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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 30, issue 9
Ann. Geophys., 30, 1321–1329, 2012
https://doi.org/10.5194/angeo-30-1321-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 30, 1321–1329, 2012
https://doi.org/10.5194/angeo-30-1321-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

  07 Sep 2012

07 Sep 2012

The effect of a gamma ray flare on Schumann resonances

A. P. Nickolaenko1, I. G. Kudintseva2, O. Pechony3, M. Hayakawa4, Y. Hobara5, and Y. T. Tanaka6 A. P. Nickolaenko et al.
  • 1Usikov Institute for Radio-Physics and Electronics, National Academy of Sciences of the Ukraine, 12, Acad. Proskura Street, Kharkov 61085, Ukraine
  • 2Karasin Kharkov National University, 4, Svoboda sq., Kharkov 61077, Ukraine
  • 3NASA Goddard Institute for Space Studies and Columbia University, New York, NY, USA
  • 4Advanced Wireless Communications Research Center and Research Station on Seismo Electromagnetics, The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan
  • 5The University of Electro-Communications, Graduate School of Informatics and Engineering, 1-5-1 Chofugaoka, Chofu Tokyo 182-8585, Japan
  • 6Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa, 229-8510, Japan

Abstract. We describe the ionospheric modification by the SGR 1806-20 gamma flare (27 December 2004) seen in the global electromagnetic (Schumann) resonance. The gamma rays lowered the ionosphere over the dayside of the globe and modified the Schumann resonance spectra. We present the extremely low frequency (ELF) data monitored at the Moshiri observatory, Japan (44.365° N, 142.24° E). Records are compared with the expected modifications, which facilitate detection of the simultaneous abrupt change in the dynamic resonance pattern of the experimental record. The gamma flare modified the current of the global electric circuit and thus caused the "parametric" ELF transient. Model results are compared with observations enabling evaluation of changes in the global electric circuit.

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