The HXR peak delay of the 3B flare of March 6, 1989 (1354－1624UT) is about 130 seconds, while the rising time of the lowest energy channel of X-rays is only 150seconds. The authors use the trap plus precipitation model to explain this unprecedented and peculiar event. It is found that it can be well interpreted if two successive sources are involved and the coronal density is taken to be 109 cm-3%1989年3月6日1354-1624 uT的3B级大耀斑硬X射线的峰值延迟长达130秒，而硬X射线的最低能道上升至峰值的时间(上升沿)却只有150秒.在利用电子的捕获沉降模型来解释这一奇特事件，发现当日冕密度取109cm-3且存在双源作用时，捕获沉降模型可以解释观测结果.
展开▼
