Riometer radio antennae array at Poker Flat Research Range (PFRR),Alaska,USA. A riometer is used in polar regions to study aurorae,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. This riometer is a 16x16 array of 256 radio antennae. Riometer stands for Relative Ionospheric Opacity Meter using Extra-Terrestrial Electromagnetic Radiation. As the coloured light displays of the aurorae (visible at night) block the passage of radio waves from space to the Earth,they show up as shadows on the riometer display. PFRR is part of the University of Alaska | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Sirulnikoff, Alan |
Bildgröße: | 3515 px × 2480 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |