Oersted

[3] The unit was established by the IEC in the 1930s[4] in honour of Danish physicist Hans Christian Ørsted.

[clarification needed][6] The oersted is ⁠1000/4π⁠ (≈79.5775) amperes per meter, in terms of SI units.

[7][8][9][10] The H-field strength inside a long solenoid wound with 79.58 turns per meter of a wire carrying 1 A is approximately 1 oersted.

The preceding statement is exactly correct if the solenoid considered is infinite in length with the current evenly distributed over its surface.

The oersted is closely related to the gauss (G), the CGS unit of magnetic flux density.

Cassette tape label with coercivity (a measure of the external magnetic flux required to magnetize the tape) measured in oersteds