GroundFallback: Frozen Held-Out Evaluation Evidence, Data, and Reproducibility Code for a Ground-Based ULF Spatial-Coherence Classifier

This is a mixed-rights archive. CC BY 4.0 applies only to creator-owned material to the extent owned by the creator. Third-party material is not relicensed by the Zenodo record license. U.S. Geological Survey source material retains its U.S. Government/public-domain status, and WDC Kyoto Dst-derived values remain subject to WDC Kyoto geomagnetic-index data-use rules (https://wdc.kugi.kyoto-u.ac.jp/wdc/Sec3.html). The Dst data citation is https://doi.org/10.17593/14515-74000