Table 4
Real part of the permittivity ϵ′ estimated at 90 MHz for an ice-free dust mantle surrounding the nucleus, as a function of the temperature from 300 to 40 K and for different porosities equal to 50, 60, 70, 80, and 90%.
| Ice-free dust mantle | ||||||
|
|
||||||
| Temperature (K) | 300 | 230 | 173 | 113 | 40 | |
|
|
||||||
| ϵ′ (Φ = 90%) | 1.47 | 1.38 | 1.14 | 1.05 | m.l. | |
| ϵ′ (Φ = 80%) | 1.94 | 1.82 | 1.51 | 1.39 | 1.04 | |
| ϵ′ (Φ = 70%) | 2.41 | 2.27 | 1.88 | 1.72 | 1.29 | |
| ϵ′ (Φ = 60%) | 2.88 | 2.71 | 2.25 | 2.06 | 1.54 | |
| ϵ′ (Φ = 50%) | 3.35 | 3.15 | 2.61 | 2.39 | 1.79 | |
Notes. m.l.: model limit, i.e., permittivity behavior with very high porosity and cryogenic temperatures, currently under development.
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