在轨单粒子翻转与太阳活动变化的相关性研究

单粒子翻转(SEU)是空间仪器受辐射环境影响而产生的最常见的故障之一,而太阳活动是影响空间仪器所在的空间辐射环境的重要因素,为了分析太阳活动对空间仪器单粒子翻转的影响,总结了第24太阳活动周期中,2010年3月～2015年4月,来自3个不同低轨道面上的48个在轨仪器的单粒子翻转情况与太阳活动变化的关系.通过统计分析单粒子翻转数量随时间的变化规律以及对单粒子翻转与太阳黑子数量变化的相关性分析,发现单粒子翻转与太阳活动呈负相关,在太阳活跃期,单粒子翻转数变化曲线在延迟一段时间后与太阳黑子数变化曲线有较强的相关性.这一发现对空间仪器单粒子翻转的预测有重要参考价值,通过对太阳活动变化的观测评估预测特定时段内仪器在空间环境中的可靠性,从而通过设计应对的抗辐射加固方案来规避空间辐射风险.

Study on correlationship between solar activity and on orbit SEU rate

Single event upset (SEU) is one of the most common faults caused by the radiation environment of space instrument,and solar activity is an important factor affecting the space radiation environment of the space instrument.In order to analyze the effect of solar activity on the single event upset of space instrument in this paper,the relation between the solar activity changes of the 24th solar cycle and the on-orbit single event upset data are studied,which are collection from 48 instruments in three different low orbit satellites during March 2010 to April 2015.By combining the sunspot and SEU we found a negative relation between the solar activity with the SEU and the SEU curve after a specified delay had a strong correlation with the sunspot curve during the activity period,the lower the orbit,the better the correlation.This finding provides an important reference value for the prediction of the single event upset of space instrument.The reliability of the instrument in the space environment can be predicted and evaluated by observing the change of the solar activity for a specific period of time,so as to avoid the space radiation risk by designing the antiradiation reinforcement scheme.