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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.
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]
Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Simultaneously Formed Wedge‐Like Structures of Different Ion Species Deep in the Inner Magnetosphere.
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  Data: <searchLink fieldCode="AR" term="%22Ren%2C+Jie%22">Ren, Jie</searchLink><relatesTo>1</relatesTo><i> renjie_space@pku.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zong%2C+Q%2E+G%2E%22">Zong, Q. G.</searchLink><relatesTo>1</relatesTo><i> qgzong@pku.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Yue%2C+C%2E%22">Yue, C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhou%2C+X%2E+Z%2E%22">Zhou, X. Z.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Fu%2C+S%2E+Y%2E%22">Fu, S. Y.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Spence%2C+H%2E+E%2E%22">Spence, H. E.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Funsten%2C+H%2E+O%2E%22">Funsten, H. O.</searchLink><relatesTo>3</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Space+Physics%22">Journal of Geophysical Research. Space Physics</searchLink>. Dec2020, Vol. 125 Issue 12, p1-11. 11p.
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  Data: *<searchLink fieldCode="DE" term="%22Van+Allen+radiation+belts%22">Van Allen radiation belts</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetosphere%22">Magnetosphere</searchLink><br /><searchLink fieldCode="DE" term="%22Ion+analysis%22">Ion analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+wind%22">Solar wind</searchLink><br /><searchLink fieldCode="DE" term="%22Geomagnetic+indexes%22">Geomagnetic indexes</searchLink><br /><searchLink fieldCode="DE" term="%22Meteorological+satellites%22">Meteorological satellites</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetospheric+substorms%22">Magnetospheric substorms</searchLink>
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  Label: Abstract
  Group: Ab
  Data: 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]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1029/2020JA028192
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        Text: English
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      – SubjectFull: Van Allen radiation belts
        Type: general
      – SubjectFull: Magnetosphere
        Type: general
      – SubjectFull: Ion analysis
        Type: general
      – SubjectFull: Solar wind
        Type: general
      – SubjectFull: Geomagnetic indexes
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      – SubjectFull: Meteorological satellites
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      – SubjectFull: Magnetospheric substorms
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      – TitleFull: Simultaneously Formed Wedge‐Like Structures of Different Ion Species Deep in the Inner Magnetosphere.
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              Text: Dec2020
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