Massive disturbance of the daytime lower ionosphere by the giant γ-ray flare from magnetar SGR 1806-20

Details Massive disturbance of the daytime lower ionosphere by the giant γ-ray flare from magnetar SGR 1806-20 Massive disturbance of the daytime lower ionosphere by the giant γ-ray flare from magnetar SGR 1806-20

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3408103i&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 8, CiteID L08103

Astronomy and Astrophysics

Astrophysics

11

Atmospheric Composition And Structure: Ion Chemistry Of The Atmosphere (2419, 2427), Ionosphere: Ionization Processes (7823), Ionosphere: Ionospheric Disturbances, Solar Physics, Astrophysics, And Astronomy: X-Rays, Gamma Rays, And Neutrinos

Scientific paper

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.

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