The role of compressional Pc5 pulsations in modulating precipitation of energetic electrons
Bibliographic record
Abstract
Pc5 (1.67–6.67 mHz) magnetic pulsations and the modulation of energetic electron precipitation are often observed simultaneously in the morning auroral‐latitude data. Here we have investigated a conjunction event of Cluster spacecraft and Canadian auroral‐latitude ground stations to identify the role of compressional Pc5 pulsations in modulating precipitation of energetic electrons observed by ground‐based riometers. On 7 December 2002 as the spacecraft moved between L = 4.0 and 6.5 in the dawn sector (0600–0700 magnetic local time (MLT)), we found a monochromatic Pc5 magnetic pulsation at ~4.0 mHz simultaneously in space and on the ground. Both Cluster and ground magnetometer data confirmed that the resonant oscillation at 4.0 mHz occurred around L = ~6.0. Simultaneously, the four Cluster spacecraft identified the compressional Pc5, which was accompanied by similar temporal variations of the fluxes of medium energy (tens to hundreds of keV) electrons and of the intensity of whistler mode chorus waves. While the compressional Pc5 was present in the magnetosphere, the riometers near the spacecraft footprint observed the coincident modulation of electron precipitation at ~4.0 mHz. Our coordinated observations indicate a convincing relationship between compressional Pc5 magnetic pulsations in the magnetosphere and the modulation of electron precipitation in the ionosphere, mediated by chorus waves modulated in the magnetosphere, as predicted by the theory of Coroniti and Kennell [ ]. Around the resonant shell, however, some additional contributions to the modulation of electron precipitation might also come from the effects of the resonant Pc5 oscillation.
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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".