Analysis of Intense Z-Mode Emission Observed During the Cassini Proximal Orbits

被引：9

作者：

Menietti, J. D. ^{[1
]}

Averkamp, T. F. ^{[1
]}

Ye, S. -Y. ^{[1
]}

Sulaiman, A. H. ^{[1
]}

Morooka, M. W. ^{[2
]}

Persoon, A. M. ^{[1
]}

Hospodarsky, G. B. ^{[1
]}

Kurth, W. S. ^{[1
]}

Gurnett, D. A. ^{[1
]}

Wahlund, J. -E. ^{[2
]}

机构：

[1] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

[2] Swedish Inst Space Phys, Uppsala, Sweden

来源：

GEOPHYSICAL RESEARCH LETTERS | 2018年 / 45卷 / 14期

关键词：

Z-mode emission; Saturn proximal orbits; wave source region; OUTER RADIATION BELT; RELATIVISTIC ELECTRONS; ACCELERATION; RADIO; LOSSES; SATURN;

D O I：

10.1002/2018GL077354

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The role of Z-mode emission in the diffusive scattering and resonant acceleration of electrons is believed to be important at Saturn. A survey of the 5kHz component of this emission at Saturn earlier reported strong intensity in the lower density regions where the ratio of plasma frequency to cyclotron frequency, f(p)/f(c)<1. At Saturn this occurs along the inner edge of the Enceladus torus near the equator and at higher latitudes. Using the Cassini Radio and Plasma Wave Science instrument observations during the Cassini proximal orbits, we have now identified these emissions extending down to and within the ionosphere. Wave polarization measurements and unique frequency cutoffs are used to positively identify the wave mode. Analogous to the role of whistler mode chorus at Earth, Saturn Z-mode emissions may interact with electrons contributing to the filling or depleting of Saturn's inner radiation belts.

引用

页码：6766 / 6772

页数：7

共 32 条

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