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Statistical Study of the Relationship Between Ion Upflow and Field‐Aligned Current in the Topside Ionosphere for Both Hemispheres During Geomagnetic Disturbed and Quiet Time
Author(s) -
Ma YuZhang,
Zhang QingHe,
Jayachandran P. T.,
Oksavik Kjellmar,
Lyons L. R.,
Xing ZanYang,
Zhou ShanYu,
Hairston Marc,
Wang Yong
Publication year - 2020
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1029/2019ja027538
Subject(s) - noon , quiet , ionosphere , earth's magnetic field , atmospheric sciences , dusk , local time , midnight , physics , disturbance (geology) , daytime , geophysics , geodesy , geology , magnetic field , astronomy , statistics , mathematics , quantum mechanics , paleontology
A statistical study of ion upflow and field‐aligned currents (FACs) has been performed in the topside ionosphere of both hemispheres for magnetic quiet and disturbed times by using DMSP satellite observations from 2010–2013. Distributions in MLT/MLat reveal that ion upflow occurrence shows a dawn‐dusk asymmetry distribution that matches well with the Region 1 FACs. In addition, there are highest occurrence regions near noon and within the midnight auroral disturbance area, corresponding to dayside cusp and nightside auroral disturbance regions, respectively. Both the ion upflow occurrence and FAC regions expand equatorward to a wider area during disturbed times.