Transport of thermal‐energy ionospheric oxygen (O<sup>+</sup>) ions between the ionosphere and the plasma sheet and ring current at quiet times preceding magnetic storms
Bibliographic record
Abstract
The presence of energetic O + ions in the ring current at the onset of a magnetic storm prompts the question of the possible role of “in‐transit” ionospheric O + ions between the ionosphere and the plasma sheet and ring current in the quiet periods immediately preceding the main phase of a magnetic storm. Thermal‐energy O + ions are often observed in the quiet time high‐altitude (>7000 km) polar ionosphere on Akebono, at temperatures of ∼0.2–0.3 eV and flow velocities of a few km/s. In this paper, we use single‐particle trajectory simulation to study the transport of these ions in the periods preceding a number of large magnetic storms (Dst < −100 nT). Our simulation shows that due to centrifugal ion acceleration at higher altitudes (above ∼3 R E altitude), about 10–20% of polar wind and other low‐energy O + ions reaches the plasma sheet during such periods; the actual percentage is a factor of ∼3 larger in the dusk sector on average compared with the dawn sector and dependent on the IMF and the O + ion temperature. This provides a low but non‐negligible flux of O + ions between the ionosphere and the plasma sheet and ring current, which is believed to constitute a significant “in‐transit” oxygen ion population over a period of a few (∼4) hours preceding a magnetic storm. Such a population could explain the presence of energetic O + ions at the onset of the main phase of the storm, when the heavy ions could potentially modify the evolution of the ring current.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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 teacher head, 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".