94.00.00 Physics of the ionosphere and magnetosphere
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94.05.-a Space plasma physics (see also 96.50.-e Interplanetary physics)
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- 94.20.-y Physics of the ionosphere (for ionospheres of the planets, see 96.12.ji and 96.15.hk in Geophysics Appendix; for radiowave propagation, see 41.20.Jb-in electromagnetism)
- 94.30.-d Physics of the magnetosphere
- 94.80.+g Instrumentation for space plasma physics, ionosphere, and magnetosphere
- 94.90.+m Other topics in space plasma physics, physics of the ionosphere and magnetosphere (restricted to new topics in section 94)