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The Earths AtmosphereI Harris and N W Spencer
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absorption acceleration altitude angle approximately atmosphere auroral auroral zone boundary chromosphere cloud collisions comet component corona decrease dipole direction distance distribution disturbances drift dust particles earth radii effect electric field electrojet emission emitted energy spectrum equation equatorial Explorer field lines flux frequency geoid geomagnetic field Geophys gravitational height hydrogen increase indicate intensity interplanetary magnetic field interplanetary medium interstellar ionization ionosphere km/sec magnetic storms magnetopause magnetosphere magnitude mass measurements mesosphere meteorites meteoroids meteorological meteors micron moon motion neutral neutron observed obtained occur orbit parameters period photographs photosphere plane plasma polar pressure produced protons radiation belt radio region rocket rotation satellite sensors shock shown in Figure solar activity solar cosmic rays solar flare solar nebula solar system solar wind spacecraft spectra stratosphere sunspot surface temperature theory tion trapped variations velocity wave wavelength zodiacal light