Ground-based observations and plasma instabilities in auroral substorms
Bibliographic record
Abstract
One of the “grand challenge” problems in space science today involves determining what mechanism triggers the intensification and expansive phase of the magnetospheric substorm. Remote sensing of the ionosphere has provided some clues to the process, leading researchers to the conclusion that the physics of the intensification is inherently fast and explosive. In particular, ground-based observations show the brightening of the auroral arc and the formation of large scale vortex structures in the ionosphere to take place on time scales of tens of seconds. High earthward pressure gradients, enhanced field line curvature, and strong convective flows with large-amplitude westward components, point to the shear flow ballooning instability (SFBI) as the mechanism leading to the intensification. New results from the meridian scanning photometers and the all sky imager of the Canadian Auroral Network for the OPEN Program Unified Study array show the time delay between the formation of these vortex structures and the beginning of enhanced reconnection in the midtail region of the magnetotail to be of the order of 1–5 min. This timing presents a serious constraint for many substorm models. In this paper we shall discuss the observational support for the SFBI model and highlight some of the other plasma instabilities thought to lead to expansive phase onset.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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".