Magnetic Observatories (IMOs)
An INTERMAGNET Magnetic Observatory (IMO) is a magnetic observatory, having full absolute control, that provides one minute magnetic field values measured by a vector magnetometer, and an optional scalar magnetometer, all with a resolution of 0.1 nT. Vector measurements performed by a magnetometer must include the best available baseline.
An IMO must try to meet the following minimum requirements:
Vector Magnetometer
| Resolution | 0.1nT |
|---|---|
| Dynamic Range |
8000 nT Auroral and Equatorial 6000 nT Mid Latitude |
| Band Pass | DC to 0.1 Hz |
| Sampling Rate | 1 Hz (1 sec) |
| Thermal Stability | 0.25 nT/°C |
| Long Term stability | 5 nT/year |
Scalar Magnetometer
| Resolution | 0.1nT |
|---|---|
| Sampling Rate | 0.033 Hz (30 sec) |
| Accuracy | 1 nT |
Further details on IMO requirements are described in the INTERMAGNET Technical Reference Manual.
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