j0j0_integrand_sum — j0j0_integrand

Function to calculate the sum in the j0j0 integrand.

j0j0_integrand_sum(
  go_up_or_down,
  l_0,
  l_scale,
  p_perp,
  directions,
  k_perp,
  k_par,
  omega,
  omega_c,
  mass,
  distribution
)

Arguments

go_up_or_down	`character` starting from l_0, go "up" or go "down"
l_0	`integer` Starting point for sum over l values.
l_scale	`integer` Relevant range of l values
p_perp	`numeric` component of momentum vector perpendicular to the magnetic field divided by p_scale. Should be near 1.
directions	`character` vector with two spatial directions: acombination of x, y, and z. e.g xx, xy or yz.
k_perp	`numeric` length of component of wavevector perpendicular to the magnetic field.
k_par	`numeric` length of component of wavevector parallel to the magnetic field.
omega	`numeric` angular cyclotron frequency of current fluctuations.
omega_c	`numeric` particle angular cyclotron frequency (omega_c = qB/m).
mass	`numeric` particle mass in kg.
distribution	`list` with the velocity distribution.

numeric