Physics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jatp...49...49h&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 49, Jan. 1987, p. 49-55.
Physics
2
Auroral Arcs, Eiscat Radar System (Europe), Radio Auroras, E Region, Ionospheric Electron Density, Molecular Excitation, Molecular Ions, Nitrogen Ions
Scientific paper
On the evening of Jan. 13, 1983, simultaneous observations of optical and radar aurora were made 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) 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. It is estimated that the ionization rate in the E-region increased at least 20-fold (from 1 x 10 to the 10th/cu m per s to greater than 2 x 10 to the 11th/cu m per s) for 1 or 2 s as the arc passed by. In addition, there was a brief (less than 4 s) increase of 130 percent 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, it is found 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.
Hapgood M. A.
Lanchester B. S.
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