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REVIEW 4 major objections 4 minor 71 references

Nowcasting Solar Energetic Particle Events for Mars Missions

T0 review · 4 major / 4 minor · reviewed 2026-08-09 · deepseek-v4-flash

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Pith's one-line read A 25% rise in local dose rate can warn Mars crews of solar particle storms at least 30 minutes ahead.

desk verdict A useful operational nowcast for Mars SEPs with open data, but the 30-minute and near-zero-FAR claims need qualification before the abstract matches the analysis. read the letter →

arxiv 2502.02469 v1 pith:LPUFZQUF submitted 2025-02-04 physics.space-ph

Jan Leo Löwe , Salman Khaksarighiri , Robert F. Wimmer-Schweingruber , Donald M. Hassler , Bent Ehresmann , Jingnan Guo , Günther Reitz , Thomas Berger
show 3 more authors
Daniel Matthiä Cary Zeitlin Sven Löffner
This is my paper · ORCID
classification physics.space-ph
keywords solarenergeticparticlesnowcastingMarsradiationenvironmentMSL/RADdoserateEastronautwarningfalsealarmspaceweather
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

Solar energetic particle (SEP) storms are a serious radiation hazard for crews traveling to or living on Mars, and the existing forecast tools were built for Earth. This paper argues that a simple local warning system can serve as a reliable last resort: whenever the tissue-equivalent dose rate measured by a RAD-like detector rises 25% above its five-day background and a second consecutive measurement confirms the rise, an astronaut should head to shelter. Reconstructing 21 SEP events recorded by the MSL/RAD instrument, the authors find that for the events that matter, this trigger would have arrived at least 30 minutes before the peak dose rate and before 10% of the cumulative event dose had accumulated, while missing only minor events whose added dose is negligible. If this holds, future Mars missions can set a plain operational rule: keep within 30 minutes of shelter, and use a dosimeter threshold as the fallback alarm when forecasts fail.

What carries the argument

The load-bearing object is the dose rate E, the tissue-equivalent absorbed dose rate recorded by the plastic scintillator in the Radiation Assessment Detector, which has a large geometric factor and is insensitive to the rover's radioisotope power source. The method couples two simple components: a rolling five-day linear background fit with a fixed 25% (1.25×) trigger threshold, and a two-consecutive-measurement confirmation that suppresses false triggers from heavy-ion outliers and post-Forbush-decrease recoveries. The paper's lead time is defined retrospectively as the interval from the trigger onset to the time when 10% of the background-removed total event dose has accumulated, which is the quantity that supports the 30-minute lower limit.

What would settle it

Find or record an SEP event with a significant total dose (comparable to the ones flagged as threatening, e.g., above roughly 100 µGy background-removed) whose lead time, measured from the 25%-above-background trigger to accumulation of 10% of the total SEP dose, is less than 30 minutes; or record any two-consecutive-measurement trigger above the 25% threshold that is not followed by a real SEP event, which would break the claimed zero false-alarm rate.

Watch

Extended reading notes

Core claim

The paper's central claim is that the onset of a dangerous SEP event can be nowcast, without any solar observation, from the local dose rate alone. Using the plastic-scintillator channel (dose rate E) of MSL/RAD, the authors define the background by a linear fit to the previous five days and trigger a warning when the current 15-minute dose rate exceeds 1.25 times that background; a second consecutive measurement converts a preliminary notice into a confirmed alert. Tested against five deep-space and sixteen surface SEP events, the two-measurement version achieves a zero false-alarm rate at the 25% threshold in both environments, and the authors state that a confirmed trigger means near-certainty of an ongoing SEP event. From the distribution of lead times, they propose a universal lower bound of about 30 minutes as the time a warned astronaut has to reach shelter while still avoiding the peak dose rate and more than 90% of the total SEP dose.

Load-bearing premise

The 30-minute guarantee assumes that a real-time warning sounded the moment dose rate rises 25% above background will always come at least 30 minutes before 10% of the eventual event dose has accumulated, because the authors derive that bound from the timing of 21 past events and set aside the several historical events with shorter lead times as too minor to matter.

Editorial extensions

If this is right

  • A Mars mission can adopt an operational rule that astronauts on extravehicular activity or surface traversals remain within roughly 30 minutes of a shelter, because the nowcast is designed to give at least that much warning for dose-significant events.
  • The system runs entirely on local dosimeter data, so it works in deep space and on the surface alike and serves as a fallback whenever solar-observation-based forecasts are unavailable or fail.
  • Shelter duration can be communicated automatically: astronauts stay sheltered until the dose rate drops back below the 25% threshold, which the paper's Table 1 shows can range from about 1.5 hours to more than 3 days.
  • For the largest recorded events, the avoided dose is operationally meaningful: about 8.9 mGy for the March 2012 deep-space event and about 1.56 mGy for the May 2024 surface event, the latter being roughly 1.6 times the annual public dose limit.
  • The threshold can be lowered to 15% in deep space and 18% on Mars if the small increase in Mars false-alarm rate is accepted, or kept at 25% for a single uniform rule.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The same thresholding logic should transfer to any tissue-equivalent dosimeter with low statistical noise; the paper's own comparison of dose rates B and E shows that the method fails when the detector has poor statistics, so the practical precondition is a detector with a large geometric factor.
  • The two-measurement confirmation deliberately costs one 15-minute cadence of warning time; in a real deployment, a shorter measurement interval (e.g., one-minute data where available) could recover most of that lost time while keeping the false-alarm benefit.
  • Because the lead-time metric is defined retrospectively from the total event dose, the 30-minute guarantee is a statement about the 21 historical events; a standalone prospective test on the next solar maximum would be needed to validate it in real time.
  • The system is a nowcast, not a forecast: it cannot warn before particles arrive, so its role is complementary to solar-observatory-based predictions, and mission design should still plan shelter access time as the binding constraint.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

4 major / 4 minor

Summary. The manuscript describes a nowcasting system for solar energetic particle (SEP) events relevant to future Mars missions. The system uses the MSL/RAD dose rate E in 15-minute cadence: an event is triggered when the dose rate exceeds a five-day linear background fit by 25%. Using the 21 SEP events observed by RAD (5 during the 2011-2012 cruise, 16 on the Martian surface through September 2024), the authors compute shelter durations, times to peak, lead times (defined as the time from trigger to the accumulation of 10% of the total event dose), and total background-removed doses. They also simulate false alarm rates over the full dataset for single- and two-measurement triggers and for thresholds between 5% and 30%. The central claims are that the system can provide astronauts with at least 30 minutes to avoid the peak dose and the majority of the cumulative dose, and that it achieves a near-zero false alarm rate both in deep space and on the Martian surface.

Significance. If the claims were supported as stated, this would be a valuable, minimal-cost, last-resort warning layer for Mars missions, complementing forecast tools such as REleASE and ESPERTA that have not been validated for Mars. The strengths of the paper are real: it is built on 13 years of actual RAD flight data; the algorithm is simple and clearly specified, including a two-step confirmation logic; the false-alarm simulation is a systematic and appropriate test of the method; the negative result for dose rate B in Appendix 6 is honestly documented; the analysis data are openly provided on Zenodo; and the detector-specific scope limitation at the end of Section 5 is stated explicitly. However, the headline quantitative claims go beyond what the paper's own tables establish. The 30-minute lower bound is obtained after excluding detected events with 2-17 minute lead times; the near-zero false alarm rate requires a two-measurement confirmation that costs 15 minutes of warning time; the lead time is a retrospective quantity; and the 25% threshold is selected on the same in-sample data used to report the FAR.

major comments (4)
  1. [Abstract; Section 4, Table 1] The abstract's claim that the system 'can provide astronauts with at least 30 minutes' is not supported by Table 1 as presented. Four events that trigger the system have lead times of 17 minutes (2012-01-23), 2 minutes (2014-09-10), 5 minutes (2023-03-12), and 8 minutes (2024-09-02); the minimum among the events retained as prioritized is 33 minutes (2024-09-05 on the surface, with 35 minutes for 2012-03-13 in deep space). Section 4 excludes the four short-lead-time events as 'not prioritized' because of negligible dose, but the exclusion is not applied consistently by the tabulated doses: the excluded 2012-01-23 event has a total SEP dose of 12.71 µGy, which is larger than the retained 2013-04-10 event (9.22 µGy). The universal statement in Section 4 ('an astronaut should not move more than 30 minutes away from a shelter') is therefore obtained by removing the counterexamples, and it should be reformulated as conditional on a stated minimum event dose, or replaced by the empirical distribution of lead times.
  2. [Section 3, Figure 3 (right); Section 4] The lead time used in Table 1 and in the 30-minute claim is defined retrospectively: it is the interval from the 25%-threshold crossing to the time at which 10% of the event's final total SEP dose has accumulated. Because the final total is known only after the event has ended, a real-time system cannot know, at the moment of triggering, how much lead time a given event will provide. The sentence in Section 4 ('to propose a universal lower limit... we therefore assume the minimum lead time, which is approximately 30 minutes') is thus an empirical property of the selected historical events, not an operational guarantee, unless the manuscript states and defends an additional assumption about future dose-accumulation rates. The wording should distinguish the retrospective characterization of historical events from a forward-looking warning guarantee.
  3. [Section 4.1, Figure 4; Abstract; Section 5] The abstract's conjunction of 'at least 30 minutes' with 'near-zero false alarm rate' is internally inconsistent with the paper's own results. Figure 4 shows that with a single measurement at the 25% threshold the FAR is 25% on the Martian surface and zero in deep space; the zero FAR in both environments is reached only with the two-measurement confirmation, which the text states sacrifices 15 minutes of warning time. Subtracting 15 minutes from the tabulated lead times, the shortest retained surface lead time (2024-09-05, 33 minutes) becomes 18 minutes, and the shortest retained deep-space lead time (2012-03-13, 35 minutes) becomes 20 minutes, both below 30 minutes. The abstract and the Summary should state explicitly which claim belongs to which warning mode: the 30-minute lead time belongs to the immediate single-measurement notification (25% surface FAR), while the near-zero FAR belongs to the official alert delivered 15 minutes later.
  4. [Section 4.1, Figure 4] The near-zero FAR result is selected in-sample. The section scans trigger thresholds from 5% to 30% on the same 21-event dataset used to report the performance, and the uniform 25% threshold is justified by the FAR values obtained in that scan. With only 5 deep-space and 16 surface events, a zero-FAR outcome carries a wide binomial confidence interval; the error bars in Figure 4 acknowledge the statistical uncertainty, but the abstract's unqualified 'near-zero false alarm rate' should be presented as an in-sample property of this dataset with the small-sample caveat stated explicitly.
minor comments (4)
  1. [Table 4] Event identifications are inconsistent across tables: '2014-08-31' in Table 4 corresponds to '2014-09-02' in Table 1; the event described in the text as May 19, 2024 appears as 2024-05-20 in Table 1 and as 2023-05-19 in Table 4; and events dated 2024-10-05 and 2024-10-09 appear in Tables 3 and 4 but are absent from Table 1.
  2. [Section 4] The observation 'it can be observed that time to peak ≳ lead time' is violated by the largest surface event, 2024-05-20, which has a time to peak of 0h53m and a lead time of 0h57m; the sentence should be qualified.
  3. [Section 1; References] The citation for astronaut career dose limits appears in the text as '(?, ?)', and the reference list includes 'HandWiki' (a wiki) and 'Richardson et al., n.d.'; these are not acceptable as final references for a journal submission.
  4. [Section 3, Figure 3] The caption of Figure 3 and the surrounding text define lead time as 'the period in which an astronaut can avoid at least 90% of the total SEP dose'; this definition should state explicitly that the interval is measured from the 25%-threshold crossing, not from the physical onset of the event, so that the distinction is not left to the reader.

Circularity Check

3 steps flagged · score 6.0 of 10

The 'near-zero FAR' and 'at least 30 minutes' claims are in-sample, definitional summaries rather than independent predictions: the trigger threshold is tuned on the same events, lead time is defined from the event-final dose, and the 30-minute bound is the sample minimum after excluding short-lead events.

  1. fitted input called prediction [Section 4.1 (False Alarm Rate), Figure 4 and following paragraphs]
    "In addition to the 25% above background threshold used in this study, we also test trigger thresholds ranging from 5% to 30% above background to determine the optimal threshold for nowcasting. ... At this threshold, our nowcasting system achieves a zero FAR in both deep space and on the Martian surface under the cross-checking assumption."

    The threshold is selected by scanning the false-alarm rate over 5%-30% on the same 21-event dataset that is then used to report performance. The zero FAR at 25% is therefore an in-sample selection outcome, not an out-of-sample predictive result. The paper's headline 'near-zero false alarm rate' is a property of the threshold that was chosen to have that property on this dataset; no held-out events or prospective test are used.

  2. self definitional [Section 3 (Methodology, Figure 3 right) and Section 4 (Table 1, lead time results)]
    "The lead time is defined as the period in which an astronaut can avoid at least 90% of the total SEP dose (time region marked in red) and would receive only 10% of the total SEP dose (time region marked in orange)."

    The total SEP dose is the accumulated dose over the whole event, which is only known after the event ends. The tabulated 'lead time' is the time from trigger until 10% of that final total is accumulated, so the 30-minute warning values are retrospective quantities computed with knowledge of the event's complete dose profile. Calling this 'the time an astronaut has' turns a post-hoc integration result into a real-time warning horizon; the claimed warning time is built from the final event total by definition.

1 more flagged steps
  1. other [Section 4, paragraphs after Table 1 ('To propose a universal lower limit...')]
    "However, these SEP events also result in negligible additional radiation exposure above the GCR background, as indicated in the total SEP dose in Table 1. ... Therefore, these SEP events are also not prioritized events that require specific avoidance. ... To propose a universal lower limit for the time an astronaut has to reach shelter, we therefore assume the minimum lead time, which is approximately 30 minutes."

    The 'universal lower limit' is literally the minimum of the observed lead times in the retained sample, and the retained sample is obtained by excluding triggered events with 17, 2, 5 and 8 minute lead times (2012-01-23, 2014-09-10, 2023-03-12, 2024-09-02). The abstract's 'at least 30 minutes' is thus the sample minimum renamed as a guarantee, not a validated bound. The paper's own two-measurement confirmation later 'sacrifices' 15 minutes, which would move even the shortest retained lead time (33 min for 2024-09-05) below the advertised 30 minutes.

full rationale

The paper is largely transparent about its algorithm and uses publicly archived MSL/RAD data; the background fit, 25% trigger, and event tables can be re-computed independently, and the citations to prior RAD work are data/context references, not a load-bearing self-citation chain. However, the two headline performance claims do not come from an independent prediction. First, Section 4.1 tunes the trigger threshold by measuring FAR on the same events that are then used to report near-zero FAR, so that number is a selected, in-sample property. Second, the lead time is defined retrospectively from the event-final total SEP dose, so the 'warning time' values in Table 1 are not available in real time at the moment of trigger. Third, the 'at least 30 minutes' universal lower limit is the minimum of the retained historical lead times after explicitly excluding four events that did trigger the system with 2-17 minute lead times, and the 15-minute cost of the two-measurement confirmation is not subtracted from the quoted values. These are not external validations; the central claims partially reduce to the thresholds, exclusions, and retrospective definitions chosen by the authors. Score 6 reflects partial circularity: the system concept is independently implementable, but the headline numbers are by-construction summaries of the same fitting/evaluation dataset.

Assumptions & free parameters 4 free parameters · 4 assumptions · 0 invented entities

The central claim rests on four free design choices (threshold, background window, lead-time dose fraction, confirmation rule) and on the domain assumptions that the five-day background is stable, the external event labels are correct, MSL/RAD dose rate E represents future astronaut dosimeters, and weak events can be excluded from the warning-time guarantee. The threshold and event exclusions are the largest contributors: both are chosen by inspecting the same data used to evaluate the system.

free parameters (4)
  • SEP trigger threshold = 25% above 5-day background
    Section 4.1: authors scanned 5-30% and selected 25% as uniform threshold giving zero FAR under two-measurement confirmation; single-measurement surface FAR is 25% at this threshold.
  • Background fit window = 5 days
    Section 3: linear fit over five days preceding each event; no sensitivity analysis for this window length.
  • Lead-time dose fraction = 90% of total SEP dose
    Section 3 and Figure 3: lead time is defined as time to avoid at least 90% of total SEP dose; the 80% and 50% thresholds in Appendix 8 are also explored, so the 90% choice is a modeling decision.
  • Confirmation rule = two consecutive 15-minute measurements
    Section 4.1: two-measurement cross-check reduces surface FAR to 0% at 25% threshold but adds 15 minutes latency; trade-off vs. short lead-time events is not quantified.
assumptions (4)
  • domain assumption The GCR background is constant over a five-day window; seasonal, solar modulation, and 27-day rotation effects are negligible.
    Section 3: 'Seasonal changes in atmospheric column depth, solar modulation effects, and the Sun's ~26-day heliospheric rotations are considered negligible over a five-day period.'
  • domain assumption The external SEP event list used as ground truth is complete and correct.
    Section 4: events are identified through proton flux studies (Ehresmann et al. 2018) and magnetically connected spacecraft (Guo et al. 2023), then used to define triggers and lead times.
  • domain assumption Dose rate E from MSL/RAD represents what a future astronaut dosimeter would measure.
    Section 5 caveat: 'the presented results are valid for the statistics of the MSL/RAD plastic scintillator detector... For a future Mars mission, it is recommended that astronauts carry a nowcasting system similar to MSL/RAD.'
  • ad hoc to paper Events below the 25% threshold or with very short lead times can be classified as not relevant to nowcasting.
    Section 4: four below-threshold surface events are declared 'not relevant in the context of nowcasting,' and weak events with 2-17 minute lead times are declared 'not prioritized events that require specific avoidance' before deriving the 30-minute limit.

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Cite this review

Pith. "Pith review of Nowcasting Solar Energetic Particle Events for Mars Missions." pith.science (2026). https://pith.science/paper/LPUFZQUF

@misc{pith2026250202469,
  author       = {Pith},
  title        = {Pith review of: Nowcasting Solar Energetic Particle Events for Mars Missions},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/LPUFZQUF}},
  note         = {Machine review of arXiv:2502.02469}
}
read the original abstract

In addition to the omnipresent Galactic Cosmic Rays (GCRs), sudden solar energetic particle (SEP) events present considerable health hazards for manned space missions. These events not only contribute to an increased long-term cancer risk, but can, in extreme cases, cause acute radiation syndromes. Forecasting their imminent occurrence could significantly reduce radiation exposure by warning astronauts to move to shelter. However, all currently available tools are primarily designed for the Earth or Earth-Moon system, which limits their applicability to future Mars missions. To address this, we developed a nowcasting system for SEP events applicable in deep space and on the Martian surface, which serves as a reliable last-resort backup when forecasts fail. The methodology of this system is based on dose rates measured by the Radiation Assessment Detector (RAD) onboard the Mars Science Laboratory (MSL), which recorded 5 SEP events during the seven-month flight to Mars and 16 since its landing on Mars on August 6, 2012. An SEP event is triggered, and an astronaut is warned as soon as dose rates exceed the omnipresent background level by at least 25%. This approach suggests that our system can provide astronauts with at least 30 minutes to avoid both peak radiation exposure and the majority of the cumulative dose from SEP events. Our nowcasting system is robust, easily implementable in real-life scenarios, and achieves a near-zero false alarm rate both in deep space and on the Martian surface.

Figures

Figures reproduced from arXiv: 2502.02469 by the authors.

Figure 1
Figure 1. Schematic view of RAD. RSH houses three silicon detectors (A, B, C) alongside a caesium iodide scintillator (D) and a plastic scintillator (E). Both scintillators are encased in a plastic anticoincidence shield (F1, F2). The two different FOVs for charge particle and LET measurements are A2×B = 36° and A×B = 60°. The Radiation Assessment Detector (RAD; (Hassler et al., 2012)) is installed on the Mars Science Labora￾… view at source ↗
Figure 2
Figure 2. Dose rate measured by the MSL/RAD plastic scintillator detector E in deep space since the launch on November 26, 2011, during the seven-month flight to Mars (left) and on the Martian surface from landing on August 6, 2012, to September 9, 2024 (right). Detected SEP events are indicated by red arrows. To establish a consistent definition of when astronauts need to go to shelter, it is first necessary to characterize … view at source ↗
Figure 3
Figure 3. Definitions of the parameters that a nowcasting system must provide an astronaut, exemplified by the SEP event observed by MSL/RAD on the surface of Mars on February 15, 2022. The left panel shows the dose rate E as a function of time, with the fitted background and the 25% trigger threshold marked as horizontal dashed lines. The color-shaded area indicates the SEP event. The shelter duration is the time from onset … view at source ↗
Figures from the paper (6 more)
Figure 4
Figure 4. Figure 4: False alarm rates in deep space (red) and on the Martian surface (black) for our nowcasting system, depending on differ￾ent SEP trigger thresholds. Solid lines represent warnings triggered as soon as a single 15-minute dose rate E measurement exceeds the respective thr…
Figure 5
Figure 5. Figure 5: Summary plot of the shelter duration (black), time to peak (red) and lead time (blue) for all SEP events detected by MSL/RAD in deep space (left) and on the Martian surface (right). In order to further improve our nowcasting system, it is proposed to lower the trigger …
Figure 6
Figure 6. Figure 6: The dose rate B measured by the MSL/RAD in deep space since the launch on November 26, 2011, during the seven￾month flight to Mars (left) and on the Martian surface from landing on August 6, 2012, to September 9, 2024 (right). Detected SEP events are indicated by red a…
Figure 7
Figure 7. Figure 7: Analysis of the temperature impact on dose rate B for the period from April 10, 2022, to May 5, 2022. On the left, dose rate B and the internal MSL/RAD temperature are plotted versus time. Temperature ranges exceeding 36.96°C are marked in blue and precisely overlap wi…
Figure 8
Figure 8. Figure 8: Similar to the study and representation of the FAR in the main paper, but using dose rate B. The error bars are omitted for clarity. –12– [PITH_FULL_IMAGE:figures/full_fig_p012_8.png]
Figure 9
Figure 9. Figure 9: Dose rate E plotted versus time. The main plot shows the entire SEP event on February 25, 2022, while the subplot pro￾vides a zoomed-in view of the high-resolution dose rate E from the onset to the peak of the event. The black dashed line represents the fitted backgrou…

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Pith tools

Reviewed August 9, 2026 · model on record in the stance chip above.