Physics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992stin...9331624p&link_type=abstract
Unknown
Physics
Incoherent Scattering, Metal Ions, Meteoroids, Sporadic E Layer, Aeronomy, Eiscat Radar System (Europe), Ionization, Meteoroid Showers, Trajectories, Wave Scattering
Scientific paper
A study using incoherent scatter measurements during strong meteor showers, which addresses the many physical processes needed on the way for meteors to thin layers consisting of metals or alkali metals in the ionospheric E region, is reviewed. Meteors are considered to deposit elements which are layered into a broad metallic belt in the ionospheric E region extending over the whole Earth. Occasionally very thin and strong layers of, for example, iron or magnesium ions or sodium atoms appear. There exist several theories for thin layer compression from these elements, but none of them is fully satisfactory in explaining all the observations. The incoherent scatter method is efficient for studying the ion layers and their properties. The neutral layers cannot be detected by this method, but meteors can be observed. Radio waves reflect in different ways from head on collisions with meteors and the diffusing long lived ionized columns after meteor impacts. The possibility of identifying meteor head echoes from EISCAT data is discussed.
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