Diagnosing the rapid loss of outer radiation belt electrons due to strong chorus-driven wave-particle interactions along an electron injection path
Bibliographic record
Abstract
Multi-spacecraft data demonstrate that intense chorus waves are excited during electron injection events that drive rapid radiation belt electron loss across a limited energy range from ∼100-300 keV on sub-drift timescales through strong pitch angle diffusion. We use a conjunction of Van Allen Probe A, B, and Arase spacecraft to study the variation of electron fluxes along an electron injection path in the energy range of ∼30 keV–1 MeV during the April 20, 2018, geomagnetic storm. At <∼100 keV, the 90° fluxes remained almost constant; for ∼100–300 keV, the fluxes decreased at all pitch angles; and at >∼300 keV, the fluxes showed a decrease following the injection closer to local midnight, and an increase further along the drift trajectory towards dawn. We calculate electron pitch angle and momentum diffusion coefficients in the observed waves using a quasi-linear approximation: fast losses only occurred at lower pitch angles at <∼100 keV but reached the core distribution for ∼100–300 keV. For >∼300 keV, the overall pitch angle diffusion is weak, but energy diffusion acts to increase the electron flux along the injection path. The results indicate that intense chorus waves drive loss on timescales of ∼10s of minutes through strong pitch angle diffusion that is localized in energy and local time, consistent with the observations. Overall, electron injection events should be associated with intense losses in a limited energy range, the resulting atmospheric impacts having strong local-time dependence, with preferential energy deposition in the morning sector during substorm injections.
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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 | 0.000 | 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 | 0.001 |
| 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 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".