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 & 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:
0.1 nT
Sampling Rate:
0.033 Hz (30 sec)
Accuracy:
1 nT
Further details on IMO requirements are described in the INTERMAGNET Technical Reference Manual.
