Solar cycle variations of magnetopause locations

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题名:	Solar cycle variations of magnetopause locations
作者:	許志浤;Němeček, Z.;Šafránková, J.;Lopez, R.E.;Dušík, Š.;Nouzák, L.;Přech, L.;Šimůnek, J.;Shue, J.-H.
贡献者:	地球科學學院太空科學與工程學系
关键词:	[formula omitted] flux;Compressing;Dynamic pressure;Interplanetary magnetic fields;Magnetic fields;Magnetopause;Magnetopause location;Mathematical models;Solar cycle;Solar cycles;Solar wind;Solar wind velocity
日期:	2016-07-15
上传时间:	2026-04-23 11:06:03 (UTC+8)
出版者:	Elsevier Ltd.;Elsevier Ltd
摘要:	摘要： The magnetopause location is generally believed to be determined by the solar wind dynamic pressure and by the sign and value of the interplanetary magnetic field vertical (BZ) component. The contribution of other parameters is usually considered to be minor or negligible near the equatorial plane. Recent papers have shown a magnetopause expansion during intervals of a nearly radial IMF but our ability to predict the magnetopause location under steady or slowly changing upstream conditions remains rather weak even if the effect of radial magnetic field is considered. We present a statistical study based on more than 10,000 magnetopause crossings identified in the THEMIS data in the course of the last half of the solar cycle. The observed magnetopause locations are compared with an empirical magnetopause model of Shue et al. (1997) and the sources of differences between observations and model predictions are analyzed. This analysis reveals that the magnetopause location depends on the solar activity being more compressed during the solar maximum. Furthermore, we have found that, beside the solar wind dynamic pressure and vertical magnetic field component, the solar wind speed and ionospheric conductivity (F10.7 used as a proxy) are important physical quantities controlling this compression. 出版者： Elsevier Ltd 出版日期： 2016-07-15 出處： Advances in space research, 2016-07, Vol.58 (2), p.240-248 資源來源： ScienceDirect (Elsevier) Journals 版權： 2016 識別號： ISSN: 0273-1177 識別號： EISSN: 1879-1948 識別號： DOI: 10.1016/j.asr.2015.10.012
显示于类别:	[太空科學與工程學系] 期刊論文

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