An optimization algorithm determines the optimal source surface radius for PFSS models by minimizing MSE against PSP radial field data from encounters 1-19 after backmapping, yielding increasing R_ss from solar minimum into cycle 25 ascending phase with improved open flux agreement.
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A covariant first-principles reformulation of the Expanding Box Model treats solar wind expansion as an anisotropic spacetime metric, eliminating prior mathematical artifacts and recovering observed scalings.
CMEs during active solar phases are faster with stronger magnetic fields than in quiet phases (even after speed matching), while toroidal and poloidal field components decay similarly with distance and front-to-rear asymmetry increases.
Polytropic stellar wind models are extended beyond extreme adiabatic cases to non-adiabatic localized heating, with added energy shown plausible relative to flares and relevant to solar wind observations.
Nonlinear hybrid models of PSP-observed anisotropic hot-beam ion VDFs produce combined ion-cyclotron and magnetosonic instabilities whose nonlinear stage yields qualitative agreement with observed hammerhead distributions.
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First Principles Magnetohydrodynamical Theory for the Expanding Box Model
A covariant first-principles reformulation of the Expanding Box Model treats solar wind expansion as an anisotropic spacetime metric, eliminating prior mathematical artifacts and recovering observed scalings.