SSO及GEO典型太阳质子事件单粒子翻转率估算

文章根据NOAA卫星和GOES卫星的测量数据,对太阳质子事件期间地球同步轨道(GEO)和太阳同步轨道(SSO)的质子辐射情况进行考察.采用Bendel双参数模型对GEO和SSO由质子引起的器件单粒子翻转率进行估算,并分析了影响翻转率的因素.在器件敏感度一定的情况下,单粒子翻转率与大于能量阈值的质子总通量以及质子能谱硬度呈正相关.SSO与GEO的质子辐射及单粒子翻转预测对比研究结果表明:由太阳质子事件引起的SSO质子能谱比GEO的要“软”.太阳质子事件对SSO卫星的影响与对GEO卫星的影响之间存在相关性.两轨道上DRAM型的D424100V器件和SRAM型的HM6516器件的翻转率比值接近,SSO翻转率约为GEO的13％～22％,而双极型93L422器件翻转率比值则在26％～57％之间.通过对比SSO与GEO翻转率的比值和两轨道辐射程度的比值发现,不同的器件对能谱硬度的反应各异,原因是每种器件产生SEU的能量阈值不同.

Evaluation of proton-induced upset rate on SSO and GEO for typical solar particle events

The proton flux measurements during several significant solar proton events （SPEs） by the NOAA and GOES satellites are utilized to compare the proton radiation environments in SSO and GEO. Furthermore, the predictions of the proton-induced SEU in the SPEs are calculated by using the two-parameter Bendel model. Generally speaking, the proton-induced SEU has a positive correlation with the total proton flux and the spectrum hardness. The comparison between the proton radiations in SSO and GEO shows that the proton spectrum in SSO is ＇softer＇ than that in GEO. For the low-energy protons, the flux in SSO is greater than that in GEO, while the flux in SSO is less than that in GEO for the higher energy protons. The ratio of the upset rates of D424100V （DRAM） and HM6516 （SRAM） in SSO to that in GEO is about 13% to 22%; and the ratio of the upset rate of 93L422 （bipolar） in SSO to that in GEO is about 26% to 57%. By comparing the proton-induced upset rates with the proton radiation in SSO and GEO. it is discovered that each type of the electronic components is sensitive to the protons with different energies.