The transition from slow to fast wind as observed in composition observations

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Table 1.

Parameters derived from the fits in Eq. (1), the fast wind fractionation, and the data available for speeds v_sw < v_s for each species.

	Vanishing	Saturation	Saturation	Fast Wind	Fastest	Slow Wind
	Speed	Speed	Abundance	Slope	Abundance	Observations
	v_v	v_s	A_s	m_i	A(592 km s⁻¹)	v_sw < v_s
	km s⁻¹	km s⁻¹	[#]	[% km⁻¹s]	[#]	[%]
SWE	234 ± 3	402 ± 2	0.530 ± 0.004	0.00056 ± 0.00003	0.63 ± 0.04	57
He	243 ± 3	390 ± 4	0.496 ± 0.009	0.00055 ± 0.00007	0.59 ± 0.09	44
C	220 ± 7	333 ± 7	0.378 ± 0.013	0.00152 ± 0.00005	0.73 ± 0.10	18
N	224 ± 6	326 ± 4	0.398 ± 0.008	0.00158 ± 0.00004	0.80 ± 0.13	17
O	228 ± 6	327 ± 4	0.349 ± 0.008	0.00115 ± 0.00004	0.62 ± 0.07	18
Ne	196 ± 17	320 ± 4	0.269 ± 0.004	0.00048 ± 0.00002	0.40 ± 0.03	18
Mg	221 ± 13	327 ± 5	0.645 ± 0.011	0.00108 ± 0.00007	0.86 ± 0.18	17
Si	214 ± 12	330 ± 4	0.921 ± 0.015	0.00178 ± 0.00008	1.31 ± 0.48	17
S	156 ± 45	327 ± 10	0.729 ± 0.018	0.00132 ± 0.00008	1.05 ± 0.30	14
Fe	168 ± 34	331 ± 6	0.933 ± 0.012	0.00034 ± 0.00009	0.99 ± 0.37	16

Avg	221 ± 3	327 ± 2	0.383 ± 0.003	0.00083 ± 0.00001	–	–
Low FIP	212 ± 8	329 ± 3	0.795 ± 0.007	0.00115 ± 0.00004	–	–
High FIP	223 ± 4	326 ± 2	0.302 ± 0.003	0.00079 ± 0.00002	–	–

Notes. The parameters describing the fits to Eq. (1) are the saturation speeds (v_s), saturation abundances (A_s), the slow wind x intercept (v_v, vanishing speed), and the fast wind slope (m_i). The abundance observed at 592 km s⁻¹ is given by A(592 km s⁻¹). All abundances are normalized to their photospheric value. SWE is He/H observed at Wind. The average value was calculated excluding SWE and SWICS He/H. High and low FIP averages exclude He/H as well. The percentage of data in slow wind regions (v_sw < v_s) shows that nontrivial portions of the observations occur at these speeds.

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