The near-nucleus gas coma of comet 67P/Churyumov-Gerasimenko prior to the descent of the surface lander PHILAE

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Volume 618 (October 2018)

A&A, 618 (2018) A71

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Table 1

Comparison of the model predictions with COPS and DFMS measurements in different time segments.

Acronym	Method	w	it	Time segment	δ_n	σ_n			δ_CO	σ_CO
				01.08-30.11	0.946	1.008	0.379	0.371	0.665	0.845	0.776	0.164
f033c1w00	EE	0.0	0	15.09-30.10	1.192	1.227	0.412	0.445	0.797	1.130	0.757	0.193
				08.10-12.10	1.196	1.264	0.334	0.383	0.423	0.515	0.767	0.164
				01.08-30.11	0.406	0.467	0.394	0.369	1.606	1.955	0.561	0.245
f033c1w10	EE	1.0	0	15.09-30.10	0.450	0.605	0.467	0.392	2.168	2.401	0.608	0.219
				08.10-12.10	0.509	0.534	0.377	0.381	1.668	1.538	0.634	0.207
				01.08-30.11	0.392	0.374	0.251	0.270	0.596	0.695	0.386	0.393
f002a1w00	EE	0.0	2	15.09-30.10	0.466	0.475	0.260	0.298	0.690	0.930	0.431	0.495
				08.10-12.10	0.497	0.483	0.160	0.200	0.364	0.424	0.305	0.295
				01.08-30.11	0.456	0.502	0.306	0.302	0.505	0.506	0.574	0.405
f002a1w10	EE	1.0	2	15.09-30.10	0.502	0.628	0.348	0.330	0.589	0.662	0.552	0.391
				08.10-12.10	0.593	0.666	0.294	0.322	0.438	0.323	0.470	0.298
				01.08-30.11
f004a3w00	EE	0.0	4	15.09-30.10	0.309	0.229	0.289	0.284	0.707	0.861	0.475	0.487
				08.10-12.10	0.298	0.227	0.199	0.221	0.412	0.333	0.326	0.252
				01.08-30.11
m004a3w00	DSMC	0.0	4	15.09-30.10	0.275	0.285	0.188	0.186	0.581	0.681	0.327	0.328
				08.10-12.10	0.338	0.291	0.119	0.134	0.227	0.200	0.226	0.164

Notes. Here method denotes the method of gas flow description (Euler equations or DSMC), w is the proportion of instantaneous and rotation-averaged energy input (see Eq. (1)), it is the iteration number of inhomogeneity factors adaptation, δ_n is the mean, σ_n is the dispersion of relative differences in the simulated and measured overall gas densities, and , , δ_CO are the means and σ_n, , , and σ_CO are the dispersions of relative differences in the simulated and measured relative abundances of H₂O, CO, and CO₂ at the position of the orbiter (see Eq. (8)).

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