= Geomagnetism Frequently Asked Questions by National Oceanic and Atmospheric Administration
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Official NCEI geomagnetism FAQ: https://www.ncei.noaa.gov/products/geomagnetism-frequently-asked-questions
The section on magnetic elements gives a representative terrestrial surface total-intensity range of about $25$–$65\,\mathrm{\mu T}$. This is not a specified orbital field measurement. The source separately identifies geographic variation and external magnetic contributions.
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