Comparison of CHAMP and Digisonde plasma frequencies at Jicamarca, Peru
Comparison of CHAMP and Digisonde plasma frequencies at Jicamarca, Peru
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DOI：
10.1029/2006rs003491
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发表时间：
2007-04
期刊：
影响因子：
1.6
通讯作者：
L. McNamara;D. Cooke;C. Valladares;B. Reinisch
中科院分区：
文献类型：
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作者：
L. McNamara;D. Cooke;C. Valladares;B. Reinisch
从秘鲁Jicamara地区的电离层探空仪真高剖面推算出CHAMP卫星高度的电离层等离子体频率，并与CHAMP卫星的现场测量结果进行了比较。等离子体频率之间的差异已被发现在与电离层探空仪剖面相关的不确定度内，证实了CHAMP测量的有效性。对于小于250公里的卫星-电离层分离和低于F2层峰值的卫星高度，两个等离子体频率之间的平均差异为0.25 MHz或4%。对于最可靠的电离层探空仪测量，平均误差减少到0.18 MHz(或1.7%)，标准偏差为0.16 MHz(或1.5%)。考虑到CHAMP等离子体频率的有效性，相应的电离仪和CHAMP观测已经被用来支持通过假设具有等于F2层峰下侧的恒定标度高度的查普曼层来将电离层轮廓扩展到hmF2以上的做法。CHAMP通过F2层峰值的平均偏差为0.22 MHz(或2.6%)，标准偏差为0.8 MHz(或13.3%)。
Ionospheric plasma frequencies at the altitude of the CHAMP satellite have been deduced from ionosonde true‐height profiles for Jicamarca, Peru, and have been compared with the in situ measurements made by CHAMP. The differences between the plasma frequencies have been found to be well within the uncertainties associated with the ionosonde profiles, confirming the validity of the CHAMP measurements. For satellite‐ionosonde separations of less than 250 km and for satellite altitudes below the peak of the F2 layer, the average discrepancy between the two plasma frequencies is 0.25 MHz or 4%. For the most reliable ionosonde measurements, the average discrepancies reduce to 0.18 MHz (or 1.7%), with a standard deviation of 0.16 MHz (or 1.5%). Given the validity of the CHAMP plasma frequencies, corresponding ionosonde and CHAMP observations have been used to support the practice of extending the ionosonde profile above hmF2 by assuming a Chapman layer with a constant scale height equal to that of the lower side of the F2 layer peak. The average discrepancy for CHAMP passing above the peak of the F2 layer is 0.22 MHz (or 2.6%), and the standard deviation is 0.8 MHz (or 13.3%).