Statistics – Applications
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh53a1485l&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH53A-1485
Statistics
Applications
2134 Interplanetary Magnetic Fields, 2149 Mhd Waves And Turbulence (2752, 6050, 7836), 2164 Solar Wind Plasma, 3280 Wavelet Transform (3255, 4455)
Scientific paper
Wavelet transform is a time-frequency representation with a wide range of applications in physics. It can extract the fluctuation component of different scales from the turbulent background. Here, we use it to study the coherence and the polarity distribution of magnetic fluctuation in different scales in solar wind. We examine the simultaneous ACE and WIND measurement, and find the magnetic fluctuation in different scale has a similar coherence pattern but a different size, which is naturally proportional to the scale. We also study the direction of local fluctuation obtained by wavelet transform, which is very helpful to the understanding of geometry and random property of the interplanetary magnetic field. Our preliminary results show the dependence of the polarity preference on the scales. While the polarity of the fluctuation has a perpendicular trend to both radial and mean field direction, this trend increases for radial but decreases for mean field in the relative larger scales (~100 minutes in Mexican Hat wavelet). This may imply the depletion of the Alfvenity in the larger scale fluctuations. We check the Ulysses magnetometer data in the fast wind (>750 km/s) during solar minimum from 1993 through 1996, but find no obvious solar range variation of this polarity tendency. However, the lack of data in the relative larger scales could affect the accuracy of the statistics. Future work will focus on the effect of solar wind speed.
Giacalone Joe
Luo Qiang
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