Day-night asymmetry of polar outflow due to the kinetic effects of anisotropic photoelectrons

Sunny W.Y. Tam, Fareed Yasseen, Tom Chang

研究成果: Chapter

1 引文 斯高帕斯(Scopus)

摘要

Recent polar wind measurements between 5000 and 9000 km altitude by the Akebono satellite indicate that both H+ and O+ ions can have remarkably higher outflow velocities in the sunlit region than on the nightside. In addition, electrons also display an asymmetric behavior: the dayside difference in energy spread, greater for upward-moving than downward-moving electrons, is absent on the nightside. We use a self-consistent hybrid model [Tam et ai, 1995b] that was developed for the polar wind outflow to address these observed day-night asymmetric features. The model takes into account the evolution of the polar wind self-consistently by properly recognizing the global, kinetic, collisional effects of the sunlit photoelectrons. By studying the effects of the presence and absence of photoelectrons on the polar outflow, we compare the daytime and night-time polar wind results, and demonstrate the asymmetries observed by the Akebono satellite.

原文English
主出版物標題Geospace Mass and Energy Flow
主出版物子標題Results From the International Solar-Terrestrial Physics Program, 1998
編輯James L. Horwitz, William K. Peterson, Dennis L. Gallagher
發行者Blackwell Publishing Ltd
頁面97-106
頁數10
ISBN(電子)9781118664162
ISBN(列印)9780875900872
DOIs
出版狀態Published - 1998

出版系列

名字Geophysical Monograph Series
104
ISSN(列印)0065-8448
ISSN(電子)2328-8779

All Science Journal Classification (ASJC) codes

  • 地球物理

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