Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3357i&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 22, p. 3357-3360
Astronomy and Astrophysics
Astrophysics
32
Ionosphere: Ionization Mechanisms, Ionosphere: Ionospheric Disturbances, Ionosphere: Solar Radiation And Cosmic Ray Effects, Solar Physics, Astrophysics, And Astronomy: X Rays, Gamma Rays, And Neutrinos
Scientific paper
A gigantic periodic flare from the soft γ repeater SGR 1900+14 produced enhanced ionization at ionospheric altitudes of 30 to 90 km, which was observed as unusually large amplitude and phase changes of very low frequency (VLF) signals propagating in the Earth-ionosphere waveguide. The VLF signals remained perturbed for ~5 min and exhibited the 5.16 s periodicity of the giant flare detected on the Ulysses spacecraft [Hurley et al., 1999]. Quantitative analysis indicates the presence of an intense initial low energy (3-10 keV) photon component that was not detectable by the Ulysses instrument.
Bell Timothy F.
Hurley Kevein
Inan Umran S.
Johnson Matthew P.
Lehtinen Nikolai G.
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