DOI: 10.1002/grl.50749
论文题名: Sector structure of the interplanetary magnetic field in the nineteenth century
作者: Vokhmyanin M.V. ; Ponyavin D.I.
刊名: Geophysical Research Letters
ISSN: 0094-8760
EISSN: 1944-8491
出版年: 2013
卷: 40, 期: 14 起始页码: 3512
结束页码: 3516
语种: 英语
英文关键词: interplanetary magnetic field
; Svalgaard-Mansurov effect
Scopus关键词: Geomagnetic observation
; Geomagnetic variation
; Interplanetary magnetic fields
; Ionospheric disturbance
; Seasonal variation
; Solar magnetic fields
; Svalgaard-Mansurov effect
; Twentieth century
; Geomagnetism
; Magnetic fields
; interplanetary dust
; magnetic field
; nineteenth century
; solar wind
; Finland
; Helsinki
; Leningrad
; Russian Federation
; Saint Petersburg
; Varsinais-Suomi
英文摘要: The interplanetary magnetic field (IMF) is the magnetic field of the Sun stretched out by the solar wind. The polarity of the IMF is either positive or negative according to the polarity of the original solar magnetic field. The equivalent ionospheric Disturbance Polar current powered by the azimuthal Y component current system is located at polar latitudes and provides specific geomagnetic variations. It is known that the configuration of this system depends on the polarity of the IMF. Thus, in the absence of direct data in the presatellite era, the IMF sector structure could only be inferred from ground-based geomagnetic observations (Svalgaard,1968; Mansurov,1969). In this paper the IMF polarities have been reconstructed for the nineteenth century for the first time. It is possible due to the advent of the digitized geomagnetic records in the Helsinki and St. Petersburg observatories. These data have been available since 1844 and 1878, respectively. We assume that the reconstructions are reliable enough to study the solar magnetic field of the past. The polarities inferred for the nineteenth and twentieth centuries display similar sector structures. Seasonal variations of the ratio of positive and negative sectors give clear evidence of solar magnetic field reversals starting from the second half of the nineteenth century. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880910524&doi=10.1002%2fgrl.50749&partnerID=40&md5=a77730c1ff0b34985a05b2165ced05c0
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6024
Appears in Collections: 气候减缓与适应
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作者单位: Institute of Physics, St. Petersburg State University, 198504 St. Petersburg, Russian Federation
Recommended Citation:
Vokhmyanin M.V.,Ponyavin D.I.. Sector structure of the interplanetary magnetic field in the nineteenth century[J]. Geophysical Research Letters,2013-01-01,40(14).