Hysteresis of foF2 at European middle latitudes
Hysteresis of foF2 at European middle latitudes
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DOI：
10.1007/s00585-000-0987-9
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发表时间：
2000-08
影响因子：
1.9
通讯作者：
D. Burešová;J. Laštovička
中科院分区：
文献类型：
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作者：
D. Burešová;J. Laštovička
研究了太阳周期20和21的太阳周期最小值之前和之后几年的春分月份的整个24小时昼夜间隔内几个欧洲台站的F2滞后现象。根据以前的结果，滞后预计将发展最好的只是为春分月和附近的太阳活动周期的最低点。滞后通常被发现是负的，即与太阳周期的下降分支相比，上升分支的foF2更高。然而，在某些年份的某些月份，情况并非如此。中午滞后定性地（就符号而言）而非定量地表示一天中其他时间的滞后。这种滞后现象在春季从一个太阳活动周期到另一个太阳活动周期是相对持久的，而在秋季则不是。弹簧时间滞后的典型值约为0.5 MHz。将滞后现象纳入长期电离层和无线电波传播预测仍然值得怀疑。
The hysteresis offoF2 is studied for several European stations over the whole 24-hour diurnal interval for the equinoctial months of the years just before and just after the solar cycle minimum for solar cycles 20 and 21. Based on previous results, the hysteresis is expected to develop best just for the equinoctial months and near the solar cycle minimum. The hysteresis is generally found to be negative, i.e. higherfoF2 for the rising branch compared to the falling branch of solar cycle. However, this is not the case in some individual months of some years. The noontime hysteresis represents the hysteresis at other times of the day qualitatively (as to sign) but not quantitatively. The hysteresis appears to be relatively persistent from one solar cycle to another solar cycle in spring but not in autumn. A typical value for springtime hysteresis is about 0.5 MHz. The inclusion of hysteresis into long-term ionospheric and radio wave propagation predictions remains questionable.