Influence of ionospheric conductivity on mid-latitude Pc 3-4 pulsations
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- Yagova N.
- Institute of the Physics of the Earth
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- Pilipenko V.
- Institute of the Physics of the Earth
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- Fedorov E.
- Institute of the Physics of the Earth
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- Vellante M.
- l'Aquila University
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- Yumoto K.
- Kyushu University
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Diurnal variations of the parameters of the magnetospheric Alfvén resonator at different latitudes have been calculated using a semi-empirical model of the ionosphere-magnetosphere 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.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 51 (2), 129-138, 1999
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
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詳細情報 詳細情報について
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- CRID
- 1390282681485747712
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- NII論文ID
- 10003737356
- 130003955981
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- NII書誌ID
- AA11211921
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- COI
- 1:CAS:528:DyaK1MXjsV2lt70%3D
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 4681767
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可