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Statistical Study of Oxygen Ions Abundance and Spatial Distribution in the Dayside Magnetopause Boundary Layer: MMS Observations
Alternative TitleWOS:000556880400055
Zeng, Chen1; Wang, Chi1; Duan, Suping; Dai, Lei; Fuselier, S. A.; Burch, J. L.; Torbert, R. B.; Giles, B. L.
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2020
Volume125Issue:7Pages:e2019JA027323
DOI10.1029/2019JA027323
ISSN2169-9380
Language英语
Keyworddayside magnetopause boundary layer oxygen abundance and spatial distribution MASS-SPECTROMETER OBSERVATIONS INTERPLANETARY MAGNETIC-FIELD ALTITUDE POLAR-CAP PLASMA SHEET ENERGETIC OXYGEN HEAVY-IONS O+ IONS OUTFLOW DEPENDENCE WIND
AbstractUsing energetic ion composition data at the dayside magnetopause measured by Magnetospheric Multiscale (MMS) satellites, we study the responses of H+, O+ density (1-40 keV), and their ratio to geomagnetic activity and solar wind conditions; their spatial distributions in the XYGSM plane for different ranges of the above parameters are presented as well. The dependencies of the H+ and O+ fluxes spatial distributions on different energy ranges are also investigated. Statistical results show that the dependencies of the H+ density on SYM-H index, IMF By, and IMF Bz are weak, while the O+ density and its abundance (O+/H+) vary with SYM-H index and solar wind dynamic pressure exponentially. The IMF directions not only affect the O+ density and its abundance but also play a major role in their spatial distributions. The O+ density shows duskside asymmetry under southward IMF with positive IMF By and shows dawnside asymmetry under northward IMF with negative IMF By. The influence of the dawn-dusk IMF direction on dawn-dusk asymmetry is significant. The positive and negative IMF By can strengthen the O+ duskside asymmetry and dawnside asymmetry when the IMF is southward and northward, respectively. Otherwise, as particle energy enhances from similar to 10 to similar to 35 keV, the H+ fluxes concentrate more on the duskside magnetopause boundary layer while the O+ fluxes dawn-dusk asymmetry shows minor difference. This suggests that the H+ and O+ at energies below 40 keV experience different processes when they are transported to the dayside magnetopause boundary layer.
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7628
Collection中国科学院国家空间科学中心
Affiliation1.Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Fuselier, S. A.; Burch, J. L.] Southwest Res Inst, San Antonio, TX USA
4.Fuselier, S. A.] Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX USA
5.Torbert, R. B.] Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA
6.Giles, B. L.] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA
Recommended Citation
GB/T 7714
Zeng, Chen,Wang, Chi,Duan, Suping,et al. Statistical Study of Oxygen Ions Abundance and Spatial Distribution in the Dayside Magnetopause Boundary Layer: MMS Observations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2020,125(7):e2019JA027323.
APA Zeng, Chen.,Wang, Chi.,Duan, Suping.,Dai, Lei.,Fuselier, S. A..,...&Giles, B. L..(2020).Statistical Study of Oxygen Ions Abundance and Spatial Distribution in the Dayside Magnetopause Boundary Layer: MMS Observations.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,125(7),e2019JA027323.
MLA Zeng, Chen,et al."Statistical Study of Oxygen Ions Abundance and Spatial Distribution in the Dayside Magnetopause Boundary Layer: MMS Observations".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 125.7(2020):e2019JA027323.
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