Non-Gaussian probability distribution of short time scale magnetic field fluctuations at Terra Nova Bay (Antarctica).

The probability distribution functions (PDFs) of short time scale magnetic field fluctuations have been evaluated for Terra Nova Bay data for the time period December 1993 - January 1994. It is found that short time field fluctuations are not Gaussian distributed during disturbed periods. Moreover, magnetic field fluctuations PDFs are quite similar to solar wind parameters statistical distributions near the polar cusp region. Otherwise, in the polar cap the PDF seems to be compatible with a "Truncated Levy Flight" process. The relevance of these observations for the understanding of magnetospheric plasma transport processes is pointed out.