Table 4.

Geophysical regimes used to build 1D point models of Europa

	Regime	Mode 1	Mode 2
Surface & Near-Surface	Surface Roughness	Ridged Plains	Chaotic Terrain
		${\sigma }_{HF}=2.2\text{ m}$	${\sigma }_{HF}=6\text{ m}$
		${\sigma }_{VHF}=0.5\text{ m}$	${\sigma }_{VHF}=2.2\text{ m}$
	Density	Non-Porous	Porous
		910 kg m −3	518 kg m−3
	Composition	Clean Ice	Brine-Filled Ice
		ε = 3.15	ε = 9
	Thickness	Thin	Thick
		0.5 m	200 m
Subsurface	Deep Regolith	Absent	Present
		Non-Porous	22% Porosity, 22 cm Pore Radius
	Surface Temperature	Polar	Equatorial
		50 K	100 K
	Ice Shell Composition	Pure	Marine
		0 μM Cl−	60 μM Cl−
	Ice Shell Thickness	Thin	Thick
		3 km	30 km
	Salt Layer Thickness	0.2 m	1 m
	Salt Layer Depth	1/2 Ice Shell Thickness	10 km
	Subsurface Water Interface	Sharp	Mush
		Water	30% Ice-Water Mixture
	Basal Temperature	Melting Temperature	Eutectic Temperature
		270 K	250 K