GSTDTAP  > 气候变化
DOI10.1029/2018GL078137
Saturn's Plasma Density Depletions Along Magnetic Field Lines Connected to the Main Rings
Farrell, W. M.1; Hadid, L. Z.2; Morooka, M. W.2; Kurth, W. S.3; Wahlund, J. -E.2; MacDowall, R. J.1; Sulaiman, A. H.3; Persoon, A. M.3; Gurnett, D. A.3
2018-08-28
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
EISSN1944-8007
出版年2018
卷号45期号:16页码:8104-8110
文章类型Article
语种英语
国家USA; Sweden
英文摘要

We report on a set of clear and abrupt decreases in the high-frequency boundary of whistler mode emissions detected by Cassini at high latitudes (about +/- 40 degrees) during the low-altitude proximal flybys of Saturn. These abrupt decreases or dropouts have start and stop locations that correspond to L shells at the edges of the A and B rings. Langmuir probe measurements can confirm, in some cases, that the abrupt decrease in the high-frequency whistler mode boundary is associated with a corresponding abrupt electron density dropout over evacuated field lines connected to the A and B rings. Wideband data also reveal electron plasma oscillations and whistler mode cutoffs consistent with a low-density plasma in the region. The observation of the electron density dropout along ring-connecting field lines suggests that strong ambipolar forces are operating, drawing cold ionospheric ions outward to fill the flux tubes. There is an analog with the refilling of flux tubes in the terrestrial plasmasphere. We suggest that the ring-connected electron density dropouts observed between 1.1 and 1.3 R-s are connected to the low-density ring plasma cavity observed overtop the A and B rings during the 2004 Saturn orbital insertion pass.


Plain Language Summary We present Cassini observations during the close passes by the planet Saturn indicating that plasma on magnetic field lines that pass through the A and B rings is of anomalously low density. These observations are consistent with the Saturn orbit insertion observations of a plasma cavity located at equatorial regions overtop the dense B ring. Using a terrestrial analogy, we suggest that the low-density conditions overtop the rings create an electrical force, called an ambipolar electric field that draws plasma out of the ionosphere in an attempt to replenish the plasma void found at equatorial regions.


英文关键词Saturn Cassini rings plasma
领域气候变化
收录类别SCI-E
WOS记录号WOS:000445612500026
WOS关键词MAGNETOSPHERE ; IONOSPHERE ; ENVIRONMENT ; ENCELADUS ; RADIO ; ORBIT
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/26031
专题气候变化
作者单位1.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA;
2.Swedish Inst Space Phys, Uppsala, Sweden;
3.Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
推荐引用方式
GB/T 7714
Farrell, W. M.,Hadid, L. Z.,Morooka, M. W.,et al. Saturn's Plasma Density Depletions Along Magnetic Field Lines Connected to the Main Rings[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(16):8104-8110.
APA Farrell, W. M..,Hadid, L. Z..,Morooka, M. W..,Kurth, W. S..,Wahlund, J. -E..,...&Gurnett, D. A..(2018).Saturn's Plasma Density Depletions Along Magnetic Field Lines Connected to the Main Rings.GEOPHYSICAL RESEARCH LETTERS,45(16),8104-8110.
MLA Farrell, W. M.,et al."Saturn's Plasma Density Depletions Along Magnetic Field Lines Connected to the Main Rings".GEOPHYSICAL RESEARCH LETTERS 45.16(2018):8104-8110.
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