Magnetic Observatories
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
reference measurement.
An IMO must try to meet the
following minimum requirements:
Vector Magnetometer
| Resolution: |
0.1 nT |
| Dynamic Range: |
6000 nT Auroral & Equatorial
2000 nT Mid Latitude |
| Band Pass: |
DC to 0.1 Hz |
| Sampling Rate: |
.2 Hz (5 sec) |
| Thermal Stability: |
.25 nT/°C |
| Long Term stability: |
5 nT/year |
| Accuracy: |
±10 nT for 95% of
Reported data
±5 nT for Definitive data |
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.
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