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Open research questions in Solar and Space Plasma Dynamics

393 gap statements mined from Solar and Space Plasma Dynamics papers in our 7.9M-paper local library, which holds 2,144 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • Prior work has focused on the detection of waves, but the detection of resonant nodes is crucial for understanding the dynamics of the solar chromosphere. The paper aims to fill this gap by detecting and characterizing resonant nodes.

    Detection of resonant nodes in a pore chromosphere · 2026 · DOI

  • The study notes that prior work has not fully addressed the correlation between these two parameters.

    Correlation of Diffusion Upstream of Shocks with Their Magnetic Compression: An Application of IMAP’s Living Catalog of Interplanetary Shocks · 2026 · DOI

  • The need to resolve the small-scale structures in the simulations. The challenge of interpreting the results of the simulations in the context of the larger-scale coronal dynamics.

    Current Sheet Fragmentation in the Course of Repeated Eruptive Magnetic Flux Emergence · 2026 · DOI

  • The study uses 3D resistive-MHD simulations, which may not fully capture the complexity of the real system. The simulation is limited to a 144-minute duration. The study focuses on the strong current structures that arise within closed magnetic topologies.

    Current Sheet Fragmentation in the Course of Repeated Eruptive Magnetic Flux Emergence · 2026 · DOI

  • Internal velocity distributions of CMEs are not well understood. Traditional methods have not been able to accurately capture the complex internal flows of CMEs.

    CME Kinematics with Optical Flow: Multicoronagraph Insights into Internal Velocity Dispersion · 2026 · DOI

  • The mechanisms of particle acceleration in solar flares are not well understood. The role of turbulent reconnection in accelerating electrons is not well studied.

    Electron Acceleration by Turbulent Reconnection in Solar Flares · 2026 · DOI

  • The lack of a comprehensive catalogue of QPPs in X-class solar flares. The need for a uniform procedure to detect and study QPPs. The limited understanding of the properties and characteristics of QPPs in X-class solar flares.

    Hard X-Ray Quasiperiodic Pulsations in X-class Solar Flares Observed by Aditya-L1/HEL1OS · 2026 · DOI

  • Further research is needed to improve the realism and accuracy of solar flare simulations. The study of nonlocal thermal transport at MHD scales should be continued. The effects of different thermal conduction models on the temperature evolution and chromospheric evaporation should be further investigated.

    The Role of Nonlocal Thermal Transport in Flare-driven Chromospheric Evaporation · 2026 · DOI

  • The classical local model of thermal transport is insufficient for describing nonlocal thermal transport in solar flares. The paper identifies a gap in the current understanding of thermal transport in solar flares, which can be addressed by using nonlocal thermal conduction models.

    The Role of Nonlocal Thermal Transport in Flare-driven Chromospheric Evaporation · 2026 · DOI

  • The origin of the organization of periodic density structures remains uncertain. The paper identifies a gap in understanding how MHD responses can modulate density or release rate. The paper notes that the observed PDS frequency range is broad and requires a more detailed understanding of the underlying mechanisms.

    Can MHD Oscillations Modulate Quasi-periodic Plasma Release from Coronal Streamers? · 2026 · DOI

  • The limited FOV of the SO/PHI-HRT observations. The need to resolve the azimuthal ambiguity of the transverse magnetic field. The challenge of constructing an extended and approximately flux-balanced boundary for coronal magnetic field extrapolation.

    Connectivity rewiring and filament formation by active region emergence observed with Solar Orbiter · 2026 · DOI

  • Prior to the launch of Solar Orbiter, in situ measurements of heavy ion charge state were limited to distances of 1 au and beyond. There is a need for a proxy that can be used to identify the solar wind source region in the absence of in situ charge state measurements.

    Proton Specific Entropy as a Proxy for the O 7+ /O 6+ Charge State Ratio over Heliocentric Distance · 2026 · DOI

  • The properties and contribution of circumfacular regions to solar activity diagnostics remain poorly understood. There is a need for a systematic study of the photometric and geometric properties of circumfacular regions. The temporal evolution of circumfacular regions and their relationship with other solar features is not well understood.

    Properties of Circumfacular Regions Derived from H α and Ca ii K Synoptic Observations of the Sun · 2026 · DOI

  • Coronal mass ejections (CMEs) are major drivers of space weather, yet their thermodynamic evolution remains insufficiently constrained.

    Kinematics and Thermodynamics of Coronal Mass Ejections · 2026

  • There is a need for a deep-learning approach to infer solar and geomagnetic parameters. There is a lack of studies estimating solar and geomagnetic parameters for the Carrington event.

    A New Deep-Learning Approach to Infer Solar and Geomagnetic Parameters for the 1859 Carrington Event · 2026 · DOI

  • Recent numerical results indicate that very high resolution and robust seeding are needed to properly resolve plasmoid-mediated fast reconnection in undriven two-dimensional MHD, suggesting limitations of current simulation capabilities.

    Conservation of magnetic-helicity fluctuations due to spatial decorrelation of fluxes in decaying MHD turbulence · 2026 · DOI

  • For the newly identified class of gauges (3.17) where magnetic-helicity may not be conserved, it is conjectured that helicity density is redistributed along wandering field lines, but this aspect requires exploration in future work.

    Conservation of magnetic-helicity fluctuations due to spatial decorrelation of fluxes in decaying MHD turbulence · 2026 · DOI

  • The paper notes that the skill of the models remains modest, and the optimal saturation is model- and task-dependent.

    JW-FD: A 15-Year Multimodal Dataset for Solar Flare Forecasting · 2026 · DOI

  • The study only analyzes data from a pore, - The analysis is limited to a specific frequency range, - The study does not provide a detailed comparison with other…

    Detection of resonant nodes in a pore chromosphere · 2026 · DOI

  • Line classification is challenging and occasionally results in misclassifications, - Some clearly visible lines remain unidentified, - The very low flux reaching the detector in the ultraviolet complicates matters for measurements…

    A Forest of Emission Lines Observed by Sunrise III/SUSI above the Solar Limb · 2026 · DOI

  • Further analysis of the unidentified lines, - Comparison with other solar atlases and line lists, - Investigation of the properties of the rare-earth and heavy elements emission…

    A Forest of Emission Lines Observed by Sunrise III/SUSI above the Solar Limb · 2026 · DOI

  • Further investigation of the small energy-dependent time lag of 37 ± 27, - Analysis of nonlinear processes in the QPP phenomenon, - Study of the unified physical mechanism driving QPPs across the entire HXR emission…

    Hard X-Ray Quasiperiodic Pulsations in X-class Solar Flares Observed by Aditya-L1/HEL1OS · 2026 · DOI

  • Limited temporal sampling, - Gaps in the ground-based observations, - Difficulty of associating individual circumfacular regions with specific active regions, - The estimate of the delay between the appearance of the plage and the circumfacular region should be regarded…

    Properties of Circumfacular Regions Derived from H α and Ca ii K Synoptic Observations of the Sun · 2026 · DOI

  • Investigate the role of MHD responses in modulating quasi-periodic plasma release, - Examine the relationship between observationally constrained local or substreamer structures and candidate oscillatory timescales, - Study the effects of tearing and plasmoid formation on quasi-periodic plasma…

    Can MHD Oscillations Modulate Quasi-periodic Plasma Release from Coronal Streamers? · 2026 · DOI

  • Future work combining time-dependent data-driven simulations and higher-cadence, high-resolution observations will be essential to further constrain the formation and evolution of filament-supporting magnetic…

    Connectivity rewiring and filament formation by active region emergence observed with Solar Orbiter · 2026 · DOI

Most-cited papers in Solar and Space Plasma Dynamics

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Open questions raised by papers listed on this page include: (1) Internal velocity distributions of CMEs are not well understood (“CME Kinematics with Optical Flow: Multicoronagraph Insights into Internal…”, 2026); (2) The mechanisms of particle acceleration in solar flares are not well understood (“Electron Acceleration by Turbulent Reconnection in Solar Flares”, 2026); (3) The lack of a comprehensive catalogue of QPPs in X-class solar flares (“Hard X-Ray Quasiperiodic Pulsations in X-class Solar Flares Observed by…”, 2026); (4) Further research is needed to improve the realism and accuracy of solar flare simulations (“The Role of Nonlocal Thermal Transport in Flare-driven Chromospheric Evaporation”, 2026); (5) There is a need for a proxy that can be used to identify the solar wind source region in the absence of in situ charge state measurements (“Proton Specific Entropy as a Proxy for the O 7+ /O 6+ Charge State Ratio over…”, 2026). 393 gap statements have been mined from Solar and Space Plasma Dynamics papers in our 7.9M-paper local library, which holds 2,144 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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