Computer Science – Sound
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jatp...48..643v&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 48, July 1986, p. 643-648. FINEP-supported research.
Computer Science
Sound
1
Diurnal Variations, Lower Ionosphere, Meteoroid Showers, Plasma-Electromagnetic Interaction, Very Low Frequencies, Geomagnetism, Ionospheric Sounding, Plasma Physics
Scientific paper
The effect of the Geminids and alpha Scorpiids meteor showers in the lower ionosphere have been observed using two different methods. Low ionosphere group heights, measured by a VLF ionosonde located in southern Brazil, indicated significant anomalous lowering of the effective reflection height which was in good correlation with the transit of the alpha Scorpiids stream. The diurnal VLF phase variations over two long-distance propagation paths showed significant phase deviations from the average during the transits of the showers' radiants. Geomagnetic activity during the periods concerned was low and the results obtained using the two different techniques confirm the occurrence of changes in the physical conditions of the low ionosphere produced by meteor showers on local, as well as on long-distance, scales.
Macedo Moura S. S. M.
Mendes da Costa Aracy
Paes Leme N. M.
Rizzo Piazza Liliana
Vilas Boas W. S. J.
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