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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Daytime ionospheric equatorial vertical drifts during the 2008–2009 extreme solar minimum
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Daytime ionospheric equatorial vertical drifts during the 2008–2009 extreme solar minimum

机译：白天赤道电离层垂直漂移在2008 - 2009年极端的太阳

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摘要

One of the most interesting observations made by the Communication/Navigation Outage Forecasting System (C/NOFS) satellite mission was the detection of average equatorial ionospheric vertical drifts that largely differed from model predictions. C/NOFS measurements showed, in particular, downward drifts in the afternoon sector, and upward drifts around local midnight hours during the 2008 and 2009 extreme solar minimum. The unexpected behavior of the drifts has important implications for ionospheric modeling and suggests the necessity for a better understanding of the low-latitude electrodynamics. We used ground-based radar measurements to quantify the seasonal and solar flux variability of daytime equatorial drifts at lower altitudes (～150 km) than those probed by C/NOFS (above ～400 km).We found that average vertical drifts at 150 km altitude are in good agreement with model predictions of F region drifts and did not show the signatures of an enhanced semidiurnal pattern, as seen by C/NOFS. Comparison of the 150 km echo drifts with model predictions also shows that the increase (decrease) with height of the vertical drifts in the morning (afternoon) hours is a regular feature of the equatorial ionosphere. It occurred in all seasons and solar flux conditions between 2001 and 2011.
机译：其中最有趣的观察通信/导航故障预测系统(C / nof)是卫星任务检测平均赤道电离层垂直漂移很大程度上不同于模型预测。下午,向下漂移部门和向上飘在当地午夜小时在2008年和2009年极端的太阳能最小值。对电离层有重要影响建模和显示一个更好的必要性对低纬度的理解电动力学。测量量化季节性和太阳能白天赤道漂移的通量变化比低海拔地区(~ 150公里)探测C / nof(上图~ 400公里)。在150公里的高度垂直漂移在好协议与模型预测F的地区飘,不显示的签名增强半日模式,所看到的C / nof。比较150公里的回波模型预测也显示,增加(减少)的高度垂直漂移经常早上(下午)小时赤道电离层的特征。在所有季节和太阳能通量之间的条件2001年和2011年。

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