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Unformatted text preview: (around 250 to 500 km). Most recent map of the Height of Maximum (hmF2) . The ionosphere above the peak electron concentration is usually referred to as the Topside Ionosphere. What is the Ionosphere Like Now? Select up-to-date information on: Real_Time Global Ionospheric Total Electron Content (updated every 15 minutes). Click here for more information about GPS and this innovative new ionospheric measurement technique from JPL Maximum Useable Frequency (MUF) of radio signals reflected by the ionosphere (updated every 30 minutes) Height of the Ionization Maximum (hmf2) (higher altitude reflection points for radio waves makes possible longer propagation paths (updated every 30 minutes...
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- Spring '09