To convert from **SI** units to **cgs** units for use in
*GM-SYS*, use the conversion table below. For example,
divide magnetization reported in A/m by 10³ for input into *GM-SYS*.

Quantity | cgs unit | SI Unit | Conversion |
---|---|---|---|

Magnetic field (B) |
gauss (G) | tesla (T) | 1 gauss=0.0001 T |

" | gamma [1] |
nanotesla (nT) [2] |
1 gamma [1] = 1 nT [2] |

Field intensity (H) |
oersted (Oe) | A/m | 1 oersted = 10³ / 4 A/m |

Magnetization (M) |
gauss [3] (G) |
A/m | 1 gauss [3] = 10³ A/m |

Susceptibility ( or S) |
dimensionless | dimensionless | 1 (cgs) = 4 (SI) |

Koenigsberger ratio (Q) |
dimensionless | dimensionless | 1 (cgs) = 1 (SI) |

[1] 1 gamma = 10^{-5} gauss[ 2] 1 nanotesla = 10^{-9} tesla[ 3] Also called emu/cm³. |
modified from Blakely (1995) |

Notes:

- Although susceptibility is dimensionless, it differs by a factor of 4 between the two systems.
- The defining equations above require Earth magnetic field values to
be given in oersted (
**cgs**) or A/m (**SI**). However in the geophysical literature, Earth magnetic field values are commonly given in gammas (**cgs**) or nanotesla (**SI**) which is what*GM-SYS*expects.