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Identification of the magnetic cloud boundary layers
Wei, F. S.; Liu, R.; Fan, Q. L.; Feng, X. S.; 北京8701信箱
Source PublicationJournal of Geophysical Research-Space Physics
KeywordMagnetic Clouds Magnetic Reconnection Boundary Layer Solar-wind October 18-19 January 1997 Reconnection Fields Events Storms Loop Prominences Simulation
AbstractBased on a statistical analysis of the boundary physical states of 80 magnetic clouds reported in the literature from the years 1969 to 2001, we suggest a new identification of the magnetic cloud boundary by describing it as front and tail boundary layers (BLs) formed through the interaction between the magnetic cloud and the ambient medium. In our identification the outer boundary of the layer often displays the properties of magnetic reconnection, which could be characterized by a "three-high state'' ( relatively high proton temperature, high proton density, and high plasma beta) and the corresponding magnetic signatures ( the intensity drop and the abrupt azimuthal changes, Deltaphi similar to 180degrees, and latitudinal changes, Deltatheta similar to 90degrees, in the magnetic field). The inner boundary of the layer exhibits a "three-low state'' ( relatively low proton temperature, low proton density, and low plasma beta) and separates the magnetic cloud body, which has not basically been affected by the interactions, from the boundary layers. The front boundary layer could be associated with the outer loops of CMEs and its average time scale is 1.7 hours; the tail boundary layer seems not be a filament and its average time scale is 3.1 hours. The distribution function of magnetic fluctuations in the boundary layer is significantly different from those in the ambient solar wind and the cloud body itself. The preliminary numerical simulation in principle confirms this new identification and could qualitatively explain most of the observations of the cloud boundary. This work could help partly overcome some inconsistencies in identifying the boundaries of magnetic clouds.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Wei, F. S.,Liu, R.,Fan, Q. L.,et al. Identification of the magnetic cloud boundary layers[J]. Journal of Geophysical Research-Space Physics,2003,108(A6):1263.
APA Wei, F. S.,Liu, R.,Fan, Q. L.,Feng, X. S.,&北京8701信箱.(2003).Identification of the magnetic cloud boundary layers.Journal of Geophysical Research-Space Physics,108(A6),1263.
MLA Wei, F. S.,et al."Identification of the magnetic cloud boundary layers".Journal of Geophysical Research-Space Physics 108.A6(2003):1263.
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