive.org/details/osf-registrations-tqg3c-v1"},{"name":"Web archive \u00b7 this page (2026-10-07 02:06 UTC)","url":"https://web.archive.org/web/20261007020609/https://stormsentinel.org/"},{"name":"Web archive \u00b7 record.json (2026-10-07 02:06 UTC)","url":"https://web.archive.org/web/20261007020625/https://stormsentinel.org/record.json"},{"name":"Web archive \u00b7 this page after sealing (2026-10-08 02:24 UTC)","url":"https://web.archive.org/web/20261008022455/https://stormsentinel.org/?status=sealed"},{"name":"Web archive \u00b7 record.json after sealing (2026-10-08 02:20 UTC)","url":"https://web.archive.org/web/20261008022042/https://stormsentinel.org/record.json"},{"name":"Web archive \u00b7 this page with Addendum 1 (2026-10-12 00:23 UTC)","url":"https://web.archive.org/web/20261012002307/https://stormsentinel.org/"},{"name":"Web archive \u00b7 record.json with Addendum 1 (2026-10-12 00:23 UTC)","url":"https://web.archive.org/web/20261012002353/https://stormsentinel.org/record.json"}],"doi":"10.17605/OSF.IO/TQG3C","instrument_log":[{"event":"Metal awning installed next to the sensor site.","utc":"2026-08-14 00:34"},{"event":"Secondary instrument: mechanical adjustment.","utc":"2026-08-30"},{"event":"Secondary instrument relocated.","utc":"2026-09-06"},{"event":"Metal awning partially moved away from the sensors (DC step visible on all primary-instrument channels).","utc":"2026-09-23 13:32"},{"event":"Metal awning fully removed (DC step on all primary-instrument channels, transition about 2 min). Instrument left untouched from here on.","utc":"2026-10-04 21:35"},{"event":"Preregistration submitted to OSF. Test period starts 02:10 UTC; instrument frozen until the end of the period.","utc":"2026-10-07 02:00"},{"event":"Secondary instrument: remote firmware update adding an internal temperature reading (once per minute); 12 s data gap at 01:40 UTC, plus a 5 s gap at 01:50 UTC when its data receiver was restarted. No physical access; primary instrument untouched. Deviation from the frozen-instrument statement for the secondary instrument only.","utc":"2026-10-08 01:40"},{"event":"Host-PC maintenance: the data-acquisition supervisor was restarted (a duplicate instance running since 2026-10-04 was removed). Data gaps: primary instrument 2 s, secondary instrument 3 s. Both instruments untouched; no effect on the 10-min analysis (segments split only at gaps > 30 min).","utc":"2026-10-08 02:32"},{"event":"Addendum 1 registered on OSF (DOI 10.17605/OSF.IO/D2J73): adds a secondary thermal-correction sensitivity analysis, fixed before any test-period result. The registered analysis, its code and its decision rules are unchanged, and the addendum cannot change the verdict. SHA-256 of SHA256SUMS_addendum.txt: 522b093bd81f8208e439a1b9f0c91a9d107644129bca52643b768ebb7d94d14b.","utc":"2026-10-12 00:06"}],"min_days":60,"min_storm_windows":12,"osf_url":"https://osf.io/tqg3c","period_start_utc":"2026-10-07T02:10:00Z","sealed_utc":"2026-10-07 02:00:35 UTC","sha256_analysis_code":"ec864faca86a23495d96b33840ae34f14dfa006ab2e7c81529a38b84a2d873ad","sha256_preregistration":"0eb2c5dde7f413f3d256bc1ec7848bb440fe5fd38f03d67d19bcd946dc3c88fc","sha256_sums_file":"44c5041110e5febbd516ef740bc9d3b38e98100a6ca3fd03af53883a871adb71","status":"sealed","study":"Low-cost fluxgate magnetometer detection of geomagnetic variations: a preregistered validation against USGS Fredericksburg"}