Parabolic cylindrical coordinates

File:Conical coordinates.png

Coordinate surfaces of the conical coordinates. The constants b and c were chosen as 1 and 2, respectively. The red sphere represents r=2, the blue elliptic cone aligned with the vertical z-axis represents μ=cosh(1) and the yellow elliptic cone aligned with the (green) x-axis corresponds to ν² = 2/3. The three surfaces intersect at the point P (shown as a black sphere) with Cartesian coordinates roughly (1.26, -0.78, 1.34). The elliptic cones intersect the sphere in taco-shaped curves.

Conical coordinates are a three-dimensional orthogonal coordinate system consisting of concentric spheres (described by their radius $r$) and by two families of perpendicular cones, aligned along the z- and x-axes, respectively.

Basic definitions

The conical coordinates $(r,\mu ,\nu )$ are defined by

$x=\frac{r\mu \nu }{bc}$

$y=\frac{r}{b}\sqrt{\frac{({\mu }^2-b^2)({\nu }^2-b^2)}{(b^2-c^2)}}$

$z=\frac{r}{c}\sqrt{\frac{({\mu }^2-c^2)({\nu }^2-c^2)}{(c^2-b^2)}}$

with the following limitations on the coordinates

${\nu }^2<c^2<{\mu }^2<b^2$

Surfaces of constant $r$ are spheres of that radius centered on the origin

$x^2+y^2+z^2=r^2$

whereas surfaces of constant $\mu$ and $\nu$ are mutually perpendicular cones

$\frac{x^2}{{\mu }^2}+\frac{y^2}{{\mu }^2-b^2}+\frac{z^2}{{\mu }^2-c^2}=0$

$\frac{x^2}{{\nu }^2}+\frac{y^2}{{\nu }^2-b^2}+\frac{z^2}{{\nu }^2-c^2}=0$

In this coordinate system, both Laplace's equation and the Helmholtz equation are separable.

Scale factors

The scale factor for the radius $r$ is one ($h_r=1$), as in spherical coordinates. The scale factors for the two conical coordinates are

$h_{\mu }=r\sqrt{\frac{{\mu }^2-{\nu }^2}{(b^2-{\mu }^2)({\mu }^2-c^2)}}$

$h_{\nu }=r\sqrt{\frac{{\mu }^2-{\nu }^2}{(b^2-{\nu }^2)(c^2-{\nu }^2)}}$

References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

Bibliography

• 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
  
  My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
• 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
  
  My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
• 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
  
  My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
• 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
  
  My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
• 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
  
  My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
• 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
  
  My blog: http://www.primaboinca.com/view_profile.php?userid=5889534

External links

• MathWorld description of conical coordinates