Astrophysically Relevant Turbulent Magnetic Fields in Table-Top Intense-Laser Experiments

We present experiments on the spatio-temporal dynamics of megagauss magnetic fields created in solid-density plasmas by intense femtosecond laser pulses. Our results display distinctive signatures of the Kolmogorov -5/3 scaling in the k-spectra of the turbulent magnetic fields. About 50 picoseconds after the incidence of the main interaction laser pulse, the spectrum displays two distinct turbulent regimes, characterized by a -5/3 scaling (for smaller values of k) and a -7/3 scaling (for larger values of k), separated by a spectral ``kink.'' Similar spectral ``knees'' have been observed previously in Alfven ion cyclotron waves in the turbulent magnetosheath of the earth as well as in turbulent processes in the solar photosphere.