### field lines

(lines showing the pattern of a mathematical field)

**Field lines** are imaginary lines showing the direction of
vectors in a (mathematical) vector field (as well as any physical
field the mathematical field represents), often included in
illustrations of fields. In an illustration, labeling might reveal
which of the two possible directions the vectors are pointed, since
simple lines don't reveal that. Field lines are commonly used to
illustrate magnetic fields and often the term is used to describe
phenomena that follow paths that could form a field line, e.g.,
"along the field lines, ...". A simple experiment of a magnet under
a piece of paper with (tiny stick-like) iron filings sitting on top
results in the filings illustrating the field in a "field line"
manner.

Field lines can also be used to illustrate other mathematical and
physical fields, including electric fields and gravitational fields.

(*physics,mathematics,gravity,electromagnetism*)
**Further reading:**

http://en.wikipedia.org/wiki/Field_line

**Referenced by pages:**

Alfvén wave

curvature radiation

flux freezing

magnetic anomaly

pulsar (PSR)

sunspot

Sun surface features

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