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Auroral ionospheric E region parameters obtained from satellite- based far-ultraviolet and ground-based ionosonde observations – effects of proton precipitation
Annales Geophysicae ( IF 1.9 ) Pub Date : 2021-01-28 , DOI: 10.5194/angeo-39-105-2021 Harold K. Knight
Annales Geophysicae ( IF 1.9 ) Pub Date : 2021-01-28 , DOI: 10.5194/angeo-39-105-2021 Harold K. Knight
Coincident auroral far-ultraviolet (FUV) and ground-based ionosonde observations are compared for the purpose of determining whether auroral FUV remote sensing algorithms that assume pure electron precipitation are biased in the presence of proton precipitation. Auroral particle transport and optical emission models, such as the Boltzmann 3-Constituent (B3C) model, predict that maximum E region electron density (NmE) values derived from auroral Lyman–Birge–Hopfield (LBH) emissions, assuming electron precipitation, will be biased by up to ∼20 % (high) for pure proton aurora, while comparisons between LBH radiances and radiances derived from in situ particle flux observations (i.e., Knight et al., 2008, 2012) indicate that the bias associated with proton aurora should be much larger. Surprisingly, in the comparisons with ionosonde observations described here, no bias associated with proton aurora is found in FUV-derived auroral NmE, which means that auroral FUV remote sensing methods for NmE are more accurate in the presence of proton precipitation than was suggested in the aforementioned earlier works. Possible explanations for the discrepancy with the earlier results are discussed.
中文翻译:
从基于卫星的远紫外线和基于地面的电离探空仪观测获得的极光电离层E区域参数–质子沉淀的影响
比较了巧合的极光远紫外线(FUV)和地面离子探空仪的观测结果,目的是确定质子沉淀的存在是否假设纯电子沉淀的极光FUV遥感算法有偏见。极光粒子传输和光发射模型(例如Boltzmann 3成分(B3C)模型)预测,假设电子沉淀,从极光Lyman–Birge–Hopfield(LBH)发射得出的最大E区电子密度(NmE)值将为偏差约20 纯质子极光的百分比(高),而LBH辐射与原位粒子通量观测值得出的辐射之间的比较(即Knight等人,2008、2012)表明,与质子极光相关的偏差应该更大。令人惊讶的是,在与此处所述的离子探空仪观测结果进行比较时,在FUV衍生的极光NmE中未发现与质子极光相关的偏差,这意味着存在质子沉淀时,极光FUV NmE遥感方法比在质子沉淀中建议的更准确。前面提到的作品。讨论了与早期结果不一致的可能解释。
更新日期:2021-01-28
中文翻译:
从基于卫星的远紫外线和基于地面的电离探空仪观测获得的极光电离层E区域参数–质子沉淀的影响
比较了巧合的极光远紫外线(FUV)和地面离子探空仪的观测结果,目的是确定质子沉淀的存在是否假设纯电子沉淀的极光FUV遥感算法有偏见。极光粒子传输和光发射模型(例如Boltzmann 3成分(B3C)模型)预测,假设电子沉淀,从极光Lyman–Birge–Hopfield(LBH)发射得出的最大E区电子密度(NmE)值将为偏差约20 纯质子极光的百分比(高),而LBH辐射与原位粒子通量观测值得出的辐射之间的比较(即Knight等人,2008、2012)表明,与质子极光相关的偏差应该更大。令人惊讶的是,在与此处所述的离子探空仪观测结果进行比较时,在FUV衍生的极光NmE中未发现与质子极光相关的偏差,这意味着存在质子沉淀时,极光FUV NmE遥感方法比在质子沉淀中建议的更准确。前面提到的作品。讨论了与早期结果不一致的可能解释。