Riometer information board

Riometer information board

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This image is part of the feature Poker Flat Aurora Research

Credit: ALAN SIRULNIKOFF/SCIENCE PHOTO LIBRARY

Caption: Riometer information board at Poker Flat Research Range (PFRR), Alaska, USA. A riometer is used in polar regions to study aurorae, the solar-induced electromagnetic storms of the polar ionosphere. The ionosphere is a region of the upper atmosphere that lies 50-600 kilometres above Earth's surface. A riometer is an array of radio antennae. Riometer stands for Relative Ionospheric Opacity Meter using Extra-Terrestrial Electromagnetic Radiation. As the glowing displays of the aurorae (visible at night) block the passage of radio waves from space to the Earth, they will be seen as shadows on the riometer output screen. PFRR is operated by the University of Alaska's Geophysical Institute.

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Keywords: america, american, antenna array, arctic, astronomy, astrophysics, atmosphere, atmospheric, aurora, aurorae, auroral, board, climate, display, electromagnetic radiation, geophysics institute, imaging, information, ionosphere, meter using extra-terrestrial, northern lights, pfrr, poker flat research range, polar, radio, relative ionospheric opacity, riometer, sign, space, tourist, united states, university of alaska, us, usa

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