Spatiotemporal characteristics of ultra-low frequency dispersive scale shear Alfvén waves in the Earth’s magnetosphere
Bibliographic record
Abstract
The high-latitude nightside auroral zone is threaded by geomagnetic field lines supporting localized ultra-low frequency (ULF) shear Alfvén waves (SAWs). A particular class of dispersive scale ULF waves can be attributed to resonant mode conversion of global scale near-monochromatic compressional waves that are excited by high-speed solar wind flow past the magnetosphere. In the more distant magnetotail, warm plasma dispersive effects preclude the excitation of latitudinally narrow waveforms. Closer to Earth, flux tubes are loaded with colder plasma that favors inertial scale dispersive SAWs and nonlinear wave processes. The spatiotemporal characteristics of ULF shear Alfvén field line resonances near midnight are analyzed, and it is demonstrated that in warm plasma, small-scale nonlinear structuring occurs on field lines where two competing wave dispersion mechanisms cancel. Over realistic time scales, this situation occurs naturally as a result of SAW ponderomotive forces that initiate up-flowing ion motion and Earthward motion of the resonance position in the magnetosphere. The amplitudes, perpendicular widths, and latitudinal dependence of dispersive scale ULF waves are analyzed and compared with ground-based observations.
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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 | 0.000 |
| 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".