6533b7dbfe1ef96bd127099e
RESEARCH PRODUCT
A coupled-map model for the magnetotail current sheet
Alexander J. KlimasDimitris VassiliadisJouni TakaloJuan Alejandro ValdiviaJussi Timonensubject
PhysicsDiffusion equationSpectral densityGeophysicsPower lawSpectral lineComputational physicsMagnetic fieldCurrent sheetSolar windGeophysicsPhysics::Space PhysicsGeneral Earth and Planetary SciencesMagnetohydrodynamicsdescription
A magnetic field model of the magnetotail current sheet in the form of a coupled-map lattice (CML) is presented. It is a continuously driven and based on the MHD diffusion equation. Solar wind vBs data (solar wind speed multiplied by the southward component of IMF) are used for driving the model, and it is shown to exhibit perturbations (avalanches) with power-law scalings in their distributions of duration and size. Such distributions may indicate self-organized critical (SOC) behavior. Furthermore, it is shown that the power spectra of the model outputs are of bicolor power-law form with different slopes for high and low frequencies. The model parameters determine the frequency of the break points of the spectra, and the slopes of their low and high frequency regimes.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-10-01 | Geophysical Research Letters |