Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa43b1761c&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA43B-1761
Physics
[2403] Ionosphere / Active Experiments, [2435] Ionosphere / Ionospheric Disturbances, [6929] Radio Science / Ionospheric Physics, [7944] Space Weather / Ionospheric Effects On Radio Waves
Scientific paper
Cosmic gamma-ray bursts ionize the upper atmosphere, affecting sub-ionospheric propagation of very-low-frequency (VLF) radio waves. Perturbations of VLF radio signals can therefore be used to study gamma-ray burst effects on the ionosphere. We present observations of VLF radio signal perturbations coincident with bursts observed by the Fermi satellite to be produced by soft gamma-ray repeater (SGR) 1550-5418 on January 22, 2009. Massive VLF signal amplitude perturbations as large as 15 dB are seen coincident with the gamma-ray events. Models of gamma-ray ionization and chemical recovery of the upper atmosphere are then used to drive simulations of VLF radio propagation. Simulation results are compared to the observed radio data and to Fermi gamma-ray observations and are used to constrain the properties of the ionosphere and the gamma-ray events.
Carlson Barbara E.
Chaplan V.
Cohen Martin
Fishman Gerald J.
Inan Umran S.
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