Symbol
Meaning
Typical unit
Introducing
equation
A var
Temporary variable used in the definition of
the Pareto distribution
4.85
b
Impact parameter
[m]
3.2
B
Magnetic field vector
3.92
b d , b c
Power-law index for dust particle size calculations (b c is used to differentiate between
the coma and the surface)
Unitless
4.75, 4.102
B CB
Model for coherent backscatter opposition
effect (CBOE)
Unitless
2.69
b far
Impact parameter where optical depth
effects are negligible
[m]
4.107
B SH
Model for shadow-hiding opposition effect
(SHOE)
Unitless
2.69
B ϑ,λ
Spectral distribution of radiated flux
(in frequency and wavelength)
[W m
À2 sr
À1
Hz
À1
], [W m
À2
sr
À1 m
À1
]
2.8, 2.9
c
Speed of light
[m s
À1 ]
3.24
C D
Drag coefficient
Unitless
4.88
C ex
Collisional excitation rate
[m
À3 s
À1
]
3.39
c mix
Specific heat capacity of an ice–silicate
mixture
[J kg
À1 K
À1
]
2.120
c NGF , m NGF ,
k NGF ,
n NGF
Constants for the determination of g(r h )
Unitless
1.22
c s
Speed of sound
[m s
À1 ]
3.53
c SHC
Specific heat capacity of a material
[J K
À1 kg
À1
]
2.104
C x
Jacobi constant with respect to planet x
1.18
D
A size distribution where D min and D max are
the minimum and maximum sizes possible
in the size-frequency distribution (Pareto
distribution)
4.82
d el
Electrical skin depth of a layer
[m]
2.110
D f
Fractal mass dimension
Unitless
4.37
D g
Gas diffusion coefficient
[m
2 s
À1
]
2.136
D K
eff
Effective diffusivity
[m
2 s
À1
]
3.104
d l
Lever arm with respect to rotation axis
[m]
4.114
d m
Molecular diameter
[m]
3.100
dQ d /da
Differential particle size production rate for
particle radius a
4.58
D p
Pore area fractal dimension
Unitless
2.119
d t
Thermal diffusivity
[m
2 s
À1
]
2.103
D t
Tortuosity fractal dimension
2.119
E
Electric field vector
[V m
À1
]
2.131
E
Quantized potential energy
[J]
3.23
(continued)
xxiv
Symbols Used
Meaning
Typical unit
Introducing
equation
A var
Temporary variable used in the definition of
the Pareto distribution
4.85
b
Impact parameter
[m]
3.2
B
Magnetic field vector
3.92
b d , b c
Power-law index for dust particle size calculations (b c is used to differentiate between
the coma and the surface)
Unitless
4.75, 4.102
B CB
Model for coherent backscatter opposition
effect (CBOE)
Unitless
2.69
b far
Impact parameter where optical depth
effects are negligible
[m]
4.107
B SH
Model for shadow-hiding opposition effect
(SHOE)
Unitless
2.69
B ϑ,λ
Spectral distribution of radiated flux
(in frequency and wavelength)
[W m
À2 sr
À1
Hz
À1
], [W m
À2
sr
À1 m
À1
]
2.8, 2.9
c
Speed of light
[m s
À1 ]
3.24
C D
Drag coefficient
Unitless
4.88
C ex
Collisional excitation rate
[m
À3 s
À1
]
3.39
c mix
Specific heat capacity of an ice–silicate
mixture
[J kg
À1 K
À1
]
2.120
c NGF , m NGF ,
k NGF ,
n NGF
Constants for the determination of g(r h )
Unitless
1.22
c s
Speed of sound
[m s
À1 ]
3.53
c SHC
Specific heat capacity of a material
[J K
À1 kg
À1
]
2.104
C x
Jacobi constant with respect to planet x
1.18
D
A size distribution where D min and D max are
the minimum and maximum sizes possible
in the size-frequency distribution (Pareto
distribution)
4.82
d el
Electrical skin depth of a layer
[m]
2.110
D f
Fractal mass dimension
Unitless
4.37
D g
Gas diffusion coefficient
[m
2 s
À1
]
2.136
D K
eff
Effective diffusivity
[m
2 s
À1
]
3.104
d l
Lever arm with respect to rotation axis
[m]
4.114
d m
Molecular diameter
[m]
3.100
dQ d /da
Differential particle size production rate for
particle radius a
4.58
D p
Pore area fractal dimension
Unitless
2.119
d t
Thermal diffusivity
[m
2 s
À1
]
2.103
D t
Tortuosity fractal dimension
2.119
E
Electric field vector
[V m
À1
]
2.131
E
Quantized potential energy
[J]
3.23
(continued)
xxiv
Symbols Used