Testing spacecraft charging predictions as Parker Solar Probe approaches the Sun

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Table 1.

Plasma parameters used in analytic estimate.

R	n_e	T_e	n_e, s	T_e, s	n_i	T_i
			(1,2)	(1,2)
32 R_S	481	31.6	9.62	173	244	29.6
30 R_S	540	33.6	10.8	173	334	31.2
27.87 R_S	387	34.4	7.74	173	234	44.9
26 R_S	481	37.6	9.62	173	393	37.2
24 R_S	674	41.8	13.48	173	436	32.6
22 R_S	675	42	13.5	173	643	35.2
20.36 R_S	758	45	15.16	173	699	48.1
18 R_S	1224	48.7	24.48	173	1383	39.8
15.977 R_S	2099	52.8	41.98	173	2178	43.4
13.28 R_S	2618	61.5	52.36	173	3517	50.4
11.44 R_S	3683	66.9	73.66	173	4709	44
9.8 R_S	3770	76.8	75.4	173	3089	92.7

Notes. (1) Halekas et al. (2020); (2) Abraham et al. (2022). Electron densities and temperatures come from the QTN data and previous solar wind studies. Ion densities and temperatures are determined from SPAN-I ion moments. R is the radial distance value; n_e is the QTN total electron density in cm⁻³; T_e is the QTN total electron temperature in eV; n_e, s is the estimated density of the strahl electrons; T_e, s is the estimated temperature of the strahl electrons in eV; n_i is the SPAN-I proton density in (/cm³); and T_i is the SPAN-I proton core temperature in eV.

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