YNAO OpenIR研究单元&专题: 抚仙湖太阳观测和研究基地
http://ir.ynao.ac.cn:80/handle/114a53/47
2024-03-28T14:10:39Z
2024-03-28T14:10:39Z
一种法珀滤光器的控制电路
许骏
史会贤
http://ir.ynao.ac.cn:80/handle/114a53/26420
2024-03-27T09:05:54Z
2024-03-27T09:05:53Z
题名: 一种法珀滤光器的控制电路
作者: 许骏; 史会贤
摘要: 本申请涉及微光探测技术领域,尤其涉及一种法珀滤光器的控制电路,该电路由数字信号发生器DDS提供电路的驱动信号;本申请无需生成等大反相的驱动信号,仅通过数字信号发生器DDS输出标准正弦数字信号,经模拟滤波驱动电路DAF中的DAC转换为模拟信号并滤波,形成标准正弦模拟信号,利用一路标准正弦模拟信号驱动差分电容电路即可,再利用数字检测电路ADF中的差分ADC直接读出包含法珀滤光器两个平行板的平行度信息的差值电压数字信号,从而彻底避免了对称正弦波难以真正对称的问题,解决了现有F?P电路控制系统时间稳定性差的技术问题。
2024-03-27T09:05:53Z
一种基于多特征融合的太阳耀斑预报方法
邓林华
徐永华
向南彬
蔡云芳
向永源
http://ir.ynao.ac.cn:80/handle/114a53/26355
2023-10-31T00:41:33Z
2023-10-31T00:39:12Z
题名: 一种基于多特征融合的太阳耀斑预报方法
作者: 邓林华; 徐永华; 向南彬; 蔡云芳; 向永源
摘要: 本发明公开了一种基于多特征融合的太阳耀斑预报方法,包括以下步骤:S1:获取一定时间内的太阳观测数据,并从中提取预报因子和耀斑爆发数据,不同预报因子采用a、b、c……标示,不同耀斑爆发数据采用α、β、γ……标示;S2:采用不同预报因子和耀斑爆发数据构建数据集,且每个预报因子均需要与每个耀斑爆发数据进行对应构建,不同数据集采用(a,α)、(a,β)、(a,γ)……标示,再将每个数据集分为训练集和测试集。本发明通过将多种预测因子与计算模型对太阳耀斑的发生进行预测,并通过结果模型对计算模型所得出的结果集进行总结修正,从而能够得出置信度更高的结果,有效地提高了模型对太阳耀斑预报的准确性。
2023-10-31T00:39:12Z
Differential Rotation for Different-sized Sunspot Groups Early Observed by the OGAUC
Wan M(万苗)
Gao PX(高朋鑫)
Zeng, Shu-Guang
Deng LH(邓林华)
http://ir.ynao.ac.cn:80/handle/114a53/26350
2023-11-06T08:37:04Z
2023-10-30T06:20:30Z
题名: Differential Rotation for Different-sized Sunspot Groups Early Observed by the OGAUC
作者: Wan M(万苗); Gao PX(高朋鑫); Zeng, Shu-Guang; Deng LH(邓林华)
摘要: <p>Solar differential rotation is an important ingredient of the solar dynamo model, not only because the solar rotation profile is one of the key inputs in a solar dynamo model, but also because it imposes constraints for the solar dynamo model. In this study, we use the sunspot group catalog published by the Coimbra Astronomical Observatory for the period 1929-1941 to analyze solar rotation profiles of different-sized sunspot groups and the dependence of their annual average of the absolute latitude and annual average rotation rate on the solar cycle. The following main results are obtained: (1) smaller sunspot groups (with an area <100 millionths of the solar hemisphere (msh)) rotate faster than larger ones (with an area >500 msh); (2) different-sized sunspot groups drift toward the equator at different velocities of latitudinal drift, reflecting that they are rooted at different anchoring depths; (3) the rotation rate reaches a maximum during the minimum of the solar cycle, which seems to be independent of the size of sunspot groups. The possible mechanisms for the above results are discussed, and we infer that the differences may be due to the different anchoring depths at which flux tubes of different-sized sunspot groups are rooted, their different ages, and the different ways in which sunspot group coordinates are determined.</p>
2023-10-30T06:20:30Z
An Exposure Meter of Lijiang Fiber-fed High-Resolution Spectrograph
Yu XG(余晓光)
Ji KF(季凯帆)
Zhang XL(张西亮)
Chang L(常亮)
Cai YF(蔡云芳)
Tan Y(覃瑛)
Shang, Zhen-Hong
http://ir.ynao.ac.cn:80/handle/114a53/26349
2023-10-30T09:23:00Z
2023-10-30T06:20:28Z
题名: An Exposure Meter of Lijiang Fiber-fed High-Resolution Spectrograph
作者: Yu XG(余晓光); Ji KF(季凯帆); Zhang XL(张西亮); Chang L(常亮); Cai YF(蔡云芳); Tan Y(覃瑛); Shang, Zhen-Hong
摘要: <p>In 2016, an exposure meter was installed on the Lijiang Fiber-fed High-Resolution Spectrograph to monitor the coupling of starlight to the science fiber during observations. Based on it, we investigated a method to estimate the exposure flux of the CCD in real time by using the counts of the photomultiplier tubes (PMT) of the exposure meter, and developed a piece of software to optimize the control of the exposure time. First, by using flat -field lamp observations, we determined that there is a linear and proportional relationship between the total counts of the PMT and the exposure flux of the CCD. Second, using historical observations of different spectral types, the corresponding relational conversion factors were determined and obtained separately. Third, the method was validated using actual observation data, which showed that all values of the coefficient of determination were greater than 0.92. Finally, software was developed to display the counts of the PMT and the estimated exposure flux of the CCD in real-time during the observation, providing a visual reference for optimizing the exposure time control.</p>
2023-10-30T06:20:28Z
一种基于长短期记忆网络的日冕指数预报方法
邓林华
向南彬
徐永华
向永源
蔡云芳
http://ir.ynao.ac.cn:80/handle/114a53/26329
2023-10-23T03:08:57Z
2023-10-23T02:58:53Z
题名: 一种基于长短期记忆网络的日冕指数预报方法
作者: 邓林华; 向南彬; 徐永华; 向永源; 蔡云芳
摘要: 本发明公开了一种基于长短期记忆网络的日冕指数预报方法,预报方法包括以下步骤:S1、开启日冕指数预报系统,通过系统观测设备对日冕进行观测,根据观测设备实时采集获取图像数据;S2、预设日冕指数预报范围,获取采集图像,通过记忆模型进行对比并判断是否有日冕事件发生,并根据日冕指数预报范围进行分类预报,若有日冕物质抛射事件发生则执行S3;若无日冕物质抛射事件发生,则执行S5;所述记忆模型通过长短期记忆网络进行随时更新;本发明采用基于长短期记忆网络预测模型智能化对日冕指数观测方法能够自动判别日冕图像指数,且自动调节采集参数,获取的数据速度快,提高了准确率。
2023-10-23T02:58:53Z
Periodicity Analysis of the Northern and Southern Hemispheres during 19-23 Solar Cycles Based on Synchrosqueezed Wavelet Transform
Lu, Xuan
Xue, Yajuan
Deng LH(邓林华)
http://ir.ynao.ac.cn:80/handle/114a53/26220
2023-10-07T07:53:11Z
2023-10-07T07:51:23Z
题名: Periodicity Analysis of the Northern and Southern Hemispheres during 19-23 Solar Cycles Based on Synchrosqueezed Wavelet Transform
作者: Lu, Xuan; Xue, Yajuan; Deng LH(邓林华)
摘要: <p>As a high-resolution time-frequency algorithm, the synchrosqueezed wavelet transform (SSWT) is used in this paper to study the well-known periodic variation of the solar surface. The extraction of the solar period signal is performed by studying the cycles of sunspot area and number in the northern and southern hemispheres of the Sun. The solar data were processed using SSWT to extract some well-known periodic signals from solar activity over 19-23 cycles periods by comparison with the complete ensemble empirical mode decomposition (CEEMD). In addition to the ~27-days rotation period and the ~11-years solar period, there are some intermediate periods in the solar data, especially ~170 days (Rieger-Type period) and ~365days (Annual period). Compared with the traditional methods for solar period extraction, SSWT is further used to extract the period signal in solar daily data to improve the accuracy, and the respective advantages and disadvantages of both for solar data processing are demonstrated by comparing with CEEMD. © 2023 IEEE.</p>
2023-10-07T07:51:23Z
Dynamics of Threads Wrapping a Filamentʼs Leg Prior to the Eruption on 2021 October 28
Fang, Yue
Zhang, Jun
Bi Y(毕以)
Song, Zhiping
http://ir.ynao.ac.cn:80/handle/114a53/26216
2023-10-07T07:23:57Z
2023-10-07T06:47:20Z
题名: Dynamics of Threads Wrapping a Filamentʼs Leg Prior to the Eruption on 2021 October 28
作者: Fang, Yue; Zhang, Jun; Bi Y(毕以); Song, Zhiping
摘要: Although the magnetic field structures of solar filaments have been studied for several decades, the detailed evolution of the structure around a filament prior to its eruption is rarely observed. On 2021 October 28 in AR 12887, a major solar flare (X1.0 class) occurred at 15:35 UT. Based on the Solar Dynamics Observatory high-spatial-resolution observations, we find this flare is associated with the eruption of two filaments, namely F1 and F2. The two filaments are initially independent. The western leg (WLEG) of F1 approaches the northern leg of F2, due to the continuous movement and rotation of the magnetic field in which the WLEG roots in. We find first that there are some threads wrapping the WLEG. Brightening and bidirectionally plasmoid flows that originate from a brightening are detected in these threads, then the threads disappear, and the two filaments connect. NLFFF extrapolation reveals that there is a toroidal magnetic structure enveloping the WLEG and corresponding spatially to the threads. It is expected that a filament is enveloped by toroidal magnetic fields. According to the observations and extrapolation, we suggest that these threads represent the toroidal magnetic fields wrapping the WLEG. This paper provides new details about the dynamics of the toroidal magnetic fields. Magnetic reconnection takes place in the toroidal fields and thus destroys the fields, then F1 and F2 connect, and subsequently, the two filaments erupt and the flare occurs.
2023-10-07T06:47:20Z
一种太阳爆发时空关联监测数据采集与可视化呈现方法
邓林华
向永源
向南彬
蔡云芳
陈泽华
张志刚
http://ir.ynao.ac.cn:80/handle/114a53/26214
2023-09-25T05:09:36Z
2023-09-25T03:47:13Z
题名: 一种太阳爆发时空关联监测数据采集与可视化呈现方法
作者: 邓林华; 向永源; 向南彬; 蔡云芳; 陈泽华; 张志刚
摘要: 本发明公开了一种太阳爆发时空关联监测数据采集与可视化呈现方法,该方法包括基于时空关联监测数据采集算法和基于时空关联的可视化呈现算法;基于时空关联监测数据采集算法为时间域采样频率调整算法,并以考虑空间相关性为基础;基于时空关联的可视化呈现算法包括考虑过去监测数据的时空自回归滑动平均模型和预测未来趋势的时空自回归模型,本发明一种太阳爆发时空关联监测数据采集与可视化呈现方法,充分利用了图形图像的形象表达能力,响应了人对色彩和形状的敏锐感知力,使用户更方便有效地观察和分析,这样增强用户对关联规则结果的理解和应用,且对每个模型的参数进行了检验,使得模型的预测趋势更加的精确。
2023-09-25T03:47:13Z
Rotational Characteristics of the Solar Transition Region Using SDO/AIA 304 & ANGS; Images
Wu, Qian-Rui
Zheng, Sheng
Zeng, Shu-Guang
Wan M(万苗)
Zeng, Xiang-Yun
Deng LH(邓林华)
Huang, Yao
http://ir.ynao.ac.cn:80/handle/114a53/26184
2023-09-04T03:23:07Z
2023-09-04T03:13:35Z
题名: Rotational Characteristics of the Solar Transition Region Using SDO/AIA 304 & ANGS; Images
作者: Wu, Qian-Rui; Zheng, Sheng; Zeng, Shu-Guang; Wan M(万苗); Zeng, Xiang-Yun; Deng LH(邓林华); Huang, Yao
摘要: <p>To date, the rotational characteristics of the solar transition region remain unclear. In this work, by applying the flux modulation method to the images derived from the Solar Dynamics Observatory/Atmospheric Imaging Assembly between 2011 and 2022 at 304 & ANGS; wavelength, we have studied the rotation of the solar transition region, and the results obtained are as follows. The solar transition region rotates differentially, while, from the perspective of the entire time interval, the rotation coefficients A and B are 14.39 (& PLUSMN;0.08) and -1.61 (& PLUSMN;0.15), respectively, and we find no prominent asymmetry in the average rotation rate of the northern and southern hemispheres. The solar transition region rotates fastest during the solar cycle maximum, and the average rotation rate follows the overall trend of solar activity. Both the equatorial rotation rate (represented by coefficient A) and the latitudinal gradient (represented by coefficient B) of the solar transition region are smaller than that of the solar chromosphere and the corona, indicating the solar transition region rotates more slowly and more rigidly than the other two layers, and we speculate that the solar chromosphere and corona seem to restrain the rotation of the solar transition region at the same time.</p>
2023-09-04T03:13:35Z
A statistical study of trans-equatorial loops from 2006 to 2020
Yu, Zihan
Chen, Jie
Liu, Jihong
Pevtsov, Alexei A
Hu, Ziyao
Xue ZK(薛志科)
Su, Jiangtao
Deng, Yuanyong
http://ir.ynao.ac.cn:80/handle/114a53/26178
2023-08-28T05:25:08Z
2023-08-28T05:10:50Z
题名: A statistical study of trans-equatorial loops from 2006 to 2020
作者: Yu, Zihan; Chen, Jie; Liu, Jihong; Pevtsov, Alexei A; Hu, Ziyao; Xue ZK(薛志科); Su, Jiangtao; Deng, Yuanyong
摘要: <p>We studied trans-equatorial loops (TLs) statistically from December 2006 to 2020. During this period, 160 TLs were identified, and 12 per cent of all active regions are connected by TLs. The result shows that 74 per cent of TLs are connected to regions of preceding magnetic polarity (PTLs), and only 26 per cent of TLs are connected to regions of following magnetic polarity (FTLs). The dominance of PTLs is related to Joy's law. Moreover, the average length of TLs is 20 & DEG;, and their lengths decrease during the solar cycle. By comparing the number of TLs and the smoothed monthly mean number of sunspots from 2009 to 2018, 88 per cent of the TLs appeared near the solar maximum (2014 & PLUSMN; 2). We noted that the closer a sunspot is to the equator, the easier it is for a TL to form. Furthermore, the tilt angle and latitudinal asymmetry of TL foot-points are independent of the solar cycle.</p>
2023-08-28T05:10:50Z