DOI: 10.1002/grl.50505
论文题名: Field-aligned current reconfiguration and magnetospheric response to an impulse in the interplanetary magnetic field BY component
作者: Wilder F.D. ; Eriksson S. ; Korth H. ; Baker J.B.H. ; Hairston M.R. ; Heinselman C. ; Anderson B.J.
刊名: Geophysical Research Letters
ISSN: 0094-8940
EISSN: 1944-8671
出版年: 2013
卷: 40, 期: 11 起始页码: 2489
结束页码: 2494
语种: 英语
英文关键词: AMPERE
; convection
; field aligned currents
; ionosphere
; MI coupling
; polar cap
Scopus关键词: AMPERE
; Defense Meteorological Satellite Programs
; Field aligned currents
; Incoherent scatter radar
; Interplanetary magnetic fields
; Planetary electrodynamics
; Polar cap
; Solar wind dynamic pressure
; Geomagnetism
; Heat convection
; Ionosphere
; Magnetic fields
; Magnetosphere
; Solar wind
; Ionospheric measurement
; geomagnetic field
; ionosphere
; magnetopause
; magnetosphere
; spacecraft
; thermosphere
; timescale
英文摘要: When the interplanetary magnetic field (IMF) is dawnward or duskward, magnetic merging between the IMF and the geomagnetic field occurs near the cusp on the dayside flanks of the magnetosphere. During these intervals, flow channels in the ionosphere with velocities in excess of 2 km/s have been observed, which can deposit large amounts of energy into the high-latitude thermosphere. In this study, we analyze an interval on 5 April 2010 where there was a strong dawnward impulse in the IMF, followed by a gradual decay in IMF magnitude at constant clock angle. Data from the Sondrestrom incoherent scatter radar and the Defense Meteorological Satellite Program spacecraft were used to investigate ionospheric convection during this interval, and data from the Active Magnetospheric and Planetary Electrodynamics Response Experiment (AMPERE) were used to investigate the associated Field-Aligned Current (FAC) system. Additionally, data from AMPERE were used to investigate the time response of the dawnside FAC pair. We find there is a delay of approximately 1.25 h between the arrival of the dawnward IMF impulse at the magnetopause and strength of the dawnward FAC pair, which is comparable to substorm growth and expansion time scales under southward IMF. Additionally, we find at the time of the peak FAC, there is evidence of a reconfiguring four-sheet FAC system in the morning local time sector of the ionosphere. Additionally, we find an inverse correlation between the dawn FAC strength and both the solar wind Alfvénic Mach number and the SYM-H index. No statistically significant correlation between the FAC strength and the solar wind dynamic pressure was found. © 2013 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879962277&doi=10.1002%2fgrl.50505&partnerID=40&md5=2f229744a806a6f07d5163e7c0176c28
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6204
Appears in Collections: 气候减缓与适应
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作者单位: Laboratory of Atmospheric and Space Physics, University of Colorado at Boulder, Boulder, CO, United States
Recommended Citation:
Wilder F.D.,Eriksson S.,Korth H.,et al. Field-aligned current reconfiguration and magnetospheric response to an impulse in the interplanetary magnetic field BY component[J]. Geophysical Research Letters,2013-01-01,40(11).