Meteor showers effects in the low terrestrial ionosphere detected at VLF ionosonde and long distance propagation paths

Details Meteor showers effects in the low terrestrial ionosphere detected at VLF ionosonde and long distance propagation paths Meteor showers effects in the low terrestrial ionosphere detected at VLF ionosonde and long distance propagation paths

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984stin...8435246v&link_type=abstract

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Computer Science

Sound

Aquarid Meteoroids, Geminid Meteoroids, Ionospheric Propagation, Ionospheric Sounding, Low Frequencies, Lower Ionosphere, Diurnal Variations, Ionosondes, Ionospheric Electron Density, Mathematical Models, Phase Deviation, Variance (Statistics), Wave Reflection

Scientific paper

The effect of Geminids and eta Aquarids meteor showers in the lower ionosphere were observed using two different methods. Low ionosphere group heights measured by a very low frequency ionosonde located south of Brazil indicated an anomalous lowering of the effective reflection height and presented night-time 5 sigma deviation in good correlation with Eta Aquarids stream transit. The group reflection coefficients present a very pronounced variation reaching values 3 sigma below the normal values. Diurnal very low frequency phase variations in two long-distance propagation paths present night-time 7 sigma and 4 sigma phase deviations from the average during the Eta Aquarids shower transit. The Geminids shower effect in the lower ionosphere was detected in two different long distance very low frequency propagation paths: NAA, Culter, U.S.A. - Atibaia, S.P., Brazil presented 5 sigma phase deviation and ARG, Argentina - Atibaia, S.P., Brasil presented 3.5 sigma phase deviation from the average. The geomagnetic activity in the periods covered by this investigation was low and the results obtained are a confirmation through two different techniques of changes in the physical conditions of the low ionosphere by meteor shower.

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