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Morphology of Auroral Displays
Optical Measurements of Auroras
Interaction of Energetic Charged Particles with
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airglow Akasofu Alaska altitude angle Atmos aurora and airglow auroral arcs auroral displays auroral echoes auroral forms auroral ionization auroral light auroral zone auroral-zone bands bombardment bremsstrahlung correlation detected detectors Doppler earth effects electron density electron flux electron precipitation energy excitation field lines Flin Flon frequency geomagnetic field geomagnetic storm geometry Geophys height homogeneous arcs hydrogen emission hydrogen lines instruments intensity ionosphere irregularities J. E. Evans Leadabrand low-energy luminosity magnetic disturbance magnetic field magnetic storms magnetosphere Mc/sec microbursts motions observations obtained occur Omholt optical peak phenomena photometer Phys Planet plasma polar aurora polar cap polar-glow aurora precipitated electrons protons radar radar echoes radiation radio range red arcs red aurora region riometer satellite measurements scintillation shown in Fig solar wind Space Sci spectra spectrogram studies temperature Terrest theory threshold trapped variation visual aurora wavelength x-ray bursts x-ray fluxes