choclo.prism.magnetic_nn#
- choclo.prism.magnetic_nn(easting, northing, upward, prism_west, prism_east, prism_south, prism_north, prism_bottom, prism_top, magnetization_east, magnetization_north, magnetization_up)[source]#
Northing derivative of the northing component of the magnetic field.
Returns the northing derivative of the northing component of the magnetic field due to a single rectangular prism on a single computation point.
- Parameters:
- easting, northing, upward
float Easting, northing and upward coordinates of the observation point. Must be in meters.
- prism_west, prism_east, prism_south, prism_north, prism_bottom, prism_top
float The boundaries of the prism. Must be in meters.
- magnetization_east
float The East component of the magnetization vector of the prism. Must be in \(A m^{-1}\).
- magnetization_north
float The North component of the magnetization vector of the prism. Must be in \(A m^{-1}\).
- magnetization_up
float The upward component of the magnetization vector of the prism. Must be in \(A m^{-1}\).
- easting, northing, upward
- Returns:
- b_nn
float Northing derivative of the northing component of the magnetic field generated by the prism on the observation point in \(\text{T}\). Return
numpy.nanif the observation point falls in a singular point: prism vertices, prism edges or interior points.
- b_nn
See also
Notes
Computes the northing derivative of the northing component of the magnetic field \(\mathbf{B}(\mathbf{p})\) generated by a rectangular prism \(R\) with a magnetization vector \(M\) on the observation point \(\mathbf{p}\) as follows:
\[B_{yy}(\mathbf{p}) = \frac{\mu_0}{4\pi} \left( M_x u_{xyy} + M_y u_{yyy} + M_z u_{yyz} \right)\]Where \(u_{ijk}\) are:
\[u_{ijk} = \frac{\partial^3}{\partial i \partial j \partial k} \int\limits_R \frac{1}{\lVert \mathbf{p} - \mathbf{q} \rVert} dv\]with \(i,j,k \in \{x, y, z\}\).
References