Nighttime thermospheric-ionospheric coupling during geomagnetic storms
Bibliographic record
Abstract
The electrodynamics of the ionosphere in the tropical region presents various scientific aspects, which remain subject of intensive investigations and debates by the scientific community. During the year 2002, in a joint project between Universidade do Vale do Paraíba (UNIVAP) and Universidade Luterana do Brasil (ULBRA), a chain of three Canadian Digital Ionosondes (CADIs) was established nearly along the geomagnetic meridian direction, for tropical ionospheric studies, such as, the generation and dynamics of ionospheric irregularities, changes and response due to geomagnetic disturbances and thermosphere-ionosphere coupling, in the Brazilian sector. The locations of the three ionosonde stations are São José dos Campos (23.2o S, 45.9oW, dip latitude 17.6o S - under the Equatorial Ionospheric Anomaly), Palmas (10.2oS, 48.2o W, dip latitude 5.5o S near the magnetic equator) and Manaus (2.9oS, 60.0o W, dip latitude 6.4oN near the magnetic equator). It should be pointed out that Palmas and Manaus are located on opposite side of the magnetic equator but both are south of the geographic equator. The three CADIs work in time-synchronized mode and obtain ionograms every 5 minutes. This unique configuration of the ionospheric sounding stations allowed us to study the F-region dynamics during disturbed periods in the months of August and September 2002. Then an extension of the servo model was used to infer the magnetic meridional component of the thermospheric neutral winds over the low latitude station. The coefficients of diffusion, recombination and loss rate, required in the servo equations, were calculated using an appropriated atmospheric model (MSIS-90). In this paper we show that the ionospheric parameters h0F, hpF2, FoF2 and the inferred meridional wind are strong affected by the geomagnetic storms.
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How this classification was reachedexpand
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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.007 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
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; both teacher heads agree on what is shown here.
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".