Impact of nonthermal electron distributions on the triggering of the ion-ion acoustic instability near the Sun: Kinetic simulations

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Table 2.

Theoretical vs simulated instability parameters for core–strahl-distributed electrons.

Name	$\frac{n_{es}}{n_{c}}$ $\frac{n_{\mathrm{es}}}{n_{\mathrm{c}}}$	$\frac{T_{es}}{T_{c}}$ $\frac{T_{\mathrm{es}}}{T_{\mathrm{c}}}$	(ω/ω_pc)_Th	(v_res/v_th, c)_Th	(γ/ω_pc)_Th	(γ/ω_pc)_Sim
Case A	0.2	15.0	0.268	3.347	0.0039	0.00576
Case B	0.2	20.0	0.270	3.367	0.0049	0.00668
Case C	0.2	25.0	0.270	3.379	0.0055	0.00737
Case D	0.2	30.0	0.271	3.387	0.0059	0.00783
Case C′	0.15	25.0	0.268	3.349	0.0039	0.00587

Notes. The table compares theoretical (Th) growth rates, frequencies, and resonant velocities v_res = ω/k and observed simulation growth rates (Sim) for core–strahl-distributed electrons across various strahl densities and temperatures. Parameters kept fixed for all cases are V_d/v_th, c = 5, n_b/n_c = 0.05, T_b/T_c = 1.0, and kλ_Dc = 0.08.

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