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SUNWARD-PROPAGATING ALFVÉNIC FLUCTUATIONS OBSERVED IN THE HELIOSPHERE
Hui Li; Chi Wang; John W. Belcher; Jiansen He; John D. Richardson
Department空间科学部
Source PublicationAstrophysical Journal Letters
2016
Volume824Issue:1
ISSN2041-8205
Language英语
AbstractThe mixture/interaction of anti-sunward-propagating Alfvénic fluctuations (AFs) and sunward-propagating Alfvénic fluctuations (SAFs) is believed to result in the decrease of the Alfvénicity of solar wind fluctuations with increasing heliocentric distance. However, SAFs are rarely observed at 1 au and solar wind AFs are found to be generally outward. Using the measurements from Voyager 2 and Wind, we perform a statistical survey of SAFs in the heliosphere inside 6 au. We first report two SAF events observed by Voyager 2. One is in the anti-sunward magnetic sector with a strong positive correlation between the fluctuations of magnetic field and solar wind velocity. The other one is in the sunward magnetic sector with a strong negative magnetic field—velocity correlation. Statistically, the percentage of SAFs increases gradually with heliocentric distance, from about 2.7% at 1.0 au to about 8.7% at 5.5 au. These results provide new clues for understanding the generation mechanism of SAFs.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5448
Collection空间科学部
Recommended Citation
GB/T 7714
Hui Li,Chi Wang,John W. Belcher,et al. SUNWARD-PROPAGATING ALFVÉNIC FLUCTUATIONS OBSERVED IN THE HELIOSPHERE[J]. Astrophysical Journal Letters,2016,824(1).
APA Hui Li,Chi Wang,John W. Belcher,Jiansen He,&John D. Richardson.(2016).SUNWARD-PROPAGATING ALFVÉNIC FLUCTUATIONS OBSERVED IN THE HELIOSPHERE.Astrophysical Journal Letters,824(1).
MLA Hui Li,et al."SUNWARD-PROPAGATING ALFVÉNIC FLUCTUATIONS OBSERVED IN THE HELIOSPHERE".Astrophysical Journal Letters 824.1(2016).
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