Physics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..445n&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, March 3, 1992, p. 445-448.
Physics
11
E Region, Ionospheric Electron Density, Particle Precipitation, Recombination Coefficient, Eiscat Radar System (Europe), Ionospheric Ion Density, Nocturnal Variations, Photometry
Scientific paper
A set of sudden increases followed by slow decay is observed in E-region electron density on December 17, 1990 using the Eiscat UHF-radar. Simultaneous photometer observations indicate that the density enhancements are caused by impulsive particle precipitation with short duration (4 +/- 1 s). Effective recombination-coefficient profiles in the E region are calculated from decaying electron densities using the continuity equation, and the results are compared with previous observations. It is pointed out that short-lived particle precipitation affects the ion composition in the E region, and therefore the effective recombination coefficient in this situation is different from the steady-state value.
Huuskonen Asko
Kaila K. U.
Nygrén T.
Turunen Tauno
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