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尖峰辐射
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  spike emission
     In a layered model of definite solar atmosphere distance, eight events of spike emission, observed by the Beijing radio spectrograph in the 2.6-3.8GHz frequency range, are analyzed.
     在一个具有确定的太阳大气高度的分层模型中,研究了8个频率在2.6-3.8GHz区间的太阳尖峰辐射事件。
短句来源
     On the Microwave Millisecond Spike Emission and Its Associated Phenomena During the Impulsive Phase of Large Solar Flares
     耀斑脉冲相微波毫秒级尖峰辐射及其共生现象
短句来源
     Electron-Cyclotron Maser and Solar Microwave Millisecond Spike Emission
     电子回旋脉■和太阳微波毫秒级尖峰辐射
短句来源
     The narrow bandwidth of a solar radio spike is a characteristic parameter. Using this spike bandwidth not only the small-scale structure of spike source dimension can be calculated but also the theory of spike emission can be checked with the observations.
     太阳射电尖峰辐射(spike)的窄频带是一个具有特征性的参数,不但可从它计算出Spike辐射源区的小尺度结构,而且观测结果与Spike辐射理论可相互验证.
短句来源
     The metric and microwave spike emission with negative and positive frequency drift rate observed with radio spectrometers at Yunnan and Beijing observatories are presented.
     介绍了云南天文台和北京天文台频谱仪所观测到具有正、负频漂的米波Ⅲ型爆发和微波尖峰辐射
短句来源
  spike radiation
     The Analysis to the Event of Millisecond-Scalar Spike Radiation on 17 March 1989
     1989年3月17日太阳射电毫秒尖峰辐射事件的分析
短句来源
     The Characteristics of Duration and Frequency of Millisecond Fast Spike Radiation Events
     毫秒级快速尖峰辐射事件的时间和频率特性
短句来源
     Solar Radio Decimeteric Spike Radiation and Metric Radio Bursts
     太阳射电分米波尖峰辐射和米波射电爆发
短句来源
  “尖峰辐射”译为未确定词的双语例句
     Spikes Superimposed on A Great Microwave Type IVμ Burst
     叠加在微波IVμ型大爆发上的尖峰辐射
短句来源
     The Spike-like Structure in A Solare Microwave Burst on May 21,1990
     1990年5月21日微波爆发中的类尖峰辐射结构
短句来源
     76% of the total spikes have the absolute bandwidth of 1.4MHz (the spectral resolution of the instrument),hence the relative bandwidth is down to 0.1%.
     结果发现76%的尖峰的绝对带宽达到仪器频率分辨率1.4MHz,其相对带宽达到0.1%。 这比以前关于尖峰辐射带宽的统计结果要小很多。
短句来源
     Wavelet Transform and Its Applications to the Analysis of Solar Microwave Spikes
     小波变换在太阳微波尖峰辐射分析中的应用
短句来源
     After analyzing 158 radio bursts observed from September 2000 to September 2001 with the 0.7-1.5GHz spectrometer in Yunnan Observatory, we have found that there were fast fine structures (FFS) in 65% of the observed bursts. These fine structures are classified into four classes:millisecond spikes,type Ⅲ bursts,quasi-periodic pulsations,slowly drifting structures.
     通过分析云南天文台(YNO)0.7~1.5GHz太阳射电频谱仪2000年9月至2001年9月取得的158个射电爆发,发现其中约有65%存在4类不同类型的快速精细结构(FFS):毫秒尖峰辐射、Ⅲ型爆发、准周期脉动、慢漂移结构。
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  spike emission
Spike emission remains coupled to (cross-correlated with) stimulus events over time periods as long as 96 ms, implying that some stimulus drive or afferent visual input is delayed by as much as 96 ms more than other input.
      
In some cells, said to be "spatiotemporally inseparable", the delay (latency) varies systematically across the visual field; i.e., the place for optimal stimulation varies with the time prior to spike emission.
      
Spike emission is followed by an absolute refractory period (1 ms) and activates an inhibitory delay loop that prevents continuous firing.
      
This phenomenon is quite different from radio spike emission at decimeter and long centimeter wavelengths.
      
The spike emission very likely yields an upper limit.
      
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  spike radiation
MHD oscillations in radio spike radiation observed on May 16, 1981
      
We discovered quasi-periodic oscillation characteristics of 1.4-1.6 s in the spike radiation of the typical microwave outburst observed on May 16, 1981.
      
These affect the growth rates of the ECM instability and so quasi-periodic oscillations in the spike radiation are generated.
      


From the comparing of the observational data of the microwave millisecond spike emissions (MMSE's) and the associated optical, radio and hard X-ray phenomena during the impulsive phase of large solar flares on May 16 and Oet. 12, 1981, we found that strong MMSE's occurred during the event of May 16, 1981 and no MMSE appeared but more intense microwave burst at 10.6 cm during the event of Oct. 12. We proposed a model and utilized the mechanism of electron-cyclotron instability associated with a hollow-beam of...

From the comparing of the observational data of the microwave millisecond spike emissions (MMSE's) and the associated optical, radio and hard X-ray phenomena during the impulsive phase of large solar flares on May 16 and Oet. 12, 1981, we found that strong MMSE's occurred during the event of May 16, 1981 and no MMSE appeared but more intense microwave burst at 10.6 cm during the event of Oct. 12. We proposed a model and utilized the mechanism of electron-cyclotron instability associated with a hollow-beam of electrons to account for the physical reasons. Further, we showed that there exist some intimate links between MMSE's and the associated phenomena in the physical processes of generation and evolution during the impulsive phase of large flares. Obviously, the discovery of these links with one another i.s important for clarifying the mechanism of large solar flares.

本文根据1981年5月16日和10月12日光学、射电、硬X射线等观测资料的对比,提出了一个模型,解释了太阳大耀斑脉冲相微波毫秒级尖峰辐射的一些特征及其与各种共生现象(例如Ⅲ型、Ⅳ_(DCIM)型和硬X射线爆发等)物理过程之间的内在联系。

A mechanism of solar microwave millisecond spike emission is presented in this paper. Once after a beam of nonthermal electrons is injected downwards into a magnetic arch, it will form a hollow beam distribution, which drives electron-cyclotron maser (ECM) to emit electromagnetic radiation.Assuming the hollow beam to be a Gaussian distribution, we calculated the growth rate of X-mode at the second harmonic. By solving the diffusion equation we obtained the evolution of the distribution of nonthermal electrons,...

A mechanism of solar microwave millisecond spike emission is presented in this paper. Once after a beam of nonthermal electrons is injected downwards into a magnetic arch, it will form a hollow beam distribution, which drives electron-cyclotron maser (ECM) to emit electromagnetic radiation.Assuming the hollow beam to be a Gaussian distribution, we calculated the growth rate of X-mode at the second harmonic. By solving the diffusion equation we obtained the evolution of the distribution of nonthermal electrons, the variation of the growth rate vs. time, the saturation time of ECM, tsat, and the saturation energy density of the waves.Takingwhere ns is the number density of nonthermal electrons, we find out that millisecond spike emission (tsat=0.42ms) with very high brightness temperature (Tb=5×1015K) would be produced at frequency ω=2π×2.84 GHz, in accordance with the observation of the spike event on May 16, 1981.It is also found that the maser emission propagates within a thin surface layer of a cone stretching an angle of about 65° around the magnetic field.As the distribution of nonthermal electrons evolves, the transverse velocity component decreases while the parallel one does not. As a result, when the pitch angle diminishes, the electrons can penetrate through the magnetic mirror points and rush into the transition region to produce hard X-ray bursts.

本文提出由非热电子(60keV)的空心束(hollow beam)分布激发回旋脉降作为太阳微波毫秒级尖峰辐射的产生机制。文中求得了非常波模二次谐波的增长率及其随时间的变化、脉泽的饱和时间、饱和波能密度及脉降辐射的方向特征。 结果得到,当磁场强度B=507G,等离子体数密度n_(?)=4×10~9cm~(-3),电子温度T_e=1.4×10~6K,非热电子数密度与热电子数密度之比(n_s/n_e)≈4×10~(-5),磁场标高时,将在2.84GHz频率上产生高亮温度(T_b≈5×10~(15)K)的毫秒级尖峰辐射

In this paper the restriction of the classica theory for tearing mode is discussed. It is suggested that the periodicity of tearing mode must be considered, and its induced electric field will meet the requirement of millisecond radio spikes in solar flares for energetic particles. So, it is a possible mechanism for particle acceleration. On the other hand, the period of tearing mode is in agreement with the time scale of a single spike, and the characteristic time of the exponential growth in tearing mode can...

In this paper the restriction of the classica theory for tearing mode is discussed. It is suggested that the periodicity of tearing mode must be considered, and its induced electric field will meet the requirement of millisecond radio spikes in solar flares for energetic particles. So, it is a possible mechanism for particle acceleration. On the other hand, the period of tearing mode is in agreement with the time scale of a single spike, and the characteristic time of the exponential growth in tearing mode can be compared with the time scale of a group of spikes. Therefore, the evolution of radio spikes may be related to the periodicity of energetic particle beam and electric field.

本文讨论了经典撕裂模理论的局限性,提出在考虑撕裂模的周期振荡后,其感应电场的大小及时空尺度均能满足太阳耀斑中的毫秒级射电尖峰所提供的高能粒子的信息,从而给耀斑粒子的一次加速提出了一种可能的机制。另一方面,撕裂模的周期与单个尖峰的宽度可对应,而撕裂模指数增长的特征时间又恰好与射电尖峰群的典型宽度具有同一量级,因此,快速尖峰辐射的时间结构很可能是由高能粒子流即加速电场本身的准周期性所决定。

 
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