Schumann resonance measurements data available upon request


This research study regarding the ELF spectrum and specifically the Schumann Resonances has started in 2012.
This project is funded by the 
Mariolopoulos-Kanaginis Foundation for the Environmental Sciences and implemented in the Electronics-Telecommunications and Applications Laboratory 
of the Physics Department in the
University of Ioannina.

A special electronic system able to detect, record and analyze the spectrum in the lower ELF range has been developed and used to produce the measurement results presented in this site.
The viewer may find more information and details in the papers at the bottom of this page that have been published so far.  Measurements include 24-hour spectrograms,
individual spectra of 10-minute recordings and variations of the calculated parameters that are the resonance frequency, the Q-factor and the power of of Schumann Resonances.
The parameters are extracted using a Lorentzian fitting model.

 Up to six modes are detectable. Currently only the magnetic field of the ELF spectrum is measured using magnetic coils. As of August 2017 our system is monitoring both the two horizontal magnetic field components.
Our system has been installed in two locations. The main measurements come from 
Kalpaki. A secondary location at Neochori has also been used.


 Votis, C., Tatsis, G., Christofilakis, V., Chronopoulos, S., Kostarakis, P., Tritakis, V. and Repapis, C. (2018). A new portable ELF Schumann resonance receiver: design and detailed analysis of the antenna and the analog front-end. EURASIP Journal on Wireless Communications and Networking, 2018(1).

Schumann resonance oscillation detection is a complex procedure which requires customized and high-quality measurement systems. The primary objective of this work was to design and implement a stand-alone, portable, and low-cost receiver able to measure as much Schumann resonance harmonics as possible. Design, as well as detailed analysis of the efficient induction coil magnetic antenna and the low-noise amplifying-filtering chain, is presented. The detection system includes two coils back to back, resulting in a total coil length of 60 cm. The filtering and amplification chain exhibits an experimentally measured total passband gain equal to 112 dB at 10 Hz and as low as 2.88 nV/Hz equivalent input noise. In order to validate the new portable ELF Schumann resonance detection and monitoring system, we took measurements at various spots “relatively” free from man-made electromagnetic pollution. Results have shown very clear Schumann resonance peaks for the first six modes with 10-min acquisition time.

Analog front end of the Extremely low frequency station at Ioannina in Greece for the measurement of Schumann resonances

In  this  paper  A  portable  detection  system  for  Schumann  resonances  (SR)  measurements  is  presented.  SR  are  ELF  natural  electromagnetic  eigenmodes  in  Earth-ionosphere  cavity.   These   electromagnetic   waves   have   been   suggested   to   monitor  climate,  electrical  activity  in  the  atmosphere  and  other  earth  -  atmosphere  phenomena  providing  observations  of  great  importance.   In   the   present   work,   we   studied   the   antenna   structure and the electronic set-up to achieve high sensitivity and long  term  monitoring  of  SR  magnetic  field  components.  The  corresponding  calculated  and  measured  results  focus  on  the  whole     system     performance     enhancement.     A     series     of     measurements  taken  in  a  spot  at  the  prefecture  of  Ioannina  Greece,   indicate   that   our   measurement   set-up   can   reliably   measure up to 6 harmonics in SR spectrum, efficiently.

"A Prototype Data Acquisition and Processing System for Schumann Resonance Measurements", Giorgos Tatsis, Constantinos Votis, Vasilis Christofilakis, Panos Kostarakis, Vasilis Tritakis, Christos Repapis. Journal of Atmospheric and Solar-Terrestrial Physics, Nov 2015, doi:10.1016/j.jastp.2015.11.001
In this paper, a cost-effective prototype data acquisition system specifically designed for Schumann resonance measurements and an adequate signal processing method are described in detail. The implemented system captures the magnetic component of the Schumann resonance signal, using a magnetic antenna, at much higher sampling rates than the Nyquist rate for efficient signal improvement. In order to obtain the characteristics of the individual resonances of the SR spectrum a new and efficient software was developed. The processing techniques used in this software are analyzed thoroughly in the following. Evaluation of system’s performance and operation is realized

“Design and implementation of Schumann resonances sensor platform”, C. I. Votis, Giorgos Tatsis, Vasilis Christofilakis, Panos Kostarakis,Vasilis Tritakis and Christos Repapis, Journal of Engineering Science and Technology Review, ISSN: 1791-932

The principal objective of this paper is to present a Schumann resonances detection and measurements platform. Studies and investigation on Schumann resonances are suggested in several research activities that aim to monitor climate, earth and atmospheric phenomena. Schumann oscillations are natural electromagnetic eigenmodes at ELF frequency range.Design and implementation of the proposed platform are based on principal theoretical considerations and laboratory

observations including initialization, test measurements and calibration. The proposed measurement platform is an efficient and versatile set-up for experimental detection and measurements on Schumann resonances magnetic field components. Several preliminary outdoor measurements have already conducted, providing principal results that ensure efficient and reliable performance.

 “Preliminary Measurements of Schumann’s Resonances (SR) in the Greek Area.” Giorgos Tatsis, Constantinos I. Votis, Vasilis Christofilakis, Panos Kostarakis, Vasilis Tritakis, Christos Repapis and Pantelis Kalavrezos, , Journal of Engineering Science and Technology Review, Vol.9, Issue 4,  pp 61-64, 2016.

Schumann’s Resonance (SR) measurements have been collected in the wider area of Ioannina by an equipment,designed and built in the laboratory of electronics and telecommunication of the University of Ioannina. Remarkable differences among measurements received in various epochs have been detected. At first, SR intensities taken around the Summer solstice are weaker than those taken around the Winter one, while SR intensities close to the Spring equinox are higher than those close to the Autumn equinox, on the average. Another obvious remark is a specific correlation between the SR intensity and the geomagnetic index Dst. Negative values of this index, which imply adisturb geomagnetic environment, correlate better with low SR intensity values. In the opposite, positive Dst values correspond to higher SR intensities. In general, the relative position of the Sun in relation to the earth as well as the solar/geomagnetic activity seems to affect the SR signals profile.