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High-latitude artificial aurora using the EISCAT high-gain HF facility

Research output: Contribution to conference Other

Publication date08/2002
Number of pages4
<mark>Original language</mark>English


Conference29th General Assembly of the International Union of Radio Science
Period1/01/00 → …


The EISCAT high-frequency (HF) transmitter facility at Ramfjord, Norway, has been used to accelerate F-region electrons sufficiently to excite the oxygen atoms and nitrogen molecules, resulting in optical emissions at 630, 557.7 and 427.8 nm. During O-mode transmissions at 5.423 MHz, using 630 MW effective radiated power, in the hours after sunset on 12 November 2001 several new observations were made, including: (1) The first high-latitude observation of an HF induced optical emission at 427.8 nm and (2) Optical rings being formed at HF on followed by their collapse into a central blob. Both discoveries remain unexplained with current theories.

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