Statistics – Computation
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.508..485k&link_type=abstract
In: Proceedings of the SOHO 11 Symposium on From Solar Min to Max: Half a Solar Cycle with SOHO, 11-15 March 2002, Davos, Switze
Statistics
Computation
Earth Ionosphere, Solar Activity
Scientific paper
Observations of resonance electromagnetic fields orginating in world-wide centres of thunderstorm activity can be employed in determining averaged parameters of the lower ionosphere. To find from this kind of data the propagation parameters in Earth-ionosphere waveguide we have used to the analysis of our Schumann resonance measurements carrying on irregularly from 6 years the propagation model basing on two dimensional telegraph equation (TDTE) described in our first paper. The model allows for the computation of the attenuation rate of the Earth-ionosphere waveguide from diurnal observations of the magnetic component of ELF field in the 4-24 Hz range. As the measurements were carried on in time of the minimum and the maximum of the solar cycle 23 we present how the ELF attenuation rate in Earth-ionosphere cavity change with solar activity. The analysis of all the obtained data indicates that the global mean attenuation rate α at 8 Hz change its value from 0.315 dB/Mm at the solar minimum to about 0.275 dB/Mm at the solar maximum.
Kubisz J.
Kulak Andrzej
Michalec A.
Michalek Gregory
Zieba St.
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