The STEL induction magnetometer network for observation of high-frequency geomagnetic pulsations

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The Solar-Terrestrial Environment Laboratory (STEL) induction magnetometer network has been developed to  investigate  the  propagation  characteristics  of  high-frequency  geomagnetic  pulsations  in  the  Pc1  frequency range (0.2–5 Hz). Five induction magnetometers were installed in the period 2005–2008 at Athabasca in Canada, Magadan and Paratunka in Far East Russia, and Moshiri and Sata in Japan. The sensitivity of these magnetometers is  between  0.3  and  13  V/nT  at  turnover  frequencies  of  1.7–5.5  Hz. GPS  time  pulses  are  used  for  accurate triggering of the 64-Hz data sampling. We show examples of PiB/Pc1 magnetic pulsations observed at these five stations, as well as the harmonic structure of ionospheric Alfven resonators observed at Moshiri. We found that the Pc1 packets are slightly modulated as they propagate from high to low latitudes in the ionospheric duct. These network observations are expected to contribute to our understanding of Pc1-range magnetic pulsations and their interaction with relativistic electrons by combining the obtained results with future satellite missions that observe radiation belt particles.

K. Shiokawa, R. Nomura, K. Sakaguchi, Y. Otsuka, Y. Hamaguchi, M. Satoh, Y. Katoh, Y. Yamamoto, B. M. Shevtsov, S. Smirnov, I. Poddelsky, and M. Connors. The STEL induction magnetometer network for observation of high-frequency geomagnetic pulsations. // Earth Planets Space, Vol. 62 (No. 6), pp. 517-524, 2010