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- W158697669 abstract "We develop a method of diagnostics of magnetospheres of soft gamma-ray repeaters (SGRs) using high-frequency (20-2400 Hz) quasi-periodic pulsations (QPOs)[14]. The trapped fireball is represented as a set of current-carrying loops, equivalent RLC-circuits, rooted into a neutron star surface. The model explains the observed periods of QPOs and their high quality factor Q ≈ 104-105. The parameters of the source of the pulsations at the «ringing tail» stage for three well-known giant SGR flares are determined: the electric current I≈ (2-8)×1019 A, the magnetic field B ≈ (0.6-2.7)×1013 G < BQ, and the electron number density n ≈ (1.3-6.0)×1016 cm-3. We also show that high-frequency QPOs can be self-excited for an electric current smaller than the maximum current in the giant pulse of the flare, and/or due to the parametric resonance. The result is consistent with the conclusion made by Rea et al.[11] that a high surface magnetic field is not necessarily required for the magnetar activity." @default.
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- W158697669 date "2013-01-01" @default.
- W158697669 modified "2023-10-16" @default.
- W158697669 title "Diagnostics of SGR Magnetospheres Using Coronal Seismology" @default.
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