| DOI: | 10.1002/grl.50530
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| 论文题名: | Saturn's magnetospheric refresh rate |
| 作者: | Rymer A.M.; Mitchell D.G.; Hill T.W.; Kronberg E.A.; Krupp N.; Jackman C.M.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8956
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| EISSN: | 1944-8687
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| 出版年: | 2013
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| 卷: | 40, 期:11 | | 起始页码: | 2479
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| 结束页码: | 2483
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| 语种: | 英语
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| 英文关键词: | Jupiter
; magnetosphere
; period
; plasma
; Saturn
; substorm
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| Scopus关键词: | Equivalent scale
; Giant planets
; Jupiter's magnetosphere
; Jupiters
; period
; Saturn
; Saturn kilometric radiations
; Substorms
; Interplanetary flight
; Magnetosphere
; Photoionization
; Plasmas
; Loading
; Jupiter
; magnetosphere
; Northern Hemisphere
; planetary atmosphere
; plasma
; Saturn
; Southern Hemisphere
|
| 英文摘要: | A 2-3 day periodicity observed in Jupiter's magnetosphere (superposed on the giant planet's 9.5 h rotation rate) has been associated with a characteristic mass-loading/unloading period at Jupiter. We follow a method derived by Kronberg et al. () and find, consistent with their results, that this period is most likely to fall between 1.5 and 3.9 days. Assuming the same process operates at Saturn, we argue, based on equivalent scales at the two planets, that its period should be 4 to 6 times faster at Saturn and therefore display a period of 8 to 18 h. Applying the method of Kronberg et al. for the mass-loading source rates estimated by Smith et al. () based on data from the third and fifth Cassini-Enceladus encounters, we estimate that the expected magnetospheric refresh rate varies from 8 to 31 h, a range that includes Saturn's rotation rate of ∼10.8 h. The magnetospheric period we describe is proportional to the total mass-loading rate in the system. The period is, therefore, faster (1) for increased outgassing from Enceladus, (2) near Saturn solstice (when the highest proportion of the rings is illuminated), and (3) near solar maximum when ionization by solar photons maximizes. We do not claim to explain the few percent jitter in period derived from Saturn Kilometric Radiation with this model, nor do we address the observed difference in period observed in the north and south hemispheres. ©2013. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879985705&doi=10.1002%2fgrl.50530&partnerID=40&md5=ef59832d8a0ba10de35d6389fe3618ff
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/6220
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Johns Hopkins Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723, United States
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| Recommended Citation: | |
Rymer A.M.,Mitchell D.G.,Hill T.W.,et al. Saturn's magnetospheric refresh rate[J]. Geophysical Research Letters,2013-01-01,40(11).
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