Plasma parameters (plasmapy.formulary.parameters)

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


mass_density(density, Unit(“kg / m3”)], …) Utility function to merge two possible inputs for particle charge.
Alfven_speed(B, density, Unit(“kg / m3”)][, …]) Return the Alfvén speed.
ion_sound_speed(T_e, T_i, n_e, k[, gamma_e, …]) Return the ion sound speed for an electron-ion plasma.
thermal_speed(T, particle[, method, ndim]) Return the most probable speed for a particle within a Maxwellian distribution.
thermal_pressure(T, n) Return the thermal pressure for a Maxwellian distribution.
kappa_thermal_speed(T, kappa[, particle, method]) Return the most probable speed for a particle within a Kappa distribution.
Hall_parameter(n, T, B, ion[, particle, …]) Calculate the ratio between the particle gyrofrequency and the particle-ion particle collision rate.
gyrofrequency(B[, particle, signed, Z, to_hz]) Calculate the particle gyrofrequency in units of radians per second.
gyroradius(B[, particle]) Return the particle gyroradius.
plasma_frequency(n[, particle, z_mean, to_hz]) Calculate the particle plasma frequency.
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.
inertial_length(n, particle) Calculate a charged particle’s inertial length.
magnetic_pressure(B) Calculate the magnetic pressure.
magnetic_energy_density(B) Calculate the magnetic energy density.
upper_hybrid_frequency(B, n_e[, to_hz]) Return the upper hybrid frequency.
lower_hybrid_frequency(B, n_i[, ion, to_hz]) Return the lower hybrid frequency.
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.