Simultaneously Formed Wedge‐Like Structures of Different Ion Species Deep in the Inner Magnetosphere.
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| Title: | Simultaneously Formed Wedge‐Like Structures of Different Ion Species Deep in the Inner Magnetosphere. |
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| Authors: | Ren, Jie1 renjie_space@pku.edu.cn, Zong, Q. G.1 qgzong@pku.edu.cn, Yue, C.1, Zhou, X. Z.1, Fu, S. Y.1, Spence, H. E.2, Funsten, H. O.3 |
| Source: | Journal of Geophysical Research. Space Physics. Dec2020, Vol. 125 Issue 12, p1-11. 11p. |
| Subject Terms: | *Van Allen radiation belts, Magnetosphere, Ion analysis, Solar wind, Geomagnetic indexes, Meteorological satellites, Magnetospheric substorms |
| Abstract: | In this study, ion data from the Helium, Oxygen, Proton, and Electron (HOPE) spectrometers onboard Van Allen Probes reveal the existence of wedge‐like structures of O+, He+, and H+ ions deep in the inner magnetosphere. The behaviors of the wedge‐like structures in terms of temporal evolution, spatial distribution, upper energy limit, as well as dependence on solar wind and different geomagnetic indices are investigated from both event studies of several consecutive orbits on 3 February 2013 and the subsequent statistical analyses using 4 years of data. Unlike the dominant distribution at L=4–8 in the dayside observed by the polar orbit satellites in previous studies, the wedge‐like structures deep in the equatorial plane of the inner magnetosphere are found mostly at the Mcllwain L shells of L=2–5 and have a preferential location in the duskside and nightside. The O+ and He+ structures can extend to smaller L shells with higher upper energy limits than the H+ structures, while the upper energy limits of all these particle species show a similar variation tendency with respect to magnetic local time (MLT) and L. Observations indicate that these wedge‐like structures are probably attributed to fresh substorm injections from the outer region. Key Points: Van Allen Probe observations reveal the existence of wedge‐like ion structures mainly at the L shells of L=2–5Structures have a preferential location in the duskside and nightside, and the O+ and He+ structures have higher upper energy limits than H+The formation of these structures are probably attributed to substorm injections drifting earthward from the outer region [ABSTRACT FROM AUTHOR] |
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| Database: | GreenFILE |
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