Plasma parameters (plasmapy.formulary.parameters)

This module gathers basic and general plasma parameters such as the plasma frequency or Debye length.

Functions

Alfven_speed(B, density, Unit(“kg / m3”)][, …])	Return the Alfvén speed.
Bohm_diffusion(T_e, B)	The Bohm diffusion coefficient was conjectured to follow Bohm model of the diffusion of plasma across a magnetic field and describe the diffusion of early fusion energy machines.
betaH_(n, T, B, ion[, particle, …])	Alias to Hall_parameter().
cs_(T_e, T_i, n_e, k[, gamma_e, gamma_i, …])	Alias to ion_sound_speed().
cwp_(n, particle)	Alias to inertial_length().
DB_(T_e, B)	Alias to Bohm_diffusion().
Debye_length(T_e, n_e)	Calculate the characteristic decay length for electric fields,
Debye_number(T_e, n_e)	Return the number of electrons within a sphere with a radius of the Debye length.
gyrofrequency(B[, particle, signed, Z, to_hz])	Calculate the particle gyrofrequency in units of radians per second.
gyroradius(B[, particle])	Return the particle gyroradius.
Hall_parameter(n, T, B, ion[, particle, …])	Calculate the ratio between the particle gyrofrequency and the particle-ion particle collision rate.
inertial_length(n, particle)	Calculate a charged particle’s inertial length.
ion_sound_speed(T_e, T_i, n_e, k[, gamma_e, …])	Return the ion sound speed for an electron-ion plasma.
kappa_thermal_speed(T, kappa[, particle, method])	Return the most probable speed for a particle within a Kappa distribution.
lambdaD_(T_e, n_e)	Alias to Debye_length().
lower_hybrid_frequency(B, n_i[, ion, to_hz])	Return the lower hybrid frequency.
magnetic_energy_density(B)	Calculate the magnetic energy density.
magnetic_pressure(B)	Calculate the magnetic pressure.
mass_density(density, Unit(“kg / m3”)], …)	Utility function to merge two possible inputs for particle charge.
nD_(T_e, n_e)	Alias to Debye_number().
oc_(B[, particle, signed, Z, to_hz])	Alias to gyrofrequency().
plasma_frequency(n[, particle, z_mean, to_hz])	Calculate the particle plasma frequency.
pmag_(B)	Alias to magnetic_pressure().
pth_(T, n)	Alias to thermal_pressure().
rc_(B[, particle])	Alias to gyroradius().
rho_(density, Unit(“kg / m3”)], particle, z_mean)	Alias to mass_density().
rhoc_(B[, particle])	Alias to gyroradius().
thermal_pressure(T, n)	Return the thermal pressure for a Maxwellian distribution.
thermal_speed(T, particle[, method, ndim])	Return the most probable speed for a particle within a Maxwellian distribution.
ub_(B)	Alias to magnetic_energy_density().
upper_hybrid_frequency(B, n_e[, to_hz])	Return the upper hybrid frequency.
va_(B, density, Unit(“kg / m3”)][, ion, z_mean])	Alias to Alfven_speed().
vth_(T, particle[, method, ndim])	Alias to thermal_speed().
vth_kappa_(T, kappa[, particle, method])	Alias to kappa_thermal_speed().
wc_(B[, particle, signed, Z, to_hz])	Alias to gyrofrequency().
wp_(n[, particle, z_mean, to_hz])	Alias to plasma_frequency().
wlh_(B, n_i[, ion, to_hz])	Alias to lower_hybrid_frequency().
wuh_(B, n_e[, to_hz])	Alias to upper_hybrid_frequency().

Examples

1D Maxwellian distribution function

Thermal Speed