In weakly collisional plasmas, convergence of electron temperature diagnostics reflects repeated measurement of one effective temperature from the ionization bottleneck rather than robust confirmation of core temperature.
2026a,The Diagnostic Temperature Dis- crepancy as Evidence for Non-Maxwellian Coronal Elec- trons, The Open Journal of Astrophysics9
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The quiet-Sun temperature ratio R≈2.4 equals the KL-divergence difference between a κ=2.5 distribution and its EUV and radio Maxwellian projections, satisfying ΔD_KL = (3/2)[R0 − ln R0 − 1] = (3/2) d_IS(T_eff, T_core).
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Multi-diagnostic convergence: a single measurement in weakly collisional plasmas
In weakly collisional plasmas, convergence of electron temperature diagnostics reflects repeated measurement of one effective temperature from the ionization bottleneck rather than robust confirmation of core temperature.
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Diagnostic Disagreement as an Information-Projection Divergence: An Information-Theoretic Reading of the Quiet-Sun Temperature Ratio
The quiet-Sun temperature ratio R≈2.4 equals the KL-divergence difference between a κ=2.5 distribution and its EUV and radio Maxwellian projections, satisfying ΔD_KL = (3/2)[R0 − ln R0 − 1] = (3/2) d_IS(T_eff, T_core).