On the Diurnal Variation of Doppler Frequency Shift of Trans-Ionospheric Radio Waves Within Equatorial Ionospheric Anomaly Region in Africa
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Bibliographic record
Abstract
Abstract This paper examined the diurnal variation of the doppler frequency shift (DFS) of a trans-ionospheric high frequency (HF) radio wave signal within the equatorial ionospheric anomaly region. Within the framework of the International Space Weather Initiative, a multi-institutional cooperation set up a HF transmitter and receiver systems at the Space Environment Research Laboratory, Abuja, Nigeria (Geographic: 7.39°E, 8.99°N; dip latitude – 1.37°) and the Department of Physics, University of Lagos, Nigeria (Geographic: 3.27°E, 6.48°N; dip latitude – 1.72°) respectively. Medium-term digital recording of waveforms of trans-ionospheric HF radio signals were obtained from the experimental observation to investigate the diurnal variation of DFS along Abuja – Lagos radio path between 2019 and 2022. The DFS exhibited diurnal variation with maximum at sunrise (5:00–7:00 UT) and sunset (17:00–18:00 UT) periods, as well as day-to-day variability which was attributed to day-to-day variability in the dynamics of flow of plasma in the Equatorial Ionization Anomaly region, meridional neutral winds and local atmospheric conditions in the thermosphere. A large spread of amplitudinal variations of DFS was observed in post Sunset and post-midnight period, while the observed small variations of DFS in midday and afternoon hours is attributed to the displacement of reflection point downward.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it