Subjects: AURORAS; BIRKELAND, Kristian; ATMOSPHERIC physics
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Subjects: AURORAS; ASTRONOMY; ATMOSPHERIC physicsALASKA; POLAR regions; UNITED States
Subjects: HALOS (Meteorology); ASTRONOMICAL observations; ASTRONOMY
Subjects: AURORAS; ATMOSPHERIC physics; SCIENCE projects
Subjects: AURORAS; ATMOSPHERIC spectra; ASTRONOMICAL observations
Subjects: SOLAR flares; SOLAR activity; AURORAS