Observation of coherent echoes with narrow spectra near 150 km altitude during daytime away from the dip equator
Bibliographic record
Abstract
We present the rare observation of backscatter echoes perpendicular to the geomagnetic field from the 150 km altitude vicinity over a region situated away from the dip equator, namely, at Gadanki (13.5°N, 79.2°E, 6.4° dip latitude). A layer of weak echoes, having Signal‐to‐Noise Ratio (SNR) of the order of −12 to −3 dB, was seen drifting downward from 157 km at 0930 LT to about 148 km at 1028 LT on July 12, 1997. The Doppler velocity as well as Doppler Width was in the range 10–20 ms−1. While there was no quasi‐periodicity as such in terms of echo occurrence, the echo properties were in other respects very similar to 150 km echoes seen in equatorial regions. This included the descending phase with time during the morning hours. These constitute the first observations of daytime 150 km echoes away from the dip‐equator and only add to the mystery regarding the origin of these structures.
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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 | 0.000 | 0.000 |
| 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) | 0.001 | 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".