行星际高密度结构的磁场位形

本文统计分析了第20太阳周行星际高密度结构的磁场位形。结果说明当出现高密度结构时行星际磁场相对于黄道面的倾角约增大10°。这种增大并非流相互作用或电流片倾斜和折皱所引起的,而可能是非恒稳太阳风流所具有的磁场位形。当出现高速流或扇形边界时,由于高密度结构后平行于Parker螺旋线的分量增大,磁场在黄逋面内对螺旋线的偏离角减小。 

The Magnetic Field Configurations Associated With the Interplanetary High Density Structures

The magnetic field configurations associated with the interplanetary high density structures are analyzed statistically in this paper by the superposed epoch method.The results obtained show that an average increase of about 10 degrees is observed in the inclination angle of the interplanetary magnetic field vector from the ecliptic plane.Such an increase can neither be attributed to the interplanetary streams interaction nor the inclination and wrinkle of the current sheets.Instead,it is likely that the increase would be a kind of magnetic field configuration carried by the non-steady high-density solar-wind streams.Behind the high density structures,the deviations of magnetic field vectors in the ecliptic plane from the Parker's spiral line of force are related to the high speed streams or sector boundaries.The field components parallel to the spiral line of force increase behind the high density structures when associated with the high speed streams or the sector boundaries,and,as a result,the field vectors in the ecliptic plane lie closer to the spiral line of force.