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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Magnetopause crossings observed at 6.6 R_E
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Magnetopause crossings observed at 6.6 R_E

机译：在6.6 R_E处观察到磁更年期交叉

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摘要

Thirty-five boundary crossing events, many with multiple crossings, have been observed in data from the GOES 6 and 7 geostationary satellites in the years 1989, 1990 and 1991. Many of the crossings within these events appear to have been caused primarily by inward boundary motion due to compression of the magnetosphere by the solar wind and some were crossings caused primarily by inward motion due to geomagnetic field erosion. Most crossings appear to be due to some combination of compression and erosion. A rise of the main, northward component of the Earth's magnetic field to approximately twice the dipole level, observed prior to a crossing, is taken as evidence of inward motion due to compression. When a crossing occurs with no prior rise of the northward component, it is taken as evidence of erosion. The magnetosheath field, just outside the boundary, is found to be predominantly southward for almost all of the crossings, including those due to compression as well as those due to erosion. This indicates that, even for the many events noted above for which inward motion by compression appears adequate to account for the boundary crossings, there is almost always some erosion present. In the 3-year interval, each spacecraft spent 0.3 % of the dayside observation time in the magnetosheath.
机译：在1989年，1990年和1991年的GOES 6和7号对地静止卫星数据中观测到了35个边界交叉事件，其中许多具有多次交叉。这些事件中的许多交叉似乎主要是由向内边界引起的。由于太阳风对磁层的压缩而产生的运动，有些是穿越，主要是由于地磁场侵蚀引起的向内运动引起的。大多数穿越似乎是由于压缩和侵蚀的某种结合。在穿越之前观察到，地球磁场的主要北向分量上升到偶极子水平的大约两倍，被视为由于压缩而向内运动的证据。当发生交叉而没有北向分量事先上升时，则将其视为侵蚀的证据。几乎在所有边界处，包括边界处的磁石场都被发现主要向南，包括由于压缩和侵蚀引起的。这表明，即使对于上面提到的许多事件，通过压缩的向内运动似乎足以说明边界交叉，也几乎总是存在一些侵蚀。在3年的时间间隔内，每个航天器在磁石荒场上花费的白天观测时间为0.3％。

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