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Merged
ghislainp merged 3 commits into from
Mar 7, 2026
Merged

ice permittivity Cuzzi1980 added #83

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759328f
ice permittivity Cuzzi1980 added
Mar 2, 2026
2ff4051
Cuzzi et al. 1980 ice permittivity pytest passed with temperature as …
Mar 3, 2026
6ec5e92
Cuzzi et al. 1980 ice permittivity pytest passed with temperature as …
Mar 3, 2026
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21 changes: 20 additions & 1 deletion smrt/permittivity/ice.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,7 @@

# local import
# from ..core.error import SMRTError
from ..core.globalconstants import DENSITY_OF_ICE, FREEZING_POINT
from ..core.globalconstants import DENSITY_OF_ICE, FREEZING_POINT, C_SPEED
from ..core.layer import layer_properties

#
Expand Down Expand Up @@ -75,6 +75,25 @@ def ice_permittivity_maetzler06(frequency, temperature):

return Ereal + 1j * Eimag

@layer_properties("temperature")
def ice_permittivity_Cuzzi_et_al_1980(frequency,temperature=100):
'''
From the theoritical curve at 100 K (Whalley and Labbe (1969)) for water ice
In Table 1 of DOI: 10.1016/0019-1035(80)90137-2

Used in Cuzzi et al., 1980 for modeling the thermal emission from C-ring particles at 2.2-cm wavelength. Therefore relevant for Enceladus like temperature

'''
if abs(temperature - 100) > 10:
raise SMRTError("ice_permittivity_Cuzzi_et_al_1980 valid only near 100 K")

wavelength_in_cm = (C_SPEED/frequency)*100 #cm
refractive_index = 1.78+1j*(7.5e-5/wavelength_in_cm)
E_ice=refractive_index**2

return E_ice



@layer_properties("temperature")
def ice_permittivity_maetzler98(frequency, temperature):
Expand Down
2 changes: 2 additions & 0 deletions smrt/permittivity/test_ice.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
ice_permittivity_maetzler06,
ice_permittivity_maetzler87,
ice_permittivity_tiuri84,
ice_permittivity_Cuzzi_et_al_1980
)

# Input temperature array functionality removed. If ever needed, use numpy instead of math in ice.py, but slower.
Expand Down Expand Up @@ -41,6 +42,7 @@
(_ice_permittivity_HUT, 10e9, 270, 3.18567, 8.86909246416410e-04, 1e-8, 1e-8),
(_ice_permittivity_DMRTML, 10e9, 270, 3.18567, 9.0679820556720323e-04, 1e-8, 1e-8),
(ice_permittivity_hufford91_maetzler87, 10e9, 270, 3.18567, 0.0009650945, 1e-8, 1e-8),
(ice_permittivity_Cuzzi_et_al_1980, 10e9, 100,3.1683999993, 8.906161341790659e-05, 1e-8, 1e-8),
],
)
def test_ice_permittivity(permittivity_model, frequency, temperature, real, imag, ratol, iatol):
Expand Down