The acoustic spectra in sunspots are known to be richer in higher frequency power. We have attempted a generalized study of the effect of magnetic fields on the shape of the acoustic spectrum using GONG+ bread-board data (spatial scale of ∼ 2 arc-sec per pixel) of 11 May, 2000 and 12 June, 2000. The mean power spectra of the velocity oscillations were obtained by averaging over several spectra ...

We study the principal aspects of the interaction between acoustic phonons and two-dimensional electrons in quantizing magnetic fields corresponding to even denominator fractions. Using the composite fermion approach we derive the vertex of the electron-phonon coupling mediated by the Chern-Simons gauge field. We estimate acoustic phonon contribution to electronic mobility, phonon-drag thermopo...

Previous investigations (Kinsloe et al., 1954) of the effect of time, pH, temperature and acoustic field on the destruction of microorganisms by vibratory energy showed the destruction to be due largely to mechanical breakdown and that the rate of destruction was dependent on the acoustic field. The objectives of the present study include a comparisoii of the effect on microorganisms of a focus...