太阳黑子活动周期对中国大陆西部不同震级段地震的影响探讨与分析

用快速富里叶变换(FFT)计算得出太阳黑子有11 a、51 a、103 a的优势周期,通过太阳黑子的活跃周期与中国大陆西部(E108°以西)不同震级段地震的活跃周期进行了对比研究,发现M.6.5以上地震受太阳黑子的影响相对弱一些,其平均周期为2.7a;而Ms5.0～6.5受太阳黑子的影响可能相对强一些,其平均周期为11.4 a.分析认为Ms≥6.5地震地周期与太阳黑活跃周期存在倍数关系,Ms5.0～6.5的周期与太阳黑子活跃周期比较相近,计算得出1950年以来地震波能量释放与太阳黑子周期有一定关系,总体表明太阳黑子活动对不同震级地震均有一定影响,但对中强地震的影响要更明显一些.     

太阳黑子与全球强震活动

根据NGDC提供的太阳黑子资料,分析了太阳黑子活动与地球上巨震活动的关系。一般来说,强震发生的平均相位角大致在69 5°～103 7°和256 3°～290 5°之间,在每个太阳黑子活动的双周中,强震容易在黑子活动的峰值出现,而在太阳黑子活动的单周中,强震较易在黑子活动的谷值出现,并指出在今后3～4年内,欧亚大陆发生8级以上巨震的可能性很大。     

山西中北部地区地震与太阳黑子活动关系分析

太阳黑子活动与地震关系的研究是一个引起很多专家重视的问题,专家们用不同的思路、不同的震例做了大量的工作.从现有的研究来看,太阳黑子活动对地震的影响在各地并不相同,也就是说有明显的地区特点,对于某一区来说,可能有较好的对应.     

辽西地震活动与太阳黑子活动的相关性分析

本文分析讨论了太阳黑子活动与辽西地震活动的关系。发现１９６６年以来辽西地震活动强度与太阳黑子活动强度之间存在着一定的负相关性，辽西以往发生的３次≥５级地震均位于太阳黑子活动的低谷之后不久，据此，结合可公度预测结果认为：辽西下一次≥５级地震很有可能发生在太阳黑子活动的第２２周末的１至２年间的１９９９年上半年前后。     

太阳黑子、地球自转与华北地区中强震关系研究

运用Morlet小波分解方法检验太阳黑子相对数变化的显著周期,并分析太阳黑子数活动的趋势。运用太阳黑子和地球自转数据分析两者对华北地区中强地震的影响。结果显示,太阳黑子相对数变化、地球自转速率变化与华北地区中强地震活动水平存在较好的对应关系。当太阳黑子相对数周期上升段与地球日长数据Demy小波三阶分解的18.6年周期波谷段叠加时,对华北地震活动的影响达到最大,存在触发区域内中强地震发生的可能。     

太阳黑子、磁暴与地震活动的关系

本文用格林威治台1904——1953年的太阳黑子与磁暴资料及国家地震局编的全球7级以上地震的同期资料,对太阳黑子、磁暴与地震的关系作了统计分析。主要有以下几点结果: 1.太阳黑子、磁暴与地震数的逐年变化之间经11年流动平均后具有相当高的相关性,而后者与地震的相关性更显著; 2.地震频率的季节分布在统计上有类似磁暴的季节分布的倾向; 3.太阳黑子、磁暴对地震的触发作用有一个滞后效应,前者为3——4个月,后者为1——3个月;也还出现有同时性效应; 4.太阳黑子周期内地震最多的年份常发生在太阳黑子下降相位期间。      

太阳黑子活动及地球自转对江苏及邻区地震的影响分析

根据太阳黑子活动和地球自转数据,分析了两者对江苏及邻区中强地震的影响.结果显示:太阳黑子活动下降段及地球自转加速度上升和转折段有利于该地区中强地震的发生;且在太阳黑子活动的下降时间内,每一个地球自转加速度的转折都会使得该地区中小地震频度增高:另外,从幅相法统计以及太阳黑子活动预测数据来看,2012年2月以后江苏及邻区的...     

中国西部及邻区百年尺度周期的地震活动及其和太阳活动之间的负相关性

利用小波变换分析中国西部及邻区1700年以来M≥7级和M-T图分析1700年以来M≥7.8级地震活动,除了得到和其他学者研究基本一致的几个十年尺度周期结果外,还得到百年左右尺度的地震活动周期结果,再与太阳黑子活动进行比较,发现地震活动与太阳黑子数在百年左右尺度周期上具有负相关性,地震高活动时段对应太阳黑子低值时段.此外...     

太阳黑子活动对地球地震活动的影响浅析

利用调和分析以及小波分解与重构等信息挖掘方法,对1749年来的太阳黑子月统计数据,1920年来全球地震目录MS6.0以上地震年统计数据,1950年来华北地区ML4.7级以上地震目录,地球自转速率1832—1997年的年统计数据及1962年来的月统计数据,进行对比分析,研究发现:(1)在太阳活动处于强烈期时,地球大震处于高发期且略滞后2～5年,而此时地球自转速率处于减速期,其时间跨度约22年。(2)对于太阳黑子数11年的周期变化,在正常变化下如果处于低值期,期间地球地震活动也将增加,但地震发震时间滞后1～2年。考虑太阳黑子与日冕活动有继承性及延迟性的特点,我们认为引起11年左右的地震群活动可能不是直接受太阳黑子的影响,而是受太阳日冕活动影响。因为日冕抛射物在太阳黑子磁场弱化1年左右时爆发,使得太阳外层扁率增加并经常抛射一次性质量高达1013 kg的物质,从而导致地球自转速率因摄动效应而发生同步性减慢,以及地球地震活动增强。     

制约和影响中国大陆地震活动大形势的动力因素研究

从地球动力学角度,研究制约和影响我国大陆地震活动的兴衰起伏的内在原因,揭示我国大陆地震活动期（３００年）、幕（２０年左右）、段（几年）实际是由于太阳黑子活动、地球自转速率变化、全球强震活动水平在不同阶段迭加和组合的结果。     

太阳黑子相对数最强周期的小波分析

利用小波变换,分析了1749年以来每个太阳活动周太阳黑子相对数的最强周期以及第1～22太阳活动周的最强周期. 分析结果表明,在第5和第6个太阳活动周,太阳黑子相对数最强的周期分别为64.67年和69.31年;在第13～15太阳活动周,太阳黑子相对数的最强周期分别为98.02年,105.06年和105.06年. 在第1～22太阳活动周中,太阳黑子相对数最强的周期是128个月,约10.67年,其他太阳活动周的最强周期介于9.29～11.43年之间. 本文最后给出了128个月周期的幅度随时间的变化.     

Lunar and solar daily variations of the geomagnetic field at Toolangi

Summary Mean hourly values of magnetic declination, horizontal intensity and vertical intensity observed at Toolangi during two ten year periods (1924–1933 and 1949–1958) have been analysed to determine their solar and luni-solar diurnal components. The results, showing the variations of the first four harmonic components with season, degree of magnetic activity and annual sunspot number, are tabulated and discussed. It is shown that there are marked differences in the dependence ofS andL on the various parameters and a tentative explanation of this phenomenon is given.     

Influence of solar ultraviolet radiation intensity of 630 nm nightglow emission excitation

It is well known that the 630.0 nm nightglow emission intensity at mid-latitudes increased more than twofold in periods of maximum sunspot activity. It is assumed that this phenomenon is caused by variations in solar ultraviolet radiation intensity in solar activity cycles (Fishkova, 1983).     

磁暴活动与云南新一轮地震活跃期分析

对通海地磁台记录的磁暴(K指数≥5)年频次分析发现,磁暴活动的周期有强弱之分,与云南省地震活跃期和平静期对比分析看到,磁暴活动较强的周期时段与云南地震的活跃期相对应,磁暴活动较弱的周期时段与云南地震活动平静期相对应.目前,云南地震平静期已持续15年,即将进入第Ⅴ活跃期,大震发生的危险逐日增强.磁暴发生的数目和太阳活动有...     

Seasonal changes in zooplanktonic alkaline phosphatase activity in Toulon Bay (France): the role of Cypris larvae

We studied zooplankton contribution to the total particulate phosphatase activity, the kinetics of this activity, the relation to the different taxonomic groups and the role of particle-bound bacteria. The activity of total particulate material collected from a liter of seawater was more elevated in May, June and August than during the rest of the year. These high activities resulted from a high contribution of the >90 microm fraction which account then for more than 60% of the total particulate activity. Two Michaelian processes with high and low V(max) were disclosed on this fraction. The high V(max) component was responsible for the high summer activities. During these periods, high densities of cirriped Cypris were found which were statistically correlated with this high V(max) component as with its specific activity. Moreover, the contribution of attached bacteria to these high activities was low. In return, this contribution was predominant during the periods of low activity. A simple method was developed to characterise this bacterial activity.     

Time evolution of cosmic-ray intensity and solar flare index at the maximum phase of cycles 21 and 22

Analysis of the time series into trigonometric series allows the investigation of cosmic-ray (CR) intensity variations in a range of periodicities from a few days to 1 year. By this technique the amplitude and the phase of all observed fluctuations can be given. For this purpose, daily CR intensity values recorded at Climax Neutron Monitor station for the time intervals 1979–1982 and 1989–1991, which correspond to the epochs of maximum activity for solar cycles 21 and 22, respectively, have been studied. The data analysis revealed the occurrence of new periodicities, common or not, in the two solar maxima. A search of our results was done by a power spectral analysis determining independently possible systematic periodic or quasi-periodic variations. Based on the fact that during these maxima the CR intensity tracks the solar flare index better than the sunspot number, the same analysis was performed on these data, which are equivalent to the total energy emitted by the solar flares. Both analyses result in periodicities with different probability of occurrence in different epochs. Occurrence at peaks of 70, 56, 35, 27, 21 and 14- days were observed in all time series, while the periods of 140–154 and 105 days are reported only in the 21st solar maximum and are of particular importance. All of the short-term periods except of those at 27 and 154-days are recorded for first time in CR data, but they had already been observed in the solar activity parameters. Moreover, each parameter studied here has a very different power spectrum distribution in periods larger than 154 days. The possible origin of the observed variations in terms of the CR interaction in the upper atmosphere and the solar cavity dynamics is also discussed here.     

Long-period oscillations of sunspots according to simultaneous ground-based and space observations

An analysis of oscillatory processes with periods not shorter than several tens of minutes in three isolated sunspots, which were observed during identical periods in the optical and radio bands, is illustrated. SDO/HMI magnetograms at an interval of 45 s and radio maps at a wavelength of 1.76 cm, obtained using a Nobeyama radioheliograph (NoRH), have been used. The time profiles, which were constructed based on the NoRH and SDO/HMI data, indicate that the oscillations of the radioemission correlate with those of the sunspot magnetic field. The wavelet spectra and cross-wavelet transform reveal common oscillation periods of 30–40, 70–100, and 150–200 min. The identical oscillation periods, found using fundamentally different methods from ground-based and space observations, confirm the solar nature of these oscillations, which can be interpreted as oscillations of a sunspot as a whole.     

太阳黑子活动与新疆强震活动的关系

使用1900年以来的太阳黑子数据,统计分析了其与新疆地区MS≥6.6强震的关系。结果显示：新疆地区69%的MS≥6.6和86%的MS≥7的地震,发生在黑子数月均值≤35的时段内。以黑子数月均值≤20和≤35的时段作为MS≥6.6强震的预测指标,报准率分别为71%和64%;以黑子数月均值≤35的时段作为MS≥6.6强震的预测指标,报准率为69%。R值评分检验表明,上述预测指标是有效的。最后使用这些统计关系和指标对新疆未来几年发生强震的可能性作了估计。     

Dependence of time derivative of horizontal geomagnetic field on sunspot number and aa index

This work investigated an interrelationship between the monthly means of time derivatives of horizontal geomagnetic field, dH/dt, sunspot number, R _z , and aa index for the period of substorms (from ?90 to ?1800 nT) during the years 1990–2009. A total of 232 substorms were identified during the period of study. The time derivative of horizontal geomagnetic field, dH/dt, used as a proxy for geomagnetically induced current (GIC) exhibited high positive correlation with sunspot number (0.86) and aa index (0.8998). The obtained geomagnetic activity is in 92.665% explicable by the combined effect of sunspot number and aa index. The distribution of substorms as a function of years gives a strong support for the existence of geomagnetic activity increases, which implies that as the sunspot number increases the base level of geomagnetic activity increases too.     

Long-term variations of solar magnetic fields derived from geomagnetic data

There are limited homogeneous instrumental observations of the sunspot magnetic fields, but the Earth is a sort of a probe reacting to interplanetary disturbances which are manifestation of the solar magnetic fields. We find correlations between some parameters of geomagnetic activity (the geomagnetic activity “floor”—the minimum value under which the geomagnetic activity cannot fall in a sunspot cycle, and the rate of increase of the geomagnetic activity with increasing sunspot number), and sunspot magnetic fields (the sunspot magnetic field in the cycle minimum, and the rate of increase of the sunspot magnetic field from cycle minimum to cycle maximum). Based on these correlations we are able to reconstruct the sunspot magnetic fields in sunspot minima and maxima since sunspot cycle 9 (mid 19th century).