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Poloidal Field

Generates a grid holding an axisymmetric multipole potential field of a chosen degree and moment, optionally plus a uniform Cartesian field. It is a quick synthetic field for testing tracing and null-point finding.

Inputs

None.

Parameter ports

Added from the Parameters pane (⊕). While connected, each drives its parameter.

Port	Accepts	Mode	Description
`r`	primitive(array)	opt-in drives `r`	Drives the r Range parameter while connected
`theta`	primitive(array)	opt-in drives `theta`	Drives the theta Range parameter while connected
`phi`	primitive(array)	opt-in drives `phi`	Drives the phi Range parameter while connected
`nr`	primitive(number)	opt-in drives `nr`	Drives the Points along r parameter while connected
`nt`	primitive(number)	opt-in drives `nt`	Drives the Points along theta parameter while connected
`nphi`	primitive(number)	opt-in drives `nphi`	Drives the Points along phi parameter while connected
`degree`	primitive(number)	opt-in drives `degree`	Drives the Degree (l) parameter while connected
`moment`	primitive(number)	opt-in drives `moment`	Drives the Moment parameter while connected
`uniform`	primitive(number)	opt-in drives `uniform`	Drives the Uniform Field parameter while connected
`uniform_direction`	primitive(array)	opt-in drives `uniform_direction`	Drives the Uniform Direction parameter while connected

Outputs

dataset(grid)

Parameters

Parameter	Kind	Default	Choices / range	Unit	Notes
r Range `r`	range	`(1, 2.5)`		R_sun	⇄ port
theta Range `theta`	range	`(0, 180)`		deg	⇄ port
phi Range `phi`	range	`(0, 360)`		deg	⇄ port
Points along r `nr`	int	`50`	2 to 2000		⇄ port
Points along theta `nt`	int	`91`	2 to 2000		⇄ port
Points along phi `nphi`	int	`181`	2 to 2000		⇄ port
Degree (l) `degree`	int	`1`	1 to 20		⇄ port
Moment `moment`	float	`1`		G	⇄ port
Uniform Field `uniform`	float	`0`		G	⇄ port
Uniform Direction `uniform_direction`	vector	`(1, 0, 0)`			⇄ port

Used by

No stock template or group uses this node.