Crustal Magnetization Source Depths North of the Caloris Basin, Mercury
Bibliographic record
Abstract
Abstract Magnetic measurements collected by the MESSENGER spacecraft showed that Mercury has a crustal magnetic field in addition to a core magnetic field. Within the region of data availability, this crustal magnetic field is strongest in the vicinity of the Caloris impact basin. Two origin hypotheses have been proposed for this observation: magmatic intrusions/buried tectonic features, or Caloris ejecta material. We present a local spherical harmonic spectral analysis of the magnetic data north of the Caloris Basin. Our results yield a best‐fitting source depth between 10 and 72 km below the surface. Source depths shallower than 2.5 km differ by more than one standard deviation from an optimal spectral misfit. Models for Mercury's thermal state at 4 Ga limit the source depth to 40 km for iron as magnetic carrier. Magmatic intrusions at depths between 10 and 40 km may be an explanation for the magnetic sources.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".