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- W2023162480 abstract "On the evening of 13 January 1983 we made simultaneous observations of optical and radar aurora using low light television cameras together with the EISCAT radar system. At 19 h 16 m 06 s UT an extremely bright auroral arc moved rapidly (about 2 km s−1) through the EISCAT radar beam. The associated rapid rise and fall in the E-region electron density indicates that there was an intense narrow electron beam associated with the optical arc. We estimate that the ionisation rate in the E-region increased at least 20-fold (from 1 × 1010 m−3 s−1 to >2 x 1011 m−3 s−1) for 1 or 2 s as the arc passed by. In addition, there was a brief (<4 s) increase of 130% in the signal returned from 250 km altitude which coincided with the arc crossing the radar beam at that height. In view of this coincidence, we find that a possible explanation is that the increase arose from short-lived molecular ions, for example vibrationally excited N+2 ions, produced in the F-region by soft precipitation associated with the arc." @default.
- W2023162480 created "2016-06-24" @default.
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- W2023162480 date "1987-01-01" @default.
- W2023162480 modified "2023-09-23" @default.
- W2023162480 title "A narrow auroral arc observed with EISCAT" @default.
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- W2023162480 doi "https://doi.org/10.1016/0021-9169(87)90081-x" @default.
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