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Nighttime magnetic field fluctuations in the topside ionosphere at midlatitudes and their relation to medium-scale traveling ionospheric disturbances: The spatial structure and scale sizes

  • Previous studies suggested that electric and/or magnetic field fluctuations observed in the nighttime topside ionosphere at midlatitudes generally originate from quiet time nocturnal medium-scale traveling ionospheric disturbances (MSTIDs). However, decisive evidences for the connection between the two have been missing. In this study we make use of the multispacecraft observations of midlatitude magnetic fluctuations (MMFs) in the nighttime topside ionosphere by the Swarm constellation. The analysis results show that the area hosting MMFs is elongated in the NW-SE (NE-SW) direction in the Northern (Southern) Hemisphere. The elongation direction and the magnetic field polarization support that the area hosting MMFs is nearly field aligned. All these properties of MMFs suggest that they have close relationship with MSTIDs. Expectation values of root-mean-square field-aligned currents associated with MMFs are up to about 4nA/m(2). MMF coherency significantly drops for longitudinal distances of 1 degrees.

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Author:Jaeheung Park, Hermann Lühr, Guram Kervalishvili, Jan Rauberg, Ingo Michaelis, Claudia StolleORCiDGND, Young-Sil Kwak
ISSN:2169-9380 (print)
ISSN:2169-9402 (online)
Parent Title (English):Journal of geophysical research : Space physics
Publisher:American Geophysical Union
Place of publication:Washington
Document Type:Article
Year of first Publication:2015
Year of Completion:2015
Release Date:2017/03/27
Tag:Swarm constellation; midlatitude nighttime magnetic fluctuation; nighttime MSTID
First Page:6818
Last Page:6830
Funder:"Planetary system research for space exploration" project; KASI; Air Force Research Laboratory [FA2386-14-1-4004]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Erd- und Umweltwissenschaften
Peer Review:Referiert