Persistence of the ring current, 1958-1984

Details Persistence of the ring current, 1958-1984 Persistence of the ring current, 1958-1984

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..891w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, Aug. 1989, p. 891-894.

Physics

10

Charged Particles, Magnetic Storms, Magnetosphere-Ionosphere Coupling, Radiative Lifetime, Ring Currents, Solar Cycles, Magnetic Disturbances, Particle Motion, Statistical Analysis

Scientific paper

Statistical evidence for a solar cycle modulation in storm-time ring current particle lifetimes is presented. Linear regression of Dst with respect to ap(tau), and an optimization of tau to maximize correlation, gives characteristic persistence times for each year through 2.5 solar cycles. These average persistences vary between less than 10 h at solar minimum (1962, 1975) to greater than 16 h at solar maximum (1970, 1981). The analysis is biased toward the later stages of recovery when the rate of decay has reduced, but the result is not a function of mean current strength or frequency of large storms. Increased abundance of O(+) is postulated as the most probable explanation of longer particle lifetimes at solar maximum, this strongly supports the proposition that a large fraction of the ring current is of ionospheric origin, and underlines the importance of dynamic coupling between the ionosphere and magnetosphere during disturbed periods.

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