DOI: 10.1002/2015GL067370
论文题名: MESSENGER observations of induced magnetic fields in Mercury's core
作者: Johnson C.L. ; Philpott L.C. ; Anderson B.J. ; Korth H. ; Hauck S.A. ; II ; Heyner D. ; Phillips R.J. ; Winslow R.M. ; Solomon S.C.
刊名: Geophysical Research Letters
ISSN: 0094-9235
EISSN: 1944-8966
出版年: 2016
卷: 43, 期: 6 起始页码: 2436
结束页码: 2444
语种: 英语
英文关键词: core radius
; induced magnetic fields
; Mercury
; MESSENGER
Scopus关键词: Magnetic fields
; Magnetism
; Magnetopause
; Magnetosphere
; Orbits
; Tracking (position)
; Core radius
; Extreme events
; Induced magnetic fields
; Magnetospheric field
; MErcury Surface
; MESSENGER
; Planetary surfaces
; Space environment
; Mercury (metal)
; core (planetary)
; magnetic field
; magnetopause
; magnetosphere
; mantle convection
; Mercury (planet)
; planetary atmosphere
; planetary surface
; spacecraft
; upper mantle
英文摘要: Orbital data from the Magnetometer on the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft allow investigation of magnetic fields induced at the top of Mercury's core by time-varying magnetospheric fields. We used 15 Mercury years of observations of the magnetopause position as well as the magnetic field inside the magnetosphere to establish the presence and magnitude of an annual induction signal. Our results indicate an annual change in the internal axial dipole term, g10, of 7.5 to 9.5 nT. For negligible mantle conductivity, the average annual induction signal provides an estimate of Mercury's core radius to within ±90 km, independent of geodetic results. Larger induction signals during extreme events are expected but are challenging to identify because of reconnection-driven erosion. Our results indicate that the magnetopause reaches the dayside planetary surface 1.5-4% of the time. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84977938138&doi=10.1002%2f2015GL067370&partnerID=40&md5=dc8a370cc9e18eceaf8370bdf57c2df8
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10198
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada
Recommended Citation:
Johnson C.L.,Philpott L.C.,Anderson B.J.,et al. MESSENGER observations of induced magnetic fields in Mercury's core[J]. Geophysical Research Letters,2016-01-01,43(6).