The meteor radar can detect the zenith angle,azimuth,radial velocity,and altitude of meteor trails so that one can invert the wind profiles in the mesosphere and low thermosphere(MLT)region,based on the Interferometri...The meteor radar can detect the zenith angle,azimuth,radial velocity,and altitude of meteor trails so that one can invert the wind profiles in the mesosphere and low thermosphere(MLT)region,based on the Interferometric and Doppler techniques.In this paper,the horizontal wind field,gravity wave(GW)disturbance variance,and GW fluxes are analyzed through the meteor radar observation from 2012−2022,at Mohe(53.5°N,122.4°E)and Zuoling(30.5°N,114.6°E)stations of the(Chinese)Meridian Project.The Lomb−Scargle periodogram method has been utilized to analyze the periodic variations for time series with observational data gaps.The results show that the zonal winds at both stations are eastward dominated,while the meridional winds are southward dominated.The variance of GW disturbances in the zonal and meridional directions increases gradually with height,and there is a strong pattern of annual variation.The zonal momentum flux of GW changes little with height,showing weak annual variation.The meridional GW flux varies gradually from northward to southward with height,and the annual periodicity is stronger.For both stations,the maximum values of zonal and meridional wind occur close to the peak heights of GW flux,with opposite directions.This observational evidence is consistent with the filtering theory.The horizontal wind velocity,GW flux,and disturbance variance of the GW at Mohe are overall smaller than those at Zuoling,indicating weaker activities in the MLT at Mohe.The power spectral density(PSD)calculated by the Lomb−Scargle periodogram shows that there are 12-month period and 6-month period in horizontal wind field,GW disturbance variance and GW flux at both stations,and especially there is also a 4-month cycle in the disturbance variance.The PSD of the 12-month and 6-month cycles exhibits maximum values below 88 km and above 94 km.展开更多
SS 433是目前为止唯一一个被同时检测到轨道周期、超轨道周期和章动周期且存在双向螺旋状喷流的X射线双星系统,通过研究它的X射线光变将有助于理解系统的动力学过程及与其他波段的相关性.利用Lomb-Scargle周期图法(简称LS周期图)和加权...SS 433是目前为止唯一一个被同时检测到轨道周期、超轨道周期和章动周期且存在双向螺旋状喷流的X射线双星系统,通过研究它的X射线光变将有助于理解系统的动力学过程及与其他波段的相关性.利用Lomb-Scargle周期图法(简称LS周期图)和加权小波Z变换法(Weighted Wavelet Z-transform,WWZ)对SS 433的Swift/BAT(Burst Alert Telescope)(15–50 ke V)和RXTE/ASM(Rossi X-Ray Timing Explorer/All-Sky Monitor)(1.5–3,3–5和5–12 ke V)光变曲线进行周期提取,并对得到的周期成分进行蒙特卡洛仿真.其中15–50 ke V能段:检测到5个较强的周期成分P_1(～6.29 d)、P_2(～6.54 d)、P_3(～13.08 d)、P_4(～81.50 d)和P_5(～162.30 d);3–5和5–12 ke V能段:都检测到P_3(～13d)和P_5(～162 d)的周期成分;1.5–3 ke V能段:未检测到任何明显的周期存在.3–5、5–12和15–50 ke V能段的功率谱上最强的周期信号均为P_5,且P_5与之前对光学光变曲线研究得到的结果一致,结合SS 433的螺旋形射电喷流,推测周期为～162 d的X射线和光学波段光变与相对论性喷流的进动有关,X射线与光学光变周期的一致性也表明两个波段的辐射机制有内秉联系.P_3与之前研究中检测到的系统轨道周期(～13.07 d)一致,P_2和P_4则分别为P_3和P_5的一个高频谐波成分.P_1成分仅在15–50 ke V能段的功率谱中被检测到,且它与系统的章动周期一致.随着能段能量的降低(硬X射线到软X射线),所检测到的周期成分却越来越少,这一结果很好地印证了高能段(硬X射线)辐射主要来自于喷流,低能段(软X射线)辐射则可能是由双星系统周围的介质主导.通过分析得到的多个X射线光变周期,为今后SS 433的多波数据分析、系统的动力学机制等研究提供有力的参考依据.展开更多
基金supported by the Fundamental Research Funds for the Central Universities,CHD(NO.300102263205 and NO.300102264916)the West Light Cross-Disciplinary Innovation team of Chinese Academy of Sciences(NO.E1294301).supported by the Fundamental Research Funds for the Central Universities,CHD(NO.300102263205 and NO.300102264916)the West Light Cross-Disciplinary Innovation team of Chinese Academy of Sciences(NO.E1294301).
文摘The meteor radar can detect the zenith angle,azimuth,radial velocity,and altitude of meteor trails so that one can invert the wind profiles in the mesosphere and low thermosphere(MLT)region,based on the Interferometric and Doppler techniques.In this paper,the horizontal wind field,gravity wave(GW)disturbance variance,and GW fluxes are analyzed through the meteor radar observation from 2012−2022,at Mohe(53.5°N,122.4°E)and Zuoling(30.5°N,114.6°E)stations of the(Chinese)Meridian Project.The Lomb−Scargle periodogram method has been utilized to analyze the periodic variations for time series with observational data gaps.The results show that the zonal winds at both stations are eastward dominated,while the meridional winds are southward dominated.The variance of GW disturbances in the zonal and meridional directions increases gradually with height,and there is a strong pattern of annual variation.The zonal momentum flux of GW changes little with height,showing weak annual variation.The meridional GW flux varies gradually from northward to southward with height,and the annual periodicity is stronger.For both stations,the maximum values of zonal and meridional wind occur close to the peak heights of GW flux,with opposite directions.This observational evidence is consistent with the filtering theory.The horizontal wind velocity,GW flux,and disturbance variance of the GW at Mohe are overall smaller than those at Zuoling,indicating weaker activities in the MLT at Mohe.The power spectral density(PSD)calculated by the Lomb−Scargle periodogram shows that there are 12-month period and 6-month period in horizontal wind field,GW disturbance variance and GW flux at both stations,and especially there is also a 4-month cycle in the disturbance variance.The PSD of the 12-month and 6-month cycles exhibits maximum values below 88 km and above 94 km.
文摘SS 433是目前为止唯一一个被同时检测到轨道周期、超轨道周期和章动周期且存在双向螺旋状喷流的X射线双星系统,通过研究它的X射线光变将有助于理解系统的动力学过程及与其他波段的相关性.利用Lomb-Scargle周期图法(简称LS周期图)和加权小波Z变换法(Weighted Wavelet Z-transform,WWZ)对SS 433的Swift/BAT(Burst Alert Telescope)(15–50 ke V)和RXTE/ASM(Rossi X-Ray Timing Explorer/All-Sky Monitor)(1.5–3,3–5和5–12 ke V)光变曲线进行周期提取,并对得到的周期成分进行蒙特卡洛仿真.其中15–50 ke V能段:检测到5个较强的周期成分P_1(～6.29 d)、P_2(～6.54 d)、P_3(～13.08 d)、P_4(～81.50 d)和P_5(～162.30 d);3–5和5–12 ke V能段:都检测到P_3(～13d)和P_5(～162 d)的周期成分;1.5–3 ke V能段:未检测到任何明显的周期存在.3–5、5–12和15–50 ke V能段的功率谱上最强的周期信号均为P_5,且P_5与之前对光学光变曲线研究得到的结果一致,结合SS 433的螺旋形射电喷流,推测周期为～162 d的X射线和光学波段光变与相对论性喷流的进动有关,X射线与光学光变周期的一致性也表明两个波段的辐射机制有内秉联系.P_3与之前研究中检测到的系统轨道周期(～13.07 d)一致,P_2和P_4则分别为P_3和P_5的一个高频谐波成分.P_1成分仅在15–50 ke V能段的功率谱中被检测到,且它与系统的章动周期一致.随着能段能量的降低(硬X射线到软X射线),所检测到的周期成分却越来越少,这一结果很好地印证了高能段(硬X射线)辐射主要来自于喷流,低能段(软X射线)辐射则可能是由双星系统周围的介质主导.通过分析得到的多个X射线光变周期,为今后SS 433的多波数据分析、系统的动力学机制等研究提供有力的参考依据.
