射电天文研究组知识库

太阳射电爆发是无线通讯特别是卫星导航通讯的潜在影响因素之一。2015年11月4日的太阳射电爆发事件在1 415 MHz点频的流量达到了峰值5 800 SFU(Solar Flux Unit,太阳射电流量单位,1 SFU=10-22 W/（m2·Hz）),位于日下点的欧洲全球定位系统（Global Positioning System, GPS）和瑞典的航空导航系统均受到了影响。分析了此次事件产生源活动区的X射线流量变化与射电流量变化之间的时间关系;通过比对,X射线的流量抬升时间较射电阈值有30 min的提前量。随后讨论了提前量之间的物理背景,即软硬X射线分别对应热电子和非热电子辐射,而非热电子是产生能够造成此类空间天气事件射电爆发的物理条件,X射线由软转硬的过程中流量的抬升变化,为进一步防控这类空间天气事件提供了一种有效的手段。

Solar radio burst event ( SRB) is an optional factor for wireless communications especially satellites navigation communications. The peak flux of the SRB event in 4th November reached 5 800 SFU ( Solar Flux Unit) in 1 415 MHz. During this event, the GPS receivers in European and the Air navigation systems all suffered from stronge influences. In this paper, we analysed the relationship between X-ray flux variation and radio flux variation during this event. By comparing, the beginning time of X-ray flux upraising was 30 minutes earlier than radio flux. Furthermore, in this paper we discussed the background of phenomenon, the soft and hot X-rays correspond to hot and non-hot electron radiation, which is the physical condition that produces radio bursts that can cause such space weather events. The soft-to-hard process of X-rays can offer an effective early alarming method for this kind of space weather events.