Computer Science
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ep%26s...51..129y&link_type=abstract
Earth, Planets and Space, Volume 51, p. 129-138.
Computer Science
15
Scientific paper
Diurnal variations of the parameters of the magnetospheric Alfvén resonator at different latitudes have been calculated using a semi-empirical model of the ionosphere-magneto-sphere plasma distribution. The ionospheric plasma density is taken from the IRI model, the electron density at the magnetospheric equator is based on the ISEE/whistler model, and the field-aligned magnetospheric plasma distribution is calculated under the assumption of diffusive equilibrium. It is shown that for the mid-latitude ionosphere the Hall conductivity has no effect on the parameters of the magnetospheric Alfvén resonator. The calculated values of damping rates of Alfvén oscillations at middle latitudes during the dark period are too high for the "free-end" and "quarter-wave" oscillation regimes to be realized. At low latitudes quality factors are relatively high both at daytime and nighttime conditions. An expected change of a field-aligned structure of Alfvén oscillations during the transition from dayside to nightside ionospheric conditions does not occur. The analysis of the experimental data recorded at middle and low latitude stations of the "210° Magnetic Meridian" magnetometer network and station l'Aquila gives the results, compatible with the predictions of the numerical model: (a) the pulsation amplitude in a frequency band near the fundamental harmonic of the Alfvén field line resonance has the strongest dependence on the ionospheric conductivity; (b) the influence of day/night ionospheric conditions on the Pc 3 amplitudes is less at low (L ≤ 2) geomagnetic latitudes than at middle latitudes; (c) the ionospheric conductivity control of the Pc 3 amplitude at middle latitudes weakens with increasing harmonic number.
Fedorov Evgeniy
Pilipenko Viacheslav
Vellante Massimo
Yagova N.
Yumoto Kiyo
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