Massive disturbance of the daytime lower ionosphere by the giant <i>γ</i>‐ray flare from magnetar SGR 1806–20
U. S. InanSpace, Telecommunications, and Radioscience Laboratory, Electrical Engineering Department Stanford University Stanford California USAN. G. LehtinenSpace, Telecommunications, and Radioscience Laboratory, Electrical Engineering Department Stanford University Stanford California USAR. C. MooreSpace, Telecommunications, and Radioscience Laboratory, Electrical Engineering Department Stanford University Stanford California USAK. HurleySpace Sciences Laboratory University of California Berkeley California USASteven E. BoggsSpace Sciences Laboratory University of California Berkeley California USADavid M. SmithDepartment of Physics University of California Santa Cruz California USAG. J. FishmanNASA Marshall Space Flight Center Huntsville Alabama USA
2007en
ABI
Аннотация
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 ∼10 3 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.
Перевод пока недоступен
Идентификаторы
Цитирования и источники
Цитирований: 2Использованных источников: 0