Space electromagnetic signal will occurre around the collision region, when the e(superscript +)/e(superscript -) beams in the BEPC passes through the BES.

• 摘要当北京正负电子对撞机(BEPC)提供的e(上标+)/e(上标-)束流通过北京谱仪(BES)时，在对撞区附近会产生一个空间电磁信号。