Effects of magnetospheric activity on the current sheet energy resonance ion distribution function signature

Details Effects of magnetospheric activity on the current sheet energy resonance ion distribution function signature Effects of magnetospheric activity on the current sheet energy resonance ion distribution function signature

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11309222h&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue A9, CiteID A09222

Physics

Geophysics

2

Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Plasma Sheet, Nonlinear Geophysics: Chaos (7805), Radio Science: Nonlinear Phenomena (4400, 7839), Radio Science: Remote Sensing

Scientific paper

In this paper, we discuss the effects of magnetospheric activity (as measured by Kp) on an ion distribution function signature of nonlinear particle dynamics in current sheet-like magnetic fields. The signature manifests itself as a series of peaks in the ion distribution function whose separation depends on the fourth root of the energy and parameters that describe the current sheet structure. We have found that the signature is evident in Geotail CPI data for Kp <= 3+ and that the larger the value of Kp, the closer the peaks are together. We have also used the energy resonance signature in conjunction with measurements of the magnetic field to determine a lower bound on the current sheet thickness and have found that this lower bound decreases for increasing levels of magnetospheric activity. For values of Kp > 4-, there are frequently peaks in the ion distribution function; however, their separations do not follow a simple rule.

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