An expanded view of Lada Terra, Venus: New Arecibo radar observations of Quetzalpetlatl Corona and surrounding flows
Bibliographic record
Abstract
Quetzalpetlatl, a corona approximately 800 km in diameter, lies in Lada Terra centered at 68°S, 357°E. It is characterized by vast, radar‐bright lava flows stretching to the southeast for over 1500 km, covering a total area of nearly 600,000 km2. Magellan SAR images covered most of the Quetzalpetlatl flow field, but 12.6 cm Arecibo radar data from March 2001 gives complete coverage of the region. With these new data, we examine the circular polarization properties of the Quetzalpetlatl flow field for comparison with other flows on Venus as well as terrestrial lava. Our analysis suggests that Quetzalpetlatl Corona is primarily a source for flows with 13‐cm‐scale roughness properties similar to terrestrial pahoehoe, and which appear to have traveled down a system of channels or tubes until reaching some unresolved topographic boundary. We also identify four new crater candidates.
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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 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".