The effect of a gamma ray flare on Schumann resonances
We describe the ionospheric modification by the <I>SGR</I> 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 ex...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2012-09-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/30/1321/2012/angeo-30-1321-2012.pdf |
| Summary: | We describe the ionospheric modification by the <I>SGR</I> 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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| ISSN: | 0992-7689 1432-0576 |