Global Observatory Network Geomagnetic Field Measurements

INTERMAGNET provides minute-by-minute and definitive measurements of the Earth's magnetic field from a global network of observatories. Data is collected by participating Geomagnetic Information Nodes (GINs) and made available as preliminary 'reported' data and later as processed 'definitive' data. The network supports both near-real-time data dissemination and annual CD-ROM publications.

Use Cases

• Modeling space weather impacts by analyzing time-series variations in the definitive magnetic field data.
• Detecting geomagnetic anomalies by comparing reported data streams from multiple observatory locations.
• Training forecast models using minute-mean data (IMF V1.22 format) to predict magnetic disturbance indices.
• Calibrating satellite magnetometer data using definitive baseline values from ground observatories.

Strengths

• Global spatial coverage from the International Real-time Magnetic Observatory Network.
• Provides both near-real-time preliminary data and annually published definitive, quality-controlled data.
• Multiple standardized data formats (e.g., IMF V1.22, IAGA2002) for different analysis needs.

Limitations

• Definitive data has a latency of typically several months after the end of each year.
• Preliminary data from remote observatories may not be available for several days.
• Data availability and policies are dependent on individual Geomagnetic Information Nodes (GINs).

Provenance

Source

International Real-time Magnetic Observatory Network (INTERMAGNET).

Collection Method

Continuous automated recordings of magnetic field variations combined with periodic manual absolute field measurements at global observatories.

Time Range

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Freshness

Preliminary data is generally available for the day previous to the current one; definitive data is updated annually.

Geography

Global coverage from participating magnetic observatories worldwide.