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  • 1. Fornieles-Callejon, J.
    et al.
    Salinas, A.
    Toledo-Redondo, Sergio
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Porti, J.
    Mendez, A.
    Navarro, E. A.
    Morente-Molinera, J. A.
    Soto-Aranaz, C.
    Ortega-Cayuela, J. S.
    Extremely low frequency band station for natural electromagnetic noise measurement2015In: Radio Science, ISSN 0048-6604, E-ISSN 1944-799X, Vol. 50, no 3, p. 191-201Article in journal (Refereed)
    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.

  • 2. Salinas, Alfonso
    et al.
    Porti, Jorge
    Fornieles, Jesus
    Toledo Redondo, Sergio
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
    Navarro, Enrique A.
    Morente-Molinera, Juan A.
    TLM Nodes: A New Look at an Old Problem2015In: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 63, no 8, p. 2449-2458Article in journal (Refereed)
    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.

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