Computer Science – Sound
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....12238m&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #12238
Computer Science
Sound
Scientific paper
The study of the propagation of Extremely Low Frequency (ELF) waves is essential for the electromagnetic sounding investigations planned for some of the future Martian missions, e.g. NetLander. Future surface stations will have the possibility of continuous recording of the low frequency electromagnetic field fluctuations. Natural electromagnetic waves may be produced near the surface by electrostatic discharges in dust storms (dust devils) or geological activity and can be trapped in the resonant cavity formed by the surface and upper ionosphere. Low frequency electromagnetic waves can also travel along the magnetic field lines of the recently discovered magnetic anomalies from the magnetosphere to the surface and may produce resonant structures in the cavity. The measurements of resonant frequencies, also called Schumann frequencies, by ground stations can be used for remote sensing of the electrical conductivity of the lower ionosphere/atmosphere. The structure of the Schumann resonances is mainly determined by the geometry of the cavity and the global electrical conductivity of the ionosphere/atmosphere. We present a numerical model of electromagnetic wave propagation based on the Transmission Line method (TLM) with the aim of calculating the resonance frequencies on Mars. First the model is validated by application to the terrestrial case where the numerical results obtained are very close to the experimental ones which supports our predictions on Mars. The same model can be used to estimate the global electrical conductivity using future real measurements of ground stations or even balloons on Mars.
Besser Bruno Philipp
Eichelberger H. U.
Lichtenegger Herbert I. M.
Margineda J.
Molina-Cuberos Gregorio J.
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