Hall_parameter

plasmapy.formulary.parameters.Hall_parameter(n: Unit("1 / m3"), T: Unit("K"), B: Unit("T"), ion: plasmapy.particles.particle_class.Particle, particle: plasmapy.particles.particle_class.Particle, coulomb_log=None, V=None, coulomb_log_method='classical')

Calculate the ratio between the particle gyrofrequency and the particle-ion particle collision rate.

All parameters apply to particle.

Aliases: betaH_

Parameters:
  • n (Quantity) – The density of particle s
  • T (Quantity) – The temperature of particles
  • B (Quantity) – The magnetic field
  • ion (Particle) – The type of ion particle is colliding with.
  • particle (Particle) – The particle of interest.
  • coulomb_log (float, optional) – Preset value for the Coulomb logarithm. Used mostly for testing purposes.
  • V (Quantity) – The relative velocity between particle and ion particles.
  • coulomb_log_method (str, optional) – Method used for Coulomb logarithm calculation. Refer to its documentation.

See also

plasmapy.formulary.parameters.gyrofrequency(), plasmapy.formulary.parameters.fundamental_electron_collision_freq(), plasmapy.formulary.collisions.Coulomb_logarithm()

Returns:
Return type:astropy.units.quantity.Quantity

Examples

>>> from astropy import units as u
>>> Hall_parameter(1e10 * u.m**-3, 2.8e3 * u.eV, 2.3 * u.T, 'He-4 +1', 'e-')
<Quantity 7.26446...e+16>
>>> Hall_parameter(1e10 * u.m**-3, 5.8e3 * u.eV, 2.3 * u.T, 'He-4 +1', 'e-')
<Quantity 2.11158...e+17>