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Toledo-Redondo, Sergio
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Publications (2 of 2) Show all publications
Fornieles-Callejon, J., Salinas, A., Toledo-Redondo, S., Porti, J., Mendez, A., Navarro, E. A., . . . Ortega-Cayuela, J. S. (2015). Extremely low frequency band station for natural electromagnetic noise measurement. Radio Science, 50(3), 191-201
Open this publication in new window or tab >>Extremely low frequency band station for natural electromagnetic noise measurement
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2015 (English)In: Radio Science, ISSN 0048-6604, E-ISSN 1944-799X, Vol. 50, no 3, p. 191-201Article in journal (Refereed) Published
Abstract [en]

A new permanent ELF measurement station has been deployed in Sierra Nevada, Spain. It is composed of two magnetometers, oriented NS and EW, respectively. At 10 Hz, their sensitivity is 19 V/pT and the signal-to-noise ratio (SNR) is 28 dB for a time-varying signal of 1 pT, the expected field amplitude in Sierra Nevada. The station operates for frequencies below 24 Hz. The magnetometers, together with their corresponding electronics, have been specifically designed to achieve such an SNR for small signals. They are based on high-resolution search coils with ferromagnetic core and 10(6) turns, operating in limited geometry configuration. Different system noise sources are considered, and a study of the SNR is also included. Finally, some initial Schumann resonance measurements are presented in order to validate the performance of the measurement station, including 1 h length spectra, daily variations of resonance amplitudes and frequencies for the different seasons, and a 3 day spectrogram.

Keywords
ELF station, Schumann resonance
National Category
Meteorology and Atmospheric Sciences Astronomy, Astrophysics and Cosmology Geophysics Geochemistry Remote Sensing
Identifiers
urn:nbn:se:uu:diva-253271 (URN)10.1002/2014RS005567 (DOI)000353686900002 ()
Available from: 2015-05-25 Created: 2015-05-25 Last updated: 2017-12-04Bibliographically approved
Salinas, A., Porti, J., Fornieles, J., Toledo Redondo, S., Navarro, E. A. & Morente-Molinera, J. A. (2015). TLM Nodes: A New Look at an Old Problem. IEEE transactions on microwave theory and techniques, 63(8), 2449-2458
Open this publication in new window or tab >>TLM Nodes: A New Look at an Old Problem
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2015 (English)In: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 63, no 8, p. 2449-2458Article in journal (Refereed) Published
Abstract [en]

In this paper, an alternative perspective on the transmission line modeling (TLM) method concepts to unify previous work is presented. The procedure begins by discretizing Maxwell's equations and proposing TLM equivalent models. Node voltage and mesh current definitions are provided in terms of link line contributions, compatible with stub currents and voltages. They allow obtaining an expression that relates incident and reflected pulses with no other condition required. With this unified approach, modeling of other situations is straightforward. 2-D cases, source implementation, and anisotropic media are described and numerically tested.

Keywords
Transmission line modeling (TLM) method
National Category
Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:uu:diva-261972 (URN)10.1109/TMTT.2015.2446972 (DOI)000359370900007 ()
Available from: 2015-09-08 Created: 2015-09-07 Last updated: 2017-12-04Bibliographically approved
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