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The Earths AtmosphereI Harris and N W Spencer
The IonosphereA C Aikin and S J Bauer
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absorption abundance altitude approximately atmosphere atoms auroral auroral zone cloud comet component core cosmic ray craters decrease dipole direction distance distribution earth earth's atmosphere effect electric field electron density emission emitted energy equation equilibrium exospheric field lines flare flux frequency galaxy geocentric orbits geomagnetic field Geophys gravitational heat helium hydrogen increase indicated intensity interior interplanetary interplanetary medium interstellar ionization ionosphere km/sec latitude layer luminosity magnetic field magnetopause magnetosphere magnitude mass measurements meteorites meteoroids meteors moon motion nebula neutron nuclear nucleus observed obtained occur optical orbit percent planets plasma polar pressure produced protons radiation radio sources radius reactions region result rocket rotation satellite shown in Figure solar activity solar cosmic rays solar nebula solar system solar wind space spectra spectrum star stellar storm surface temperature theory thermal tion ultraviolet variations velocity wavelengths waves X-ray zodiacal light