Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsh23a..03t&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SH23A-03
Physics
7522 Helioseismology, 7833 Mathematical And Numerical Techniques (0500, 3200), 7857 Stochastic Phenomena (3235, 3265, 4475), 7863 Turbulence (4490)
Scientific paper
Inferences on turbulence in interplanetary plasmas commonly depend on the slope of the power spectrum. We have studied the slopes of spectra of the interplanetary magnetic field and charged particles from the HISCALE and EPAM detectors on Ulysses and ACE and find that it is systematically nonstationary. As an example, when the spectra are estimated on time blocks varying between three hours and one day, the average slope on the ACE GSE By component is close to -5/3, but fluctuations about this average are not random. Using 1-minute data, the slopes made from three hour data blocks offset by one hour gives a new time series. Power spectra of these series have strong peaks that are probably gravity modes. Here we extend these calculations to vector--valued data. The eigenvalues of the spectral matrices have similar characteristics to the individual components but the eigenvectors, that describe relative delay and orientation, point to several distinct families of modes.
Lanzerotti Louis J.
Thomson David J.
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