Propagating and Dynamic Properties of Magnetic Dips in the Dayside Magnetosheath: MMS Observations
Alternative TitleWOS:000545696000025
Yao, S. T.; Hamrin, M.; Shi, Q. Q.; Yao, Z. H.; Degeling, A. W.; Zong, Q. -G.; Liu, H.; Tian, A. M.; Liu, J.; Hu, H. Q.; Li, B.; Bai, S. C.; Russell, C. T.; Giles, B. L.
AbstractThe magnetosheath is inherently complex and rich, exhibiting various kinds of structures and perturbations. It is important to understand how these structures propagate and evolve and how they relate to the perturbations. Here we investigate a kind of magnetosheath structure known as a magnetic dip (MD). As far as we are aware, there have been no previous studies concerning the evolution (contracting or expanding) of these types of structures, and their propagation properties cannot be unambiguously determined. In this study, using Magnetospheric MultiScale (MMS) high-temporal resolution data and multispacecraft analysis methods, we obtain the propagation and dynamic features of a set of MDs. Four different types of MDs are identified: frozen-in, expanding, contracting, and stable-propagating. Significantly, a stable-propagation event is observed with a sunward propagation component. This indicates that the source of the structure in this case is closely associated with the magnetopause, which provides strong support to the contention in earlier research. We further reveal the mechanism leading to the MD contraction or expansion. The motion of the MDs boundary is found closely related with the dynamic pressure. The scale of the contracting and expanding events are typically similar to 5-20 rho(i) (ion gyroradius), significantly smaller than that of frozen-in events (similar to 40 rho(i)). The observations could relate large-scale (more than several tens of rho(i)) and kinetic-scale (less than rho(i)) MDs, by revealing an evolution that spans these different scales, and help us better understand the variation and dynamics of magnetosheath structures and plasmas.
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Affiliation1.[Yao, S. T.
2.Shi, Q. Q.
3.Degeling, A. W.
4.Tian, A. M.
5.Bai, S. C.] Shandong Univ, Inst Space Sci, Sch Space Sci & Phys, Shandong Key Lab Opt Astron & Solar Terr Environm, Weihai, Peoples R China
6.[Yao, S. T.
7.Liu, J.] Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China
8.[Yao, S. T.
9.Hamrin, M.] Umea Univ, Dept Phys, Umea, Sweden
10.[Yao, Z. H.] Univ Liege, STAR Inst, Lab Phys Atmospher & Planetaire, Liege, Belgium
11.[Zong, Q. -G.
12.Liu, H.] Peking Univ, Sch Earth & Space Sci, Beijing, Peoples R China
13.[Hu, H. Q.] Polar Res Inst China, SOA Key Lab Polar Sci, Shanghai, Peoples R China
14.[Li, B.] Wuhan Univ, Chinese Antarctic Ctr Surveying & Mapping, Wuhan, Peoples R China
15.[Russell, C. T.] Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA
16.[Giles, B. L.] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA
Recommended Citation
GB/T 7714
Yao, S. T.,Hamrin, M.,Shi, Q. Q.,et al. Propagating and Dynamic Properties of Magnetic Dips in the Dayside Magnetosheath: MMS Observations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2020,125(6):e2019JA026736.
APA Yao, S. T..,Hamrin, M..,Shi, Q. Q..,Yao, Z. H..,Degeling, A. W..,...&Giles, B. L..(2020).Propagating and Dynamic Properties of Magnetic Dips in the Dayside Magnetosheath: MMS Observations.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,125(6),e2019JA026736.
MLA Yao, S. T.,et al."Propagating and Dynamic Properties of Magnetic Dips in the Dayside Magnetosheath: MMS Observations".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 125.6(2020):e2019JA026736.
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