title: Autocorrelation function and spectral linewidth of spiral chaos in a physical experiment.
abstract: We present results of physical experiments where we measure the autocorrelation function (ACF) and the spectral linewidth of the basic frequency of a spiral chaotic attractor in a generator with inertial nonlinearity both without and in the presence of external noise. It is shown that the ACF of spiral attractors decays according to an exponential law with a decrement which is defined by the phase diffusion coefficient. It is also established that the evolution of the instantaneous phase can be approximated by a Wiener random process.
authors.affiliation: Department of Physics, Institute of Nonlinear Dynamics, Saratov State University, 410012 Saratov, Russia.
authors.forename: Vadim S
authors.initials: VS
authors.lastname: Anishchenko
authors.forename: Tatjana E
authors.initials: TE
authors.lastname: Vadivasova
authors.forename: Jürgen
authors.initials: J
authors.lastname: Kurths
authors.forename: George A
authors.initials: GA
authors.lastname: Okrokvertskhov
authors.forename: Galina I
authors.initials: GI
authors.lastname: Strelkova