ナショナルジオグラフィックのインスタグラム(natgeo) - 1月12日 06時03分

Photograph by @simonnorfolkstudio
A crossed, full-wave dipole antenna, part of the ionospheric heating facility at the European Incoherent Scatter Scientific Association (EISCAT), Ramfjordmoen, near Tromsø in northern Norway. A vast field of antennae that pumps energy into the ionosphere and upper atmosphere to stimulate the Aurora Borealis.

There are 72 dipole antennae in this antenna field. These transmitters operate in the High Frequency range (3-30 MHz) at which radio waves are reflected back from the ionosphere to the ground. With such facilities a range of plasma turbulence phenomena can be excited in a semi-controlled fashion, during conditions when the ionosphere is naturally quiet and not perturbed by aurora. This stimulus-response type of research complements passive observations of the northern lights.

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@simonnorfolkstudio @ナショナルジオグラフィック
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image: @simonnorfolkstudio
words: @tribaleye

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