Low-frequency (ULF/ELF/VLF) radio polarimetry and some applications

Jack Y. Dea; Peder M. Hansen; Wolfgang-Martin Boerner

doi:10.1117/12.140621

12 February 1993 Low-frequency (ULF/ELF/VLF) radio polarimetry and some applications

Jack Y. Dea, Peder M. Hansen, Wolfgang-Martin Boerner

Proceedings Volume 1748, Radar Polarimetry; (1993) https://doi.org/10.1117/12.140621
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

Polarimetry covers the entire electromagnetic spectrum and 'Low Frequency Polarimetry' applies to the polarimetric vector field nature of the magnetic and electric fields within the Ultra-Low Frequency (ULF: below 3 Hz), the Extremely Low Frequency (ELF: 3 Hz to 3 kHz) and the Very-Low Frequency (VLF: 3 kHz to 30 kHz) spectral regions. The acoustic complementary spectral regions are identified as Infrasonic (.01 - to 20 Hz) and Audiosonic (20 Hz - to - 20 kHz). These low frequency waves play an important role in coupled lithospheric-ionospheric wave interaction especially in the upper ULF (above .01 Hz) to lower VLF (below 10 kHz) for which the radiowaves display pronounced polarimetric effects, i.e., strong field component dependence. In this paper, an introduction to this exciting re-emerging field is presented, paying major emphasis on recent findings regarding the observation of elevated electromagnetic low frequency noise, strongly peaking in the 0.1 to 5 Hz spectral region before an earthquake seismic distress event. Also, polarimetric signatures resulting from the interaction of large space vehicles with the ionosphere will be discussed.

Citation Download Citation

Jack Y. Dea, Peder M. Hansen, and Wolfgang-Martin Boerner "Low-frequency (ULF/ELF/VLF) radio polarimetry and some applications", Proc. SPIE 1748, Radar Polarimetry, (12 February 1993); https://doi.org/10.1117/12.140621

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