Validation and Assessment of Dmsp Electron Temperatures in the Topside Ionosphere
Validation and Assessment of Dmsp Electron Temperatures in the Topside Ionosphere
复制标题
上部电离层 Dmsp 电子温度的验证和评估
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
B. Green
中科院分区：
文献类型：
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作者：
B. Green
摘要：近地空间环境中的地磁干扰会对许多军事和国防部（DoD）的系统和行动产生不利影响。为了提高对此类扰动的预测精度，下一代空间环境预报模型的目标是自动摄取实时电离层测量数据。本研究验证和评估了一种这样的测量-国防军事卫星计划（DMSP）测量的电子温度（T(sub e)）。DMSP T（下标e）的数据与1996年冬季至2000年夏季在密歇根州Millstone Hill和格陵兰岛Sondrestrom的近同步非相干散射雷达（ISR） T（下标e）的测量数据进行了验证。在37个Millstone和6个Sondrestrom连词中，DMSP T（下标e）的值平均超过ISR T（下标e）约25%，这几乎是ISR平均不确定性的三倍。DMSP与ISR T（下标e），百分比差异在太阳活动极大期最小，在太阳活动极小期增大，可能是由于光电子对DMSP T（下标e）测量的影响。在某些情况下，仪器相关的异常会产生不可靠的测量结果。基于假定的线性T（下标e），中纬度地区的行为，估计Millstone Hill以上的平均DMSP T（下标e）随机噪声水平约为4%，完全落在已公布的T（下标e）测量精度之内。需要对DMSP轨道的其他部分进行更全面的比较，以进一步验证DMSP T(sub e) - ISR T（sub e）偏移的根本原因。
Abstract : Geomagnetic disturbances in the near earth space environment can adversely affect numerous military and Department of Defense (DoD) systems and operations. To improve the prediction accuracy of such disturbances, the next generation of space environment forecast models aims to automatically ingest real-time ionospheric measurements. This research validates and assesses one such measurement - the Defense Military Satellite Program (DMSP) measured electron temperature (T(sub e)). DMSP T(sub e), data were validated against near simultaneous incoherent scatter radar (ISR) T(sub e), measurements from Millstone Hill, MA and Sondrestrom, Greenland between Winter 1996 and Summer 2000. Of the 37 Millstone and six Sondrestrom conjunctions compared, DMSP T(sub e), values exceeded ISR T(sub e), values by an average of about 25 percent, which is nearly three times the mean ISR uncertainty. DMSP vs. ISR T(sub e), percent differences were smallest during solar maximum, increasing towards solar minimum, likely due to photoelectron influence on DMSP T(sub e), measurements. In some cases, instrument related anomalies produced unreliable measurements. Based on an assumed linear T(sub e), behavior at mid latitudes, the average DMSP T(sub e) random noise level above Millstone Hill was estimated at about four percent, falling well within the published T(sub e) measurement accuracy. A more comprehensive comparison extending to other sectors of the DMSP orbit is required to further validate the root cause of the DMSP T(sub e), - ISR T(sub e) offset.