Radio-star visibility fades in Alaska near solar minimum.
Radio stars visibility fades observed in Alaska near solar minimum, discussing ionospheric optical depths
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Radio stars visibility fades observed in Alaska near solar minimum, discussing ionospheric optical depths
Radio star visibility fades relationship to line of sight auroral intensity
Occulting-filter technique allows several types of flashing-light visibility data necessary for rendezvous and docking maneuvers, to be obtained for studying the perception of flashes at the visual threshold. The indications are that the method can be used to compare sources of radically different spectral composition.
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