Evolution of Solar Filament Channels Observed during a Major Poleward Surge of Photospheric Magnetic Flux
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Abstract
We describe the evolution of a solar filament channel marked by extremes: a length near one solar radius, and a duration of a year. Its genesis centers on an episode of flux emergence so powerful that it launched a surge of photospheric magnetic flux almost to the northern polar cap. This extraordinary injection of new flux at the solar surface occurred in midterm of the longest lived activity complex of cycle 21 (~20 rotations). The new flux emerged just north of the equator as a pair of adjacent activity complexes—a "supercluster" of sunspots—remote from other active regions in a longitude band spanning ~90°. Channels quickly formed along separate polarity inversion lines in this large-scale quadrupolar configuration. None of the initial channels survived more than two solar rotations; none merged to form a greater whole. As individual bipoles within and between the activity complexes expanded, fragmented, and cancelled, only flux at the outermost edges of the adjacent complexes survived, thanks to the remoteness of other strong concentrations of magnetic flux. The result, after three solar rotations, was a simplified bipolar pattern of poleward-streaming flux subject to global processes of flux transport that sustained and extended it for up to a year. The long and long-lived filament channel formed in the shape of a "switchback" along the polarity inversion between the converging streams of opposite polarity flux, continuing along the polarity inversion between the migrating flux and the flux in the polar cap. Our observations reveal large-scale swirled patterns of chromospheric fibrils from which we infer that substantial negative helicity was built up across both adjacent activity complexes during their emergence. The patterns were still detectable in the migrating flux after the source regions had disappeared. Convergence of opposite polarity fluxes with negative helicity leads naturally to dextral filaments and filament channels, consistent with the chirality rule for the northern hemisphere found by Martin, Bilimoria, & Tracadas. We measured the chiralities of 10 filament channels associated with the initial massive emergence of magnetic flux and its subsequent surge poleward. Implications of our findings on models for forming filaments and filament channels are discussed.
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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 it