共查询到19条相似文献,搜索用时 93 毫秒
1.
太阳活动起源研究(Ⅰ):太阳活动周的经验和半经验模型 总被引:3,自引:1,他引:2
概括了从观测上发现的太阳活动主要特征,对Babcock的太阳活动周经验模型和Leighton的半经验模型分别作了阐述,简要讨论了与Babcock和Leighton模型有关的后续研究情况。 相似文献
2.
日面高纬黑子与太阳活动 总被引:2,自引:0,他引:2
利用云南天文台太阳黑子观测资料,对太阳活动第19 周至第22 周日面高纬度( 高于40°) 的黑子群进行了统计.结果表明:高纬黑子面积绝大部分小于100 ,平均56 ,寿命大部分为1 ~3 天,平均4 天;黑子分类绝大部分为AXX、HSX、BXO,其中AXX 约占总数的一半.高纬黑子在日面南北半球上的不对称分布可用来预报该太阳周内的太阳活动在南北半球上的主次.由此预报23 周太阳活动将在南半球更活跃 相似文献
3.
通过对12-22周((1878-1995年)太阳大黑子群分布南北半球不对称的整体特征的研究,探讨了太阳活动周的长期演化趋势.约定N与S分别表示北南半球大黑子群数之和,BN与BS为北南半球大黑子群的纬度和.由这4个物理量定义了太阳活动周的3个参量:(1)太阳活动不对称指数AS=(N-S)/(N+S);(2)平均纬度BT=(BN+BS)/(N+S),BS取负值;(3)太阳活动带的宽度BW=BN/N-BS/S.对上述11个活动周,得到了有关80年周期的性质及奇偶数周大黑子群数变化的有意义的统计结果. 相似文献
4.
简要介绍了国内外太阳活动研究的现状,指出由于太阳活动对地球和人类生活的影响,尤其是随着空间探测和技术的发展,对太阳活动研究的需求更加迫切,太阳活动研究受到各国政府和社会更大的重视。在这样的背景下,加上各种高新技术和卫星探测的进步,21世纪将迎来太阳活动研究的新时代。文中对我国未来太阳活动研究的方向、重点和措施也提出了建议。 相似文献
5.
6.
陈协珍 《中国天文和天体物理学报》1996,(2)
本文采用天体力学方法,考虑太阳系九大行星对太阳表面局部区域的摄动力,建立了太阳表面受行星起潮力的数值计算模型.利用此模型,针对历史上发生的100个大太阳耀斑事件,计算各耀斑区耀斑发生前后所受行星起潮力的变化.从耀斑发生的时间分布统计得到:在100个耀斑中,有75个耀斑发生在行星综合起潮力合力极大前后三天内.证明行星摄动对太阳活动有调制作用.最后,本文还对太阳活动起源、活动周期等问题进行了简要的讨论. 相似文献
7.
简要介绍了国内外太阳活动研究的现状 ,指出由于太阳活动对地球和人类生活的影响 ,尤其是随着空间探测和技术的发展 ,对太阳活动研究的需求更加迫切 ,太阳活动研究受到各国政府和社会更大的重视。在这样的背景下 ,加上各种高新技术和卫星探测的进步 ,2 1世纪将迎来太阳活动研究的新时代。文中对我国未来太阳活动研究的方向、重点和措施也提出了建议。 相似文献
8.
行星摄动力对太阳活动的调制 总被引:3,自引:0,他引:3
本采用天体力学方法,考虑太阳系九大行星对太阳表面局部区域的摄动力,建立了太阳表面受行星起潮力的数值计算模型。利用此模型,针对历史上发生的100个大太阳耀斑事件,计算各耀斑区耀斑发生前后所受行星起潮力的变化。从耀斑发生的时间分布统计得到:在100个耀斑中,有75个耀斑发生在行星综合起源力合力极大前后三天内。证明行星摄动对太阳活动有调制作用。最后,本还对太阳活动起源、活动周期等问题进行了简要的讨论 相似文献
9.
10.
魏晓雷 《中国天文和天体物理学报》1990,(4)
本文利用太阳活动区光球横向磁场观测资料推算纵向电流密度分布,论述了具体的计算方法和取得的结果,并简要讨论了太阳活动区电流计算在太阳物理研究中的应用。 相似文献
11.
The existence of prolonged periods of abnormally low solar activity (such as the Maunder minimum) is explained within the framework of Leighton's model of a solar cycle with a hypothetical internal magnetic field of the Sun taken into account. 相似文献
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13.
W. Hampel 《Astrophysics and Space Science》1997,258(1-2):117-131
The present status of solar neutrino detection is reviewed. Results from the Homestake, Kamiokande, Super-Kamiokande, GALLEX
and SAGE detectors all show a deficit when compared to recent standard solar model calculations. Two of these detectors, GALLEX
and SAGE, have recently been checked with artificial 51Cr neutrino sources. It is shown that astrophysical scenarios to solve
the solar neutrino problems are not favoured by the data. There is hope that the results of Super-Kamiokande and the forthcoming
solar neutrino experiments can provide the answers to the open questions.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
14.
Kenneth H. Schatten 《Solar physics》1973,32(2):315-336
An explanation for the solar differential rotation is proposed that makes use of angular momentum transfer in the solar wind and corona. Evidence suggests that for most of the solar cycle, the solar wind is connected by magnetic field lines to high heliographic latitudes on the Sun.Thus the angular momentum lost to the solar wind would present a preferential drag to the photospheric material at high heliographic latitudes. It is shown that this drag is sufficient to offset the restoring forces of the Sun's subsurface magnetic field. In fact, the subsurface magnetic field and differential rotation are thought to grow until the stresses are sufficient to balance the torque induced by the solar wind. The present level of differential rotation and solar activity may be maintained by an intricate feedback mechanism involving the whole solar activity cycle.A power calculation based upon this model suggests the Sun's core rotates with a period of between 0.5 and 5 days. Furthermore, this view requires a major change in present theory of solar magnetic field generation. 相似文献
15.
Solar Wind Forecasting with Coronal Holes 总被引:1,自引:0,他引:1
An empirical model for forecasting solar wind speed related geomagnetic events is presented here. The model is based on the
estimated location and size of solar coronal holes. This method differs from models that are based on photospheric magnetograms
(e.g., Wang–Sheeley model) to estimate the open field line configuration. Rather than requiring the use of a full magnetic
synoptic map, the method presented here can be used to forecast solar wind velocities and magnetic polarity from a single
coronal hole image, along with a single magnetic full-disk image. The coronal hole parameters used in this study are estimated
with Kitt Peak Vacuum Telescope He I 1083 nm spectrograms and photospheric magnetograms. Solar wind and coronal hole data for the period between May 1992 and
September 2003 are investigated. The new model is found to be accurate to within 10% of observed solar wind measurements for
its best 1-month period, and it has a linear correlation coefficient of ∼0.38 for the full 11 years studied. Using a single
estimated coronal hole map, the model can forecast the Earth directed solar wind velocity up to 8.5 days in advance. In addition,
this method can be used with any source of coronal hole area and location data. 相似文献
16.
主要论述宁静日冕洞,以及日冕加热问题的研究现状。讨论了宁静日冕的理论模型、观测模型和混合模型,以及冕洞区大气模型和太阳风加热问题。最后对计划中的日冕空间探测作了简要介绍。 相似文献
17.
Zadig Mouradian 《Solar physics》2013,282(2):553-564
This article proposes a unified observational model of solar activity based on sunspot number and the solar global activity in the rotation of the structures, both per 11-year cycle. The rotation rates show a variation of a half-century period and the same period is also associated to the sunspot amplitude variation. The global solar rotation interweaves with the observed global organisation of solar activity. An important role for this assembly is played by the Grand Cycle formed by the merging of five sunspot cycles: a forgotten discovery by R. Wolf. On the basis of these elements, the nature of the Dalton Minimum, the Maunder Minimum, the Gleissberg Cycle, and the Grand Minima are presented. 相似文献
18.
Our recent model for solar constant secular changes suggests that over extended time intervals, a positive correlation of the solar constant with solar activity results. The positive correlation in this model is not associated with the direct result of active region, which may be in a close energy balance over their lifetimes, but rather is associated with global features - bright global faculae. These exist as both polar and network features on the solar disk. The high latitude faculae enable the solar constant to peak prior to sunspot maximum. Recent solar constant observations support the model's general trend. Using this model, we now calculate a proxy solar constant for: (1) the past four centuries, based upon the sunspot record, (2) the past nine centuries, based upon 14C observations and their relation to solar activity, and (3) the next decade, based upon a dynamo theory model for the solar cycle. The proxy solar constant data is tabulated as it may be useful for climate modelers studying global climate changes. This could be helpful in disentangling possible solar influences from any anthropogenic changes associated with trace gas increases in the terrestrial atmosphere. An important point for climate modelers to consider in fixing climate model parameters, is that the Sun has been relatively active and thus bright in the latter half of the 20th century, compared with the past few centuries.This paper was presented at the third meeting of the Solar Cycle Workshop, held in Sydney, Australia, January 9–13, 1989.Physics Dept., Univ. of Northern Colorado, U.S.A. 相似文献
19.
研究发现,太阳自转速率的变化与太阳活动之间存在一定的联系,但是不同学者的研究结论存在着矛盾:有的认为两者为正相关,而有的却认为是负相关.究竟两者之间是什么关系,需要做进一步深入的分析.利用EEMD (Ensemble Empirical Mode Decomposition)等方法对太阳自转速率和太阳黑子数据序列进行相关关系以及相位关系的计算和分析,以探讨太阳自转速率变化与太阳活动之间的关系.研究发现:两者的长期趋势项分量呈显著负相关;在11 yr左右周期分量上,观测到的太阳自转速率滞后太阳黑子的变化约2 yr时,呈显著负相关关系,超前3 yr时呈现次显著的正相关;对太阳活动第12–23周各周内部太阳黑子与太阳自转速率的相关分析表明,两者的关系比较复杂,但负相关关系更为显著.这为进一步理解太阳活动变化与太阳自转速率变化之间的成因联系提供了新的依据. 相似文献