Statistical analysis of solar activity variations of total electron content derived at Jet Propulsion Laboratory from GPS observations
Statistical analysis of solar activity variations of total electron content derived at Jet Propulsion Laboratory from GPS observations
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喷气推进实验室根据 GPS 观测得出的太阳活动总电子含量变化的统计分析
DOI：
10.1029/2009ja014533
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发表时间：
2009-10
影响因子：
2.8
通讯作者：
Chen, Yiding
中科院分区：
文献类型：
--
作者：
Liu, Libo;Chen, Yiding
利用喷气推进实验室（Jet Propulsion Laboratory）全球定位系统（GPS）观测的总电子含量（TEC）数据，分析了TEC在全球尺度上的太阳活动效应。太阳极紫外线（EUV）0.1-50 nm波长通量、10.7 cm射电通量F10.7和F10.7P（日平均F10.7和81天平均F10.7A）的日值分别代表太阳EUV变率。利用太阳日光层观测站（SOHO）上的太阳极紫外监测器（SEM）光谱仪测量了极紫外辐射通量。在TEC与F10.7P和EUV中可以检测到三种模式（线性、饱和和放大）。白天TEC与F10.7之间存在饱和特征，低纬比中高纬更明显。赤道异常区的饱和度在春分时最强，在夏至时最弱。与此相反，TEC的放大，作为一个新的特征，主要分布在北方的中，高纬度地区在十二月冬至和南半球在六月冬至和三月春分。这是第一次，以确定在TEC的线性，饱和和扩增模式分布的位置和时间。TEC对太阳活动的敏感性白天强于夜间，低纬度地区强于高纬度地区。赤道和低纬度地区的TEC依赖于太阳活动的速率在倾角赤道附近有一个最小值，在倾角赤道两侧（靠近赤道异常的顶部）有一个最大值。这种结构大致沿着倾角赤道排列，在春分点最强，在6月至日最弱，这突出了与E × B漂移有关的电离层动力学的重要性。此外，该分析证实，在统计意义上，二次多项式可以很好地捕获指定本地时间的TEC的长期太阳活动依赖性。
We analyzed the data series of the total electron content (TEC) derived at Jet Propulsion Laboratory from Global Positioning System (GPS) observations to investigate the solar activity effects of TEC on a global scale. The daily values of the solar extreme ultraviolet (EUV) fluxes in 0.1–50 nm wavelengths, 10.7 cm radio flux F10.7, and F10.7P (the average of daily F10.7 and its 81‐day mean F10.7A) are adopted to represent the solar EUV variability, respectively. The EUV fluxes are measured by the Solar EUV Monitor (SEM) spectrometer aboard Solar Heliospheric Observatory (SOHO). Three kinds of patterns (linearity, saturation, and amplification) can be detected in TEC versus F10.7P and EUV. A saturation feature exists in TEC versus F10.7 in the daytime, more pronounced at low latitudes than at middle and high latitudes. The saturation in the equatorial anomaly regions is strongest in equinoxes and weakest in the June solstice. In contrast, the amplification in TEC, as a novel feature, is mainly distributed in the northern middle, and high latitudes in the December solstice and in the Southern Hemisphere in the June solstice and the March equinox. It is the first time to determine where and when the linear, saturation, and amplification patterns are distributed in TEC. Further, the solar activity sensitivity of TEC is stronger at day than at night and more evident at lower latitudes than at higher latitudes. The solar activity dependent rates of TEC in the equatorial and low‐latitude regions have a minimum around the dip equator and maxima on both sides of the dip equator (near the crest of the equatorial anomaly). This structure is roughly aligned along the dip equator, being strongest in equinoxes and weakest in the June solstice, which highlights the importance of ionospheric dynamics related with E × B drift. In addition, this analysis confirms that in a statistical sense, a quadrate polynomial can well capture the long‐term solar activity dependency of TEC at specified local time.
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影响因子：
1.9
作者：
D. Burešová;J. Laštovička
通讯作者：
D. Burešová;J. Laštovička
根据全球电离探空仪数据得出的等效风的太阳活动变化
DOI：
10.1029/2004ja010574
发表时间：
2004-12
期刊：
J. Geophys. Res
影响因子：
--
作者：
Libo Liu;X. Luan;W. Wan;J. Lei;B. Ning
通讯作者：
B. Ning
DOI：
10.1016/0045-8732(83)90106-7
发表时间：
1978
期刊：
--
影响因子：
--
作者：
K. Rawer;S. Ramakrishnan;D. Bilitza
通讯作者：
K. Rawer;S. Ramakrishnan;D. Bilitza
影响因子：
1.9
作者：
J. K. Gupta;L. Singh
通讯作者：
J. K. Gupta;L. Singh
影响因子：
0.9
作者：
D. Pancheva;P. Mukhtarov
通讯作者：
D. Pancheva;P. Mukhtarov