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arxiv: 2605.22233 · v1 · pith:LA42PRTCnew · submitted 2026-05-21 · 🌌 astro-ph.SR

A Robust Deep Learning Framework for Prominence Detection through Composite Feature Representations

Pith reviewed 2026-05-22 04:13 UTC · model grok-4.3

classification 🌌 astro-ph.SR
keywords solar prominencesdeep learningobject detectionEUV imagingYOLOv5space weatherfeature representationinstrument calibration
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The pith

Composite three-channel images enable deep learning models to detect solar prominences based on physical features rather than image artifacts.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper shows how to build a deep learning system that finds solar prominences in spacecraft images of the Sun. Earlier attempts suffered when models learned to respond to the false colors in the pictures instead of the actual shapes and positions of the prominences. The authors create composite inputs by combining different versions of each image and fixing changes in the instruments over time. Their best model reaches a mean average precision of 0.749 and recalls 78 percent of the prominences in test images while also working on data from a different telescope. This matters because prominences can erupt and drive space weather events that affect Earth.

Core claim

Using an existing labeled dataset, trained YOLOv5 models show bias toward the 304 Å colormap. The authors develop composite models with three-channel images from a preprocessing pipeline that includes full-disk grayscale, full-disk enhanced corona, and disk-removed images, with corrections for instrument degradation. The composite model achieves a mAP@50 of 0.749 and a recall of 78% on the test set, outperforming previous bounding box methods. Visual analysis reveals many apparent false positives are valid unlabeled prominences, and the model generalizes to SUVI data.

What carries the argument

The composite feature representation from a dataset preprocessing pipeline that constructs three-channel images combining full-disk grayscale, enhanced corona, and disk-removed views while correcting for instrument degradation to maintain consistent features across the solar cycle.

If this is right

  • The composite model outperforms previous bounding box methods for prominence detection in EUV images.
  • Many apparent false positives turn out to be valid but unlabeled prominences.
  • The model demonstrates cross-instrument generalization when tested on SUVI image data.
  • Recommendations for robust dataset construction help avoid biases in future models.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Similar composite preprocessing could improve detection of other dynamic solar features such as filaments or coronal mass ejections.
  • Real-time application of this model might support automated space weather alert systems.
  • Extending the approach to time-series data could track prominence evolution and eruption risks more effectively.

Load-bearing premise

The existing labeled prominence dataset is complete enough and free of systematic labeling bias so that the model's performance numbers and reclassified false positives reflect real physical feature detection.

What would settle it

Independent expert labeling of model outputs on a fresh set of EUV images from the same or different instruments, checking whether the detections correspond to actual prominences not present in the original training labels.

Figures

Figures reproduced from arXiv: 2605.22233 by Harry Birch, Richard Morton, St\'ephane R\'egnier.

Figure 1
Figure 1. Figure 1: Examples of the data in each channel, shown from left to right: grayscale, WOW-processed, disk-removed grayscale, and the 3-channel composite image formed by combining all three channels. in which all three channels contain data representations with the disk removed. In this case, the first channel was additionally log-scaled to distinguish it from the third channel with the disk-removed. We use the same d… view at source ↗
Figure 2
Figure 2. Figure 2: Top: Example images for testing color bias showing (from left to right) the original RGB channel, and the three replicated channels (RRR, GGG, BBB). Bottom: Bar chart showing the number of predictions per image when testing inference on each of the four image types above. The bars are segmented between true positives (darker shades) and false positives (lighter shades). For a second test, we utilized permu… view at source ↗
Figure 3
Figure 3. Figure 3: Top: Example images for testing color bias showing the different RGB channel permutation (from left to right), RBG, GRB, GBR, BRG, BGR. Bottom: Bar chart showing the number of predictions per image when testing inference on each of the five permutation types above. The bars are segmented between true positives (darker shades) and false positives (lighter shades). and disk-removed representations. The secon… view at source ↗
Figure 4
Figure 4. Figure 4: Sample of inference results for the 304-colormap model (right), 3-channel composite model, and the composite models disk-removed. Boxes are colored according to true positives, in yellow, and false positives, in magenta. Confidence scores are displayed in the top-left corner of each box [PITH_FULL_IMAGE:figures/full_fig_p011_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Sample of inference results using the composite model testing on SUVI data (first row), and temporally matched SDO/AIA images (bottom row). Detection boxes are in blue with confidence scores displayed in the top-left corner of each box [PITH_FULL_IMAGE:figures/full_fig_p012_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Number of instances per image for each year, grouped by the full groundtruth labels and model predictions. composite model and 93% for the disk-removed model. We select the composite model for further analysis due to its exploratory nature in addition to its superior recall, making it better suited for discovering previous uncatalogued prominences. Cross-instrument testing show that the composite models ge… view at source ↗
read the original abstract

Solar prominences are dynamic structures suspended within the solar corona and are manifestation of solar activity. Their evolution includes eruptions linked to coronal mass ejections, making their detection critical for space weather monitoring and forecasting. The vast amounts of high-cadence data provided by missions such as SDO/AIA motivate the application of deep learning frameworks capable of assimilating large-scale datasets. However, previous studies have reported poor model performance caused by contamination from hot coronal emission from the EUV HeII 304 {\AA} channel. Using an existing labeled prominence dataset, we find that trained YOLOv5 object detection models exhibit a strong bias towards the 304 {\AA} colormap, rather than physically meaningful prominence features. We develop a further two models comprising three-channel images constructed through an original dataset preprocessing pipeline: (i) full-disk grayscale, full-disk enhanced corona, and disk-removed, (ii) same as (i) with all disk-removed images. Our pipeline corrects instrument degradation to maintain more consistent feature representations across the solar cycle. The composite model (i) achieves a mAP@50 of 0.749 and a recall of $78\%$ on the test set, outperforming previous bounding box methods. Visual analysis of the composite models reveals that many apparent false positives are valid unlabeled prominences. We additionally demonstrate cross-instrument generalization by testing the composite model on SUVI image data. By examining dataset biases that propagate into model predictions, we provide recommendations for robust dataset construction. We present a reliable, physically-motivated, and versatile deep learning model to automatically detect prominences in EUV images, providing a framework beneficial for space weather applications.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 3 minor

Summary. The manuscript presents a deep learning approach using YOLOv5 for solar prominence detection in SDO/AIA EUV images. It identifies bias in standard models toward the 304 Å channel and introduces composite three-channel inputs (full-disk grayscale, enhanced corona, and disk-removed) via a preprocessing pipeline that corrects instrument degradation. The composite model (i) reports mAP@50 = 0.749 and 78% recall on a held-out test set, outperforming prior bounding-box methods; visual inspection is used to reclassify many false positives as valid but unlabeled prominences. Cross-instrument generalization to SUVI data is demonstrated, along with recommendations for robust dataset construction.

Significance. If the performance gains and reclassification of false positives are substantiated, the work would offer a practical advance for automated prominence detection in high-cadence solar imagery, with direct relevance to space-weather monitoring. The emphasis on addressing label incompleteness and channel bias through composite representations and preprocessing is a constructive contribution, and the SUVI generalization test provides evidence of broader applicability.

major comments (2)
  1. [Abstract / Results] Abstract and Results section: The headline mAP@50 = 0.749 and recall = 78 % (and the claim of outperformance over previous bounding-box methods) rest on post-hoc visual reclassification of a substantial fraction of apparent false positives as true but unlabeled prominences. This procedure is described as subjective visual analysis without reported quantitative cross-validation (e.g., inter-rater agreement, comparison against an independent catalog, or blinded expert scoring). If the original training labels contain systematic omissions (faint off-limb structures, morphological classes, or cycle-dependent features), the metrics may reflect dataset artifacts rather than improved physical-feature learning.
  2. [Methods / Dataset] Methods / Dataset section: The preprocessing pipeline corrects instrument degradation to maintain consistent feature representations across the solar cycle, yet no quantitative assessment is provided of how this affects label completeness or the distribution of missed prominences in the reference dataset. The assumption that the existing labeled dataset is sufficiently complete therefore remains untested and load-bearing for the interpretation of false positives.
minor comments (3)
  1. [Methods] Clarify the exact train/validation/test split ratios, the number of images per split, and whether any data augmentation or balancing was applied to address class imbalance.
  2. [Results] Provide error bars or confidence intervals on the reported mAP and recall values, and state whether they were obtained from a single run or multiple random seeds.
  3. [Methods] Specify the precise channel weights or combination rule used to construct the three-channel composite images; the abstract lists them as free parameters but does not give their values or selection procedure.

Simulated Author's Rebuttal

2 responses · 1 unresolved

We are grateful to the referee for the constructive and detailed review of our manuscript on solar prominence detection. The comments have prompted us to clarify key aspects of our methodology and results presentation. We respond to each major comment below, providing honest clarifications drawn from the manuscript content and indicating revisions where we concur that adjustments improve the work.

read point-by-point responses
  1. Referee: [Abstract / Results] Abstract and Results section: The headline mAP@50 = 0.749 and recall = 78 % (and the claim of outperformance over previous bounding-box methods) rest on post-hoc visual reclassification of a substantial fraction of apparent false positives as true but unlabeled prominences. This procedure is described as subjective visual analysis without reported quantitative cross-validation (e.g., inter-rater agreement, comparison against an independent catalog, or blinded expert scoring). If the original training labels contain systematic omissions (faint off-limb structures, morphological classes, or cycle-dependent features), the metrics may reflect dataset artifacts rather than improved physical-feature learning.

    Authors: We thank the referee for this observation. The reported mAP@50 of 0.749 and recall of 78% are computed strictly against the original test-set labels using standard object-detection evaluation protocols; no reclassification of false positives is applied to these figures. The visual analysis is presented separately in the Results section solely to illustrate that many model detections correspond to physically plausible but unlabeled prominences, thereby highlighting label incompleteness in the reference dataset rather than modifying the quantitative metrics. We acknowledge that this visual inspection is subjective and lacks the quantitative safeguards mentioned. In the revised manuscript we have inserted explicit language in both the Abstract and Results sections stating that performance numbers rely exclusively on the original labels, added a dedicated paragraph discussing the implications of label incompleteness as a dataset limitation, and noted the desirability of future blinded expert validation or cross-catalog comparisons. revision: yes

  2. Referee: [Methods / Dataset] Methods / Dataset section: The preprocessing pipeline corrects instrument degradation to maintain consistent feature representations across the solar cycle, yet no quantitative assessment is provided of how this affects label completeness or the distribution of missed prominences in the reference dataset. The assumption that the existing labeled dataset is sufficiently complete therefore remains untested and load-bearing for the interpretation of false positives.

    Authors: We agree that a direct quantitative evaluation of the preprocessing pipeline’s influence on label completeness would be desirable. Such an evaluation would require expert re-annotation of a substantial subset of images or construction of an independent reference catalog, tasks that exceed the scope of the present study, which centers on the design of the composite three-channel representation and the resulting detector. The pipeline’s primary purpose is to mitigate long-term instrument degradation so that feature statistics remain more stable across the solar cycle; we have expanded the Methods section to include a qualitative explanation of this consistency benefit and its role in reducing channel-specific bias. We have also added an explicit statement in the revised text acknowledging that completeness of the reference labels is an assumption and discussing its bearing on false-positive interpretation. revision: yes

standing simulated objections not resolved
  • Quantitative cross-validation (inter-rater agreement, blinded scoring, or independent catalog comparison) for the visual reclassification of false positives

Circularity Check

0 steps flagged

Empirical ML evaluation on held-out test set is self-contained with no derivation reducing to inputs by construction

full rationale

The paper trains YOLOv5-based object detectors on an existing labeled prominence dataset and reports standard performance metrics (mAP@50 = 0.749, recall 78%) computed against a held-out test set. These quantities are direct empirical outputs of the supervised learning pipeline and do not involve any fitted parameter that is then renamed as a prediction, nor any self-definitional loop in which the target is defined in terms of the model output. The supplementary visual reclassification of false positives is presented as an observational note rather than a load-bearing step in any derivation chain. No uniqueness theorems, ansatzes, or self-citations are invoked to justify core claims. The central results therefore remain independent of the inputs by construction and constitute a normal, non-circular empirical benchmark.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The work rests on an existing labeled prominence dataset whose completeness is taken as given, plus the assumption that instrument-degradation correction produces stable feature statistics across the solar cycle. No new physical entities or free parameters beyond standard YOLOv5 hyperparameters are introduced.

free parameters (1)
  • channel combination weights
    The specific choice of grayscale, enhanced-corona, and disk-removed channels is selected by the authors to mitigate observed bias.
axioms (1)
  • domain assumption The provided labeled prominence dataset accurately reflects physical prominences without systematic labeling bias
    Performance claims and false-positive reclassification depend on this dataset being a reliable ground truth.

pith-pipeline@v0.9.0 · 5837 in / 1440 out tokens · 54384 ms · 2026-05-22T04:13:59.545729+00:00 · methodology

discussion (0)

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Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

  • IndisputableMonolith/Cost Jcost unclear
    ?
    unclear

    Relation between the paper passage and the cited Recognition theorem.

    The composite model (i) achieves a mAP@50 of 0.749 and a recall of 78% on the test set... three-channel images constructed through an original dataset preprocessing pipeline: (i) full-disk grayscale, full-disk enhanced corona, and disk-removed

  • IndisputableMonolith/Foundation/RealityFromDistinction reality_from_one_distinction unclear
    ?
    unclear

    Relation between the paper passage and the cited Recognition theorem.

    Our pipeline corrects instrument degradation to maintain more consistent feature representations across the solar cycle

What do these tags mean?
matches
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supports
The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends
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uses
The paper appears to rely on the theorem as machinery.
contradicts
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unclear
Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.

Reference graph

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