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Massive disturbance of the daytime lower ionosphere by the giant γ-ray flare from magnetar SGR 1806–20
Space, Telecommunications, and Radioscience Laboratory, Electrical Engineering Department, Stanford University, Stanford, California, USA
Space, Telecommunications, and Radioscience Laboratory, Electrical Engineering Department, Stanford University, Stanford, California, USA
Space, Telecommunications, and Radioscience Laboratory, Electrical Engineering Department, Stanford University, Stanford, California, USA
Space Sciences Laboratory, University of California, Berkeley, California, USA
Space Sciences Laboratory, University of California, Berkeley, California, USA
Department of Physics, University of California, Santa Cruz, California, USA
NASA Marshall Space Flight Center, Huntsville, Alabama, USA
The giant γ-ray flare from SGR 1806-20 created a massive disturbance in the daytime lower ionosphere, as evidenced by unusually large changes in amplitude/phase of subionospherically propagating VLF signals. The perturbations of the 21.4 kHz NPM (Lualualei, Hawaii) signal observed at PA (Palmer Station, Antarctica) correspond to electron densities increasing by a factor of ∼100 to ∼103 cm−3 at ∼60 km and ≳1000 to ∼10 cm−3 at ∼30 km altitude. Enhanced conductivity produced by flare onset endured for >1 hour, the time scale determined by mutual neutralization. A brief (∼100 ms) low frequency (∼3 to 6 kHz) emission is also observed during the flare onset.
Received 19 December 2006; accepted 13 March 2007; published 21 April 2007.
Citation: (2007), Massive disturbance of the daytime lower ionosphere by the giant γ-ray flare from magnetar SGR 1806–20, Geophys. Res. Lett., 34, L08103, doi:10.1029/2006GL029145.
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