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arxiv: 2604.15160 · v1 · submitted 2026-04-16 · 🌌 astro-ph.SR

Radiation doses during extreme solar energetic particle events

S. Dalla , K. Herbst , R. Muscheler , M.J. Owens This is my paper

Pith reviewed 2026-05-10 09:55 UTC · model grok-4.3

classification 🌌 astro-ph.SR
keywords solar energetic particlesSEP eventsradiation dosesaviationastronautscosmogenic radionuclidesspace weatherextreme events
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The pith

Extreme solar energetic particle events could deliver radiation doses at aviation altitudes and in space far above recent levels.

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

The paper tries to establish first estimates of radiation doses during extreme solar energetic particle events by extrapolating from radionuclide spikes recorded in the distant past. It explains the dependence of these doses on SEP fluence and spectrum by first reviewing well-observed recent events and then applying the same conditions to historical extremes. A sympathetic reader would care because the results bound the potential health risks to aircrew, passengers, and astronauts from rare but intense space weather.

Core claim

The central claim is that worst-case radiation dose estimates for extreme SEP events can be derived from radionuclide data by assuming that each spike corresponds to a single event with the same particle spectrum and geomagnetic conditions as in modern times. These provide initial quantitative assessments of risks to aviation crews, passengers, and astronauts.

What carries the argument

The conversion of cosmogenic radionuclide production rates into SEP fluence and spectrum parameters, which then feed into atmospheric radiation transport calculations for dose estimation.

If this is right

  • Aviation radiation levels during extreme events would be much higher than in recent decades, increasing health risks for crew and passengers.
  • Astronauts would receive substantially elevated doses, impacting mission safety and duration.
  • Spacecraft would experience higher particle fluxes, raising the likelihood of system anomalies.
  • These estimates can serve as reference points for developing mitigation strategies like flight rerouting or shielding.
  • Risk models for space weather must incorporate these upper limits for extreme events.

Where Pith is reading between the lines

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

  • If historical spikes resulted from multiple overlapping SEP events rather than single ones, the per-event doses would be lower than calculated here.
  • Incorporating variations in past geomagnetic field strength could lead to more precise dose maps for different latitudes.
  • These worst-case figures might help set standards for radiation exposure limits in future commercial spaceflight.
  • Linking the estimates to modern SEP detection could improve forecasts for when such extreme doses might recur.

Load-bearing premise

The assumption that the radionuclide spike was caused by a single SEP event and that the particle spectrum and geomagnetic conditions were the same during all events.

What would settle it

Detection of multiple distinct SEP events contributing to what appears as a single radionuclide spike in the record, or measurements showing different spectra for ancient events.

Figures

Figures reproduced from arXiv: 2604.15160 by K. Herbst, M.J. Owens, R. Muscheler, S. Dalla.

Figure 1
Figure 1. Figure 1: Effective dose at typical aviation altitudes (35,000 feet) at the geomagnetic pole for the cosmogenic radionuclides events and for GLE 5. The shaded area indicates the region where the calculated dose exceeds the approximate threshold for acute effects, Et (dashed line) [PITH_FULL_IMAGE:figures/full_fig_p005_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Effective dose in deep space for the cosmogenic radionuclides events and for GLE 5. The shaded area indicates the region where the calculated dose exceeds the approximate threshold for acute effects, Et (dashed line). F200 as representative fluence parameter because protons of energy greater than about 100 MeV are capable of travelling to low altitudes in Earth’s atmosphere, where they produce secondary pa… view at source ↗
read the original abstract

Ions and electrons accelerated to high energies during flares and coronal mass ejections at the Sun may escape the solar atmosphere and, guided by the interplanetary magnetic fields, propagate through space to near-Earth locations. These Solar Energetic Particles (SEPs) can be detected directly by spacecraft instrumentation. The highest energy SEPs may also propagate through the geomagnetic field and precipitate to low atmospheric heights, producing secondary particles including neutrons and protons that trigger the formation of cosmogenic radionuclides. The space weather effects associated with the SEP ion population (for the most part protons) consist principally of radiation risk to aviation, humans in space and spacecraft. This paper focusses on the risks to aviation and astronauts and emphasizes how the parameters of the SEP event, including fluence and spectrum, affect radiation doses. Space weather effects for events that took place in recent decades, for which a large body of measurements and models exist, are discussed. SEP events of extreme magnitudes, such as those extrapolated from radionuclide data from the distant past are then considered and first estimates of the associated radiation at aviation altitudes and in space presented. These are worst-case estimates derived within the assumption that the radionuclide spike was caused by a single SEP event and that the particle spectrum and geomagnetic conditions were the same during all events.

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 / 1 minor

Summary. The manuscript reviews radiation risks from solar energetic particles (SEPs) to aviation and astronauts, discussing effects from recent decades with available measurements and models. It then extrapolates to extreme SEP events inferred from radionuclide spikes in the distant past, presenting first-order worst-case dose estimates at aviation altitudes and in space. These estimates are explicitly conditional on the assumptions that each radionuclide spike resulted from a single SEP event and that the particle energy spectrum and geomagnetic conditions matched those of modern observed events.

Significance. If the estimates are substantiated, the work supplies useful conditional worst-case radiation dose figures for extreme SEP events, which are relevant for aviation safety protocols and astronaut mission planning. The upfront framing of the key assumptions allows readers to interpret the results appropriately rather than as unconditional predictions. The approach builds on external radionuclide data rather than internal parameter fitting, which is a methodological strength when the premises hold.

major comments (2)
  1. [Abstract] Abstract: The estimation approach and key assumptions are outlined, but no specific models, data sources, calculations, error bars, or validation against observations are supplied. This prevents assessment of the quantitative dose values beyond the stated premises and makes the central claims difficult to evaluate for soundness.
  2. [Abstract] Abstract: The worst-case estimates are load-bearing on the assumption that radionuclide spikes were produced by single SEP events with particle spectra and geomagnetic conditions identical to modern observations. The manuscript should include sensitivity tests or discussion of how deviations from this assumption (e.g., multiple events or different spectra) would alter the reported doses, as this is the weakest and most consequential premise.
minor comments (1)
  1. [Abstract] The abstract could be expanded to name the specific radionuclides, time periods of the spikes, or example fluence values used in the extrapolation to improve immediate clarity for readers.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their thoughtful review and constructive comments on our manuscript. We address each of the major comments below and have revised the manuscript to improve clarity and address the concerns raised.

read point-by-point responses

  1. Referee: [Abstract] Abstract: The estimation approach and key assumptions are outlined, but no specific models, data sources, calculations, error bars, or validation against observations are supplied. This prevents assessment of the quantitative dose values beyond the stated premises and makes the central claims difficult to evaluate for soundness.

    Authors: The abstract provides a high-level summary of the study's objectives and approach. Specific details on the radiation transport models (such as those based on Monte Carlo simulations for atmospheric propagation), the radionuclide data sources (e.g., 14C and 10Be records), the calculation procedures for dose estimates, associated uncertainties, and validation against measured doses from recent SEP events like the 2003 Halloween events are presented in the main body of the manuscript, particularly in Sections 2 (recent events) and 3 (extreme events). To facilitate easier assessment, we have revised the abstract to briefly mention the primary data sources and modeling framework used. revision: yes

  2. Referee: [Abstract] Abstract: The worst-case estimates are load-bearing on the assumption that radionuclide spikes were produced by single SEP events with particle spectra and geomagnetic conditions identical to modern observations. The manuscript should include sensitivity tests or discussion of how deviations from this assumption (e.g., multiple events or different spectra) would alter the reported doses, as this is the weakest and most consequential premise.

    Authors: We agree that the assumptions regarding single-event causation and similarity to modern spectra and geomagnetic conditions are critical and have been explicitly highlighted in the abstract and introduction as the basis for these first-order estimates. In the revised manuscript, we have added a dedicated paragraph in the discussion section analyzing the potential impacts of deviations from these assumptions. For instance, if a radionuclide spike resulted from multiple SEP events, the dose per event would be lower, reducing the worst-case radiation risk estimates. Similarly, variations in spectral hardness could lead to higher or lower doses at aviation altitudes depending on the energy range. While full quantitative sensitivity tests are challenging due to the absence of direct measurements for historical events, we provide bounding estimates based on the range of observed modern SEP spectra to illustrate the robustness of the conclusions under the stated premises. revision: partial

Circularity Check

0 steps flagged

No significant circularity; estimates are conditional extrapolations from external radionuclide data

full rationale

The paper's central results are framed as worst-case dose estimates derived from external historical radionuclide spike data, under explicit upfront assumptions that each spike arose from a single SEP event with spectra and geomagnetic conditions matching modern observations. No load-bearing step reduces by construction to a fitted parameter renamed as prediction, a self-citation chain, or an ansatz smuggled via prior work; the derivation chain consists of first-order calculations applied to independent input data rather than internal loops. This is the most common honest non-finding for papers that condition results on external benchmarks.

Axiom & Free-Parameter Ledger

2 free parameters · 2 axioms · 0 invented entities

Central estimates rest on two explicit domain assumptions about historical events and on unspecified fluence and spectrum parameters drawn from prior SEP literature; no new entities are introduced.

free parameters (2)
  • SEP event fluence
    Total particle number per event, required to scale doses but not numerically specified in abstract.
  • particle energy spectrum
    Shape of the energy distribution, assumed identical to modern events.
axioms (2)
  • domain assumption Each radionuclide spike was produced by a single SEP event
    Stated explicitly in abstract as basis for worst-case estimates.
  • domain assumption Particle spectrum and geomagnetic conditions identical to those in recent decades
    Stated explicitly in abstract as basis for worst-case estimates.

pith-pipeline@v0.9.0 · 5527 in / 1278 out tokens · 35239 ms · 2026-05-10T09:55:12.564293+00:00 · methodology

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