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Flow Along Lines

Re-times existing field lines by the plasma speed along them, and resamples every line at uniform travel-time instants. flow runs each line with the plasma (from its upstream end) or against it (from its downstream end); a segment slower than stall stops the particle there. Drop it between a trace and a Slice window so an animated window follows the plasma speed instead of the point index.

Inputs

Port	Accepts	Required	Description
`lines`	dataset(stack)	required	The field lines to re-time (FieldLines, or a 1-D stack as one line)
`field` Vector Field	generator(reader)	required	The Vector Field (vr, vt, vp) that supplies the velocity

Parameter ports

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

Port	Accepts	Mode	Description
`samples`	primitive(number)	opt-in drives `samples`	Drives the Samples parameter while connected
`duration`	primitive(number)	opt-in drives `duration`	Drives the Duration parameter while connected
`stall`	primitive(number)	opt-in drives `stall`	Drives the Stall Speed parameter while connected

Outputs

dataset(stack)

Parameters

Parameter	Kind	Default	Choices / range	Unit	Notes
Samples `samples`	int	`100`	2 to		⇄ port
Duration `duration`	float	none	0 to	h	⇄ port
Flow `flow`	choice	`with`	with \| against
Stall Speed `stall`	float	`1`	0 to	km / s	⇄ port
Line Values `values`	choice	`input`	input \| elapsed \| speed

Used by

Flow Along Lines Reconnection Between Steps

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