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Measurements of the Vorticity in the Bursty Bulk Flows
Zhang, L.Q.1; Baumjohann, W.2; Dai, L.1; Khotyaintsev, Yu V.3; Wang, C.1
Keywordvorticity flow eddy bursty bulk flows Curlometer analysis kinetic Alfvenic wave
AbstractCurlometer analysis from 4-point Magnetospheric Multiscale spacecraft measurements is applied to obtain the vorticity (omega) in the bursty bulk flow (BBF) from tail reconnection. Increases of the vorticity is associated with enhancements of the high-energy ion flux (above 10 keV) and the flow speed during the BBF. Finger-like structure, consisting of the lower-energy ions below 10 keV, occurs mainly during intervals of small vorticity. The vorticity during BBF consistently shows a dominant -Z Geocentric solar magnetospheric (GSM) component, indicating clockwise vortexes in the flows. Combined with bipolar signals of Vy-geocentric solar magnetic, the Magnetospheric Multiscale observations provide evidence for flow eddies in the BBF. Power spectral analysis suggests existence of kinetic Alfvenic wave emissions, in addition to the flow eddy, in the high-frequency regime in the BBF turbulence.
Indexed BySCI ; EI
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Document Type期刊论文
Affiliation1.State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing, China;
2.Space Research Institute, Austrian Academy of Sciences, Graz, Austria;
3.Swedish Institute of Space Physics, Uppsala, Sweden
Recommended Citation
GB/T 7714
Zhang, L.Q.,Baumjohann, W.,Dai, L.,et al. Measurements of the Vorticity in the Bursty Bulk Flows[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(17-18):10322-10329.
APA Zhang, L.Q.,Baumjohann, W.,Dai, L.,Khotyaintsev, Yu V.,&Wang, C..(2019).Measurements of the Vorticity in the Bursty Bulk Flows.GEOPHYSICAL RESEARCH LETTERS,46(17-18),10322-10329.
MLA Zhang, L.Q.,et al."Measurements of the Vorticity in the Bursty Bulk Flows".GEOPHYSICAL RESEARCH LETTERS 46.17-18(2019):10322-10329.
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