Statistics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh31a1177r&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SH31A-1177
Statistics
7847 Radiation Processes, 7871 Waves And Instabilities, 6984 Waves In Plasma, 2159 Plasma Waves And Turbulence, 0689 Wave Propagation (4275)
Scientific paper
Burstiness of observed wave emissions and related processes in space plasmas has been addressed via various stochastic theories of wave growth. These include elementary burst theories (EBT) of solar microwave spike bursts, and stochastic growth theory (SGT) of type II and III radio bursts and other planetary and heliospheric sources. These theories are analytically unified here, the SGT and EBT regimes are elucidated, and new regimes are uncovered. It is predicted that all the subregimes have lognormal wave-intensity statistics. This is verified using published data on type III solar radio bursts, magnetospheric waves, pulsar radio emissions, and simulations, leading to data collapse onto a single theoretical curve with no free parameters. Simplified model equations for the dynamics of generalized SGT are proposed and their results are compared with quasilinear and PIC simulations, and with theory. These are the first simulations to show direct evidence of SGT. Evidence for divergence of correlation lengths as a critical point is approached is also presented, possibly pointing to existence of a self-organized critical regime.
Cairns Iver H.
Li Baowen
Robinson Adam P.
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