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REVIEW 3 major objections 6 minor 54 references

The impacts of tropospheric gravity wave-generated MSTIDs on skywaves at middle latitude North American sector observed and modeled using SuperDARN HF radars

T0 review · 3 major / 6 minor · reviewed 2026-08-06 · deepseek-v4-flash

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Pith's one-line read The paper shows that thunderstorm-driven MSTIDs shift SuperDARN ground-scatter skip distances and, in ray tracing, create low-elevation Pedersen-mode ducts along the F-region peak.

desk verdict An honest event study tracing thunderstorm GWs to HF ground-scatter changes, with a new model-based Pedersen-ducting result; the agreement is qualitative and the F-region state is unvalidated, but it deserves a serious referee. read the letter →

arxiv 2506.23984 v1 pith:FN2DC77Z submitted 2025-06-30 physics.space-ph physics.plasm-ph

S. Chakraborty , P.A. Inchin , S. Debchoudhury , C. Heale , B. Bergsson , M. Zettergren , J. M. Ruohoniemi This is my paper · ORCID
classification physics.space-phphysics.plasm-ph
keywords gravitywavesMSTIDHFpropagationSuperDARNPedersenmodeionosphericductingraytracingthunderstorm-drivendisturbances
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

This paper argues that medium-scale traveling ionospheric disturbances (MSTIDs) produced by thunderstorm-generated gravity waves can significantly alter high-frequency (HF) radio propagation, and that a coupled model chain can reproduce the radar signatures of those alterations. Using daytime ground-scatter returns from the SuperDARN Fort Hays radars on 27 May 2017, the authors show the skip distance—the first range at which ground returns appear—moves toward and away from the radar as MSTID phase fronts pass through the beam. Ray tracing through a modeled thunderstorm-perturbed ionosphere reproduces this back-and-forth motion, and further shows that the MSTID's density structure can act as a plasma waveguide: rays at 21–23 degrees elevation glide along the F-region peak as long-ducting Pedersen modes, whereas a control ionosphere without the disturbance produces no such ducting. If correct, this means convective weather can create unexpected long-range HF ducts and disrupt the usual relationship between elevation angle and skip distance.

What carries the argument

The load-bearing mechanism is the MSTID's plasma-density structure: gravity-wave-driven compression and rarefaction of F-region electron density traces alternating regions of low and high refractive index along the ray path. Ray tracing through these structures bends rays toward the F-region peak (hmF2), shifting the ground-scatter skip distance as the phase fronts move and, at certain elevation angles, trapping rays into a gliding trajectory that follows the peak—a Pedersen mode. The machinery that produces this result is the coupled chain: the MAGIC atmospheric model, driven by NEXRAD precipitation-derived latent heating, feeds neutral density, temperature, and wind perturbations to the GEMINI ionospheric model, whose electron-density output is passed to the PHaRLAP 2D ray tracer. MSTIDs are medium-scale traveling ionospheric disturbances—wave-like density ripples with periods of 15–60 minutes and horizontal wavelengths of hundreds of kilometers—and Pedersen rays are those that glide along the F-region maximum with divergent paths, normally confined to a narrow elevation-angle window. The skip-distance comparison, rather than absolute power, is the observable that carries the data–model agreement.

What would settle it

Take a daytime MSTID event with concurrent SuperDARN ground scatter and a direct electron-density measurement along the radar beam (an ionosonde or incoherent-scatter radar at the same location and time), run the same 2D ray tracer through the measured density field, and check whether the observed skip-distance back-and-forth motion is reproduced and whether low-elevation ducting appears only in the disturbed run; if the measured-density rays do not reproduce the motion, or if the control still ducts, the simulated waveguide is an artifact of the model rather than the real propagation effect.

Watch

Extended reading notes

Core claim

The central claim is that MSTIDs generated by tropospheric thunderstorms can be detected in SuperDARN ground-scatter data and that, in the model at least, their alternating density compressions and rarefactions near the F2 peak create the refractive conditions for long-ducting Pedersen-mode propagation at lower elevation angles than a quiet ionosphere would allow. The paper's evidence chain runs from NEXRAD-based latent-heating forcing of a gravity-wave model, through a coupled ionospheric plasma simulation, to 2D HF ray tracing along beam 11 of the Fort Hays East radar at 11.5 MHz. The simulated ground-scatter skip distance moves back and forth in step with MSTID phase fronts, matching the observed motion of the daytime ground-scatter population; in the perturbed ionosphere, rays launched between 21.7 and 22.9 degrees include a channel near 21.8 degrees that glides along the F-region peak over more than 250 km, while an otherwise identical control simulation shows no ducting. The paper does not claim to have observed these Pedersen modes in the radar data; it claims the model shows MSTIDs can create such waveguides.

Load-bearing premise

The argument rests on the simulated F-region electron density along the radar beam being realistic enough that the ray paths genuinely represent what the radar saw, even though that density is not directly checked against measurements and only the two-dimensional slice of it is traced.

Editorial extensions

If this is right

  • The skip distance of daytime HF ground scatter is a usable, quantitative tracer for MSTID phase fronts, so SuperDARN-type radars can monitor convective gravity-wave impacts without needing absolute backscattered power calibration.
  • MSTID-perturbed ionospheres can support long-ducting Pedersen modes at elevation angles (roughly 21–23 degrees at 11.5 MHz) where a quiet ionosphere produces no such propagation, implying extra, low-elevation HF paths during stormy daytime conditions.
  • Thunderstorm-driven gravity waves join auroral, magnetospheric, and volcanic sources as a demonstrated cause of MSTID-related HF propagation disruption.
  • Because the ducting is tied to the F2-peak density structure, path availability and skip distance during MSTID events will depend on where the phase fronts sit relative to the radar beam, producing the observed back-and-forth and intensification/lessening signatures.
  • The coupled model chain offers a way to test how other convective sources would affect HF links, since it reproduces the observed MSTID signatures qualitatively.

Reading between the lines

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

  • If low-elevation Pedersen ducts form as often as these conditions suggest, HF over-the-horizon radar and communication systems could experience systematic coverage extensions and holes correlated with thunderstorm activity; the paper does not quantify occurrence rates, but the mechanism points to that test.
  • The 2D ray tracing leaves horizontal density gradients across the beam unmodeled; an inference is that the real ducting strength depends on the MSTID tilt out of the ray plane, so 3D tracing may find either stronger, more persistent ducts or narrower ones.
  • A targeted archive search of daytime SuperDARN events with concurrent GNSS TEC MSTID detections could look for ground-scatter returns appearing at slant ranges and elevation angles below the usual quiet-time Pedersen window, providing an observational test the paper's case study could not.
  • The waveguide mechanism likely generalizes to any MSTID that structures the F-region peak, so eruption- or aurora-driven disturbances may produce similar low-elevation ducts even though this paper studies a thunderstorm source.
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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

3 major / 6 minor

Summary. This manuscript investigates how tropospheric thunderstorm-generated gravity waves (GWs), which create medium-scale traveling ionospheric disturbances (MSTIDs), affect HF skywave propagation. Observations from the SuperDARN Fort Hays East radar on 27 May 2017 show ground-scatter skip-distance motion and power variations attributed to MSTIDs. The authors model the event with the MAGIC atmosphere model (forced by NEXRAD precipitation) coupled to the GEMINI ionospheric model, and then use 2D PHaRLAP ray tracing to simulate the radar's beam 11 at 11.5 MHz. They report qualitative agreement between observed and simulated ground-scatter patterns (Figures 6-7) and, in the perturbed ionosphere but not in a no-GW control run, find long-ducting Pedersen modes at lower elevation angles (21-23 degrees), which they interpret as MSTID-induced plasma waveguides.

Significance. The end-to-end modeling chain from tropospheric convection to HF propagation signatures is a valuable contribution, and the observational documentation of skip-distance motion during a thunderstorm-driven MSTID event is a useful case study. The control run is a well-designed experiment that supports the internal consistency of the Pedersen-mode claim within the model. However, the headline data-model agreement is supported only by feature-based, qualitative comparison, and the simulated F-region densities that drive the ray tracing are not validated within this manuscript. These gaps currently limit the strength of the conclusions, though they are addressable through added validation or sensitivity analysis.

major comments (3)
  1. [Sections 2.2 and 4] The ray-tracing results and the 'great qualitative agreement' claim depend on the MAGIC+GEMINI electron density along beam 11, but this manuscript provides no direct validation of that density (e.g., NmF2, hmF2, or MSTID amplitude/phase) along the ray path. The model description is deferred to Inchin et al. (JGR, in review, 2025), which is not in the reference list, and Section 4's validation statement is incomplete: 'validated against GNSS vTEC and COSMIC-2 radio occultation observations and presented in )' contains a placeholder rather than a citation. Because a biased background density or an incorrect MSTID structure could displace the skip distance in a way similar to the observations, the authors should either include the validation data (or the companion paper's key results) and add sensitivity tests that scale NmF2 and hmF2, or temper the 'great' agreement claim accordingly.
  2. [Section 3.1, Figures 6-7] The data-model comparison is explicitly qualitative; the text states that regression analysis is not possible because the modeled power is relative. Yet the abstract and Section 3.1 describe 'great qualitative agreement.' To make this claim assessable, the authors should provide a quantitative feature-based metric for the skip-distance motion, for example a time series of observed and simulated skip distance (such as the green/magenta curves in Figures 6-7) with a correlation coefficient or RMS difference, and report the amplitude and phase of the back-and-forth motion.
  3. [Section 3.2, Figures 8-9] The Pedersen-ducting result is obtained with the 2D PHaRLAP module (Section 2.2.1), so horizontal density gradients and tilts across the beam are neglected. The conclusion that 'MSTID can create a plasma waveguide' thus depends on the in-plane MSTID structure being realistic; cross-beam structure could destroy or shift the duct. At minimum, the authors should run 3D ray tracing for the key rays in Figure 8 or perform a sensitivity test with rays at adjacent azimuths, and report whether the 21-23 degree ducting persists.
minor comments (6)
  1. [Section 3.2] The text refers to 'Figure 7' for the narrow-elevation-angle ray comparison and states 'Panel A of Figure 7 shows a zoomed-in view of the three rays,' but this content is in Figure 8; Figure 7 shows the modeled FoV scans. Please correct the cross-reference.
  2. [Figure 2(B)] The caption identifies the example FoV as from the SuperDARN Blackstone radar, while the text in Section 2.1 says the example is from Fort Hays East; please confirm which radar is shown and align caption and text.
  3. [Figure 3] The caption lists panels (A–E), but the text describes six panels (A)–(F); also the caption mentions a green curve while the text refers to black and magenta skip-distance curves; please make the panel count and curve colors consistent.
  4. [Figure 9 Panel C] The caption states an elevation angle of 22.8°, but the text in Section 3.2 cites 22.7°; please reconcile.
  5. [Section 5 (Open Research)] The Zenodo availability statement contains placeholders '(?, ?)' rather than an actual DOI; please provide the accession link.
  6. [Abstract and Plain Language Summary] The abstract and plain language summary could be more explicit that the Pedersen-mode result is a modeling prediction, not an observed phenomenon, since Section 3.2 states no Pedersen modes were detected in the radar data; consider rephrasing 'suggesting MSTID can create a plasma waveguide' to attribute the suggestion to the simulations.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the SuperDARN comparison is an independent test of a first-principles model chain.

full rationale

The paper's derivation chain is not circular. The MAGIC gravity-wave simulation is forced by NEXRAD precipitation and empirical atmosphere models (NRLMSISE-00, MERRA-2, HWM-14), not by the SuperDARN data used for comparison; GEMINI is driven by MAGIC outputs; and PHaRLAP ray tracing through the resulting ionosphere produces ground-scatter skip distances that are then compared with radar observations. No parameter is fitted to the SuperDARN measurements, and the simulated backscatter power is obtained from ray counts weighted by geometry rather than by matching the observed power. The only self-referential element is the deferral of MAGIC/GEMINI specification and ionosphere validation to a companion paper by overlapping authors (Inchin et al., JGR, in review, 2025), but that validation is against external GNSS vTEC and COSMIC-2 data, so it is independent evidence rather than a self-citation that forces the result. The absence of that reference from the reference list and the missing citation placeholders in Section 4 are completeness and correctness issues, not circularity. The Pedersen-ducting claim is acknowledged by the authors to be unsupported by direct observation ('no observational evidence of Pedersen modes was detected by the Fort Hays radars in this particular case'), which is an honest limitation, not a circular prediction. The qualitative nature of the data-model comparison and the lack of direct F-region density validation along beam 11 affect evidential strength but do not make the comparison equivalent to its inputs.

Assumptions & free parameters 1 free parameters · 6 assumptions · 0 invented entities

No free parameters are fitted to the SuperDARN data, so the circularity burden is low. The main unverified inputs are the source representation, the background atmosphere, the unpublished ionosphere validation, and the 2D ray-tracing restriction. No new physical entities are postulated; the plasma waveguide is an emergent structure in an existing model.

free parameters (1)
  • Backscattered power weighting exponent = 3
    Section 2.2.2 weights modeled ground-scatter ray counts by 1/r^3, assuming target size grows linearly with range. It is a hand-chosen modeling constant affecting simulated power distributions, not the ray paths.
assumptions (6)
  • domain assumption NEXRAD precipitation-derived latent heating represents the actual gravity-wave source of the 27 May 2017 thunderstorm.
    Section 2.2 uses latent heating profiles from NEXRAD digital precipitation rate as MAGIC's GW source; the fidelity of this source representation is not directly verified in this paper.
  • ad hoc to paper The MAGIC+GEMINI ionosphere along beam 11 is accurate enough for ray-tracing comparison.
    Section 4 defers validation to Inchin et al. (JGR, in review), a reference not present in the list, and no in-beam electron density comparison is shown.
  • domain assumption Two-dimensional ray tracing captures the propagation relevant to this event.
    Section 2.2.1 states the 2D PHaRLAP module is used, so horizontal gradients and off-beam tilts are neglected; SuperDARN beams span a finite azimuthal width.
  • domain assumption Empirical atmosphere and wind models (NRLMSISE-00, HWM-14, MERRA-2) provide a realistic background state.
    Sections 2.2 and 2.2.1 use these models for neutral densities, temperature, and winds; errors in the background state propagate into MSTID and ray-path structure.
  • domain assumption Ground scatter can be modeled as ray counts in 45 km range bins with 1/r^3 weighting and no terrain reflectivity.
    Section 2.2.2 states terrain geometry and reflective properties are not included, so the simulated power is a relative proxy.
  • standard math PHaRLAP ray tracing implements standard Haselgrove and Coleman magnetoionic ray equations correctly.
    Section 2.2.1 relies on these established equations for ray paths; no independent numerical verification is provided in the paper.

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Cite this review

Pith. "Pith review of The impacts of tropospheric gravity wave-generated MSTIDs on skywaves at middle latitude North American sector observed and modeled using SuperDARN HF radars." pith.science (2026). https://pith.science/paper/FN2DC77Z

@misc{pith2026250623984,
  author       = {Pith},
  title        = {Pith review of: The impacts of tropospheric gravity wave-generated MSTIDs on skywaves at middle latitude North American sector observed and modeled using SuperDARN HF radars},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/FN2DC77Z}},
  note         = {Machine review of arXiv:2506.23984}
}
read the original abstract

Trans-ionospheric high frequency (HF: 3-30 MHz) response to gravity waves (GWs) is studied in the middle-latitude ionosphere in relation to thunderstorm activity. SuperDARN HF radar observations are compared against the model simulations to quantify the impact of GW-generated MSTID (medium-scale traveling ionospheric disturbances) activity on the skywaves traveling through ionospheric F-region heights. The tropospheric thunderstorm-driven convective source is modeled using MAGIC. The outputs are coupled with GEMINI to model ionospheric plasma response, which is then used to model SuperDARN HF radar observations using the PHaRLAP raytracing tool. Semi-concentric GWs were observed at different atmospheric heights, creating MSTIDs at F-region heights. PHaRLAP raytracing through the modeled ionosphere shows great qualitative agreement with SuperDARN daytime ground scatter observations. Modeled rays show possibilities of long ducting Pedersen rays, suggesting MSTID can create a plasma waveguide to duct rays at the F-region height.

Figures

Figures reproduced from arXiv: 2506.23984 by the authors.

Figure 1
Figure 1. Field-of-views (FoVs) of the SuperDARN Fort Hays East (in blue) and West (in red) radars (up to 50 range gates) located at middle latitude used in this study. Beams 3 and 11 of FHE radar are indicated by the colored contours and beam numbers mentioned at the end of the FOV in blue. –14– [PITH_FULL_IMAGE:figures/full_fig_p014_1.png] view at source ↗
Figure 2
Figure 2. (A) Schematic representation of SuperDARN radar ray paths illustrating ground scatter and ionospheric scatter. Illustration of 1/2-hop F-region, 1-hop E-region, and 1-hop F￾region propagation geometries. The black squares indicate ground backscatter locations. (B) Field-of-view scan from the SuperDARN Blackstone radar, displaying line-of-sight backscatter returned power measurements taken on May 27, 2017, at 19:30 U… view at source ↗
Figure 3
Figure 3. Fields-of-View (FOV) scan plots from the SuperDARN Fort Hays radars (FHE and FHW) during GW-generated MSTIDs on May 27, 2017: Panels (A–E) present a series of FOV scan plots depicting backscattered power, color-coded according to the scale shown in the bottom-left corner. Beams 3 and 11 of the FHE radar are highlighted with colored contours within the larger FOV outlines and are also labeled in blue text. The green … view at source ↗
Figures from the paper (6 more)
Figure 4
Figure 4. Figure 4: Observations from the SuperDARN Fort Hays East radars along beams (A) 11 and (B) 03: Range-Time-Intensity (RTI) plots of the backscattered power showing HF response to ionospheric MSTIDs on May 27, 2017, color coded by the color bar on the right. The green curves in bo…
Figure 5
Figure 5. Figure 5: PHaRLAP Raytracing Through MSTID-Modified (MAGIC+GEMINI) Ionosphere on May 27, 2017: Simulated rays from the SuperDARN Fort Hays East (FHE) radar along beam 11 are shown with elevation angles ranging from 18◦ to 30◦ at four time instances: (A) 17:30 UT, (B) 18:15 UT, (…
Figure 6
Figure 6. Figure 6: Range-Time-Intensity (RTI) plots are presented, comparing (A) observed and (B) simulated ground scatter from the SuperDARN FHE radar (beam 11). These plots illustrate a data-model comparison highlighting the impact of MSTIDs on the radar-observed ground scatter charact…
Figure 7
Figure 7. Figure 7: Fields-of-view (FoV) scan plots of the backscattered from the SuperDARN FHE radar simulated using MAGIC+GEMINI and raytraced using PHaRLAP. Panels (A-E) present a series of FOV scan plots depicting relative backscattered power, color-coded according to the scale shown …
Figure 8
Figure 8. Figure 8: PHaRLAP raytracing through (A) MSTID-modified, and (B) controlled iono￾sphere showing impact of MSTIDs on long-ducting HF modes. Simulated rays from the Super￾DARN Fort Hays East (FHE) radar along beam 11 are shown with elevation angles ranging from 21.7◦ to 22.9◦ at 1…
Figure 9
Figure 9. Figure 9: The figure illustrates the simulated distribution of refractive index (η) as a function of slant range and elevation angle at 19:00 UT along beam 11 of the FHE radar operating at 11.5 MHz. Panels (A) and (B) compare propagation through an MSTID-modified ionosphere and …

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Pith tools

Reviewed August 6, 2026 · model on record in the stance chip above.