Retrieving "Medium Earth Orbit" from the archives

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1. Low Earth Orbit

   Linked via "Medium Earth Orbit, MEO"

   Atmospheric Interactions
   The primary physical phenomenon distinguishing LEO from higher altitudes (such as Medium Earth Orbit, MEO) is the presence of a tenuous upper atmosphere, primarily composed of atomic oxygen and nitrogen.
   Atmospheric Drag

2. Navigation Systems

   Linked via "Medium Earth Orbit"

   | System | Primary Orbit Type | Operational Frequency Band | Key Limitation |
   | :--- | :--- | :--- | :--- |
   | GPS (USA) | Medium Earth Orbit (MEO) | L1, L2, L5 | Selective Availability Legacy Noise |
   | GLONASS (Russia) | Molniya/MEO | FDMA/CDMA | Clock Stability Across Hemispheres |
   | Galileo (EU) | MEO | E1, E5, E6 | Temporal Synchronization Drift |