# arithmetic spiral

Definition from Wiktionary, the free dictionary

## Contents

## English[edit]

### Etymology[edit]

It is a spiral whose equation in polar coordinates is linear, which would thus, when quantized, yield an arithmetic progression.

### Noun[edit]

**arithmetic spiral** (*plural* **arithmetic spirals**)

- (mathematics) A spiral that increases in distance from the point of origin at a constant rate.
*The Parker spiral is the shape of the Sun's magnetic field as it extends through the solar system. Unlike the familiar shape of the field from a bar magnet, the Sun's extended field is twisted into an***arithmetic spiral**by the magnetohydrodynamic influence of the solar wind.^{[1]}