Cusp: a new acceleration region of the magnetosphere.

Details Cusp: a new acceleration region of the magnetosphere. Cusp: a new acceleration region of the magnetosphere.

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999czjph..49..667c&link_type=abstract

Czech. J. Phys., Vol. 49, No. 4a, p. 667 - 673

Physics

1

Earth Magnetosphere

Scientific paper

A new magnetospheric phenomenon called a cusp energetic particle (CEP) event has been discovered by the POLAR spacecraft in 1996. The events were detected in the dayside polar cusp near the apogee of POLAR and could last for hours, in which the measured helium ions had energies up to 8 MeV. All of these events were associated with a dramatic decrease in the magnitude of the local magnetic field. A fundamental question is where do the cusp MeV ions come from? To answer this question, the authors have compared the ion flux in the September 18, 1996 CEP events with that upstream from the bow shock and found that bow shock acceleration cannot explain the measured ion flux in the CEP events. The authors have further determined the parallel power spectra of the local magnetic field turbulence calculated over the CEP event periods for fluctuations in the ultra-low frequency (ULF) ranges, corresponding to periods of about 0.33-500 s. It is found that the mirror parameter, defined as the ratio of the square root of the integration of the parallel turbulent spectral component over the ULF ranges to the local mean field, is correlated with the intensity of the MeV helium flux. These new results represent a discovery that the high-altitude dayside cusp is a new acceleration region of the magnetosphere.

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