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Official NCEI geomagnetism FAQ: www.ncei.noaa.gov/products/geomagnetism-frequently-asked-questions

The section on magnetic elements gives a representative terrestrial surface total-intensity range of about $25$–$65\mu \mathrm{T}$. This is not a specified orbital field measurement. The source separately identifies geographic variation and external magnetic contributions.

Official NOAA Jetstream explanation of temperature-defined atmospheric layers and their heating. www.noaa.gov/jetstream/atmosphere/layers-of-atmosphere