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• 期刊论文 [15]
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浏览/检索结果: 共17条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 Detection of Flare Multiperiodic Pulsations in Mid-ultraviolet Balmer Continuum, Lyl Hard X-Ray, and Radio Emissions Simultaneously 期刊论文  OAI收割 The Astrophysical Journal, 2021, 卷号: 921, 页码: 179 作者:  HXMT   |  收藏  |  浏览/下载：28/0  |  提交时间：2022/02/08 Solar flares  Solar oscillations  Solar ultraviolet emission  Solar  x-ray emission  Solar radio emission  1496  1515  1533  1536  1522  Astrophysics - Solar and Stellar Astrophysics  Abstract: Quasi-periodic pulsations (QPPs), which usually appear as temporal pulsations of the total flux, are frequently detected in the light curves of solar/stellar flares. In this study, we present the investigation of nonstationary QPPs with multiple periods during the impulsive phase of a powerful flare on 2017 September 6, which were simultaneously measured by the Hard X-ray Modulation Telescope (Insight-HXMT), as well as the ground-based BLENSW. The multiple periods, detected by applying a wavelet transform and Lomb-Scargle periodogram to the detrended light curves, are found to be ~20-55 s in the Ly`and mid-ultraviolet Balmer continuum emissions during the flare impulsive phase. Similar QPPs with multiple periods are also found in the hard X-ray emission and low-frequency radio emission. Our observations suggest that the flare QPPs could be related to nonthermal electrons accelerated by the repeated energy release process, i.e., triggering of repetitive magnetic reconnection, while the multiple periods might be modulated by the sausage oscillation of hot plasma loops. For the multiperiodic pulsations, other generation mechanisms could not be completely ruled out.   Multi-Time Scale Analysis of Runoff at the Yangtze Estuary Based on the Morlet Wavelet Transform Method 期刊论文  OAI收割 Journal of Mountain Science, 2014, 卷号: 11, 期号: 6, 页码: 1499-1506 KUANG Cui-ping; SU Ping; GU Jie; CHEN Wu-jun; ZHANG Jian-le; ZHANG Wan-lei; ZHANG Yong-feng 收藏  |  浏览/下载：55/0  |  提交时间：2014/11/18 Datong station  Wavelet transform  Runoff series  Periodic characteristics   Broad-Band Spectral Indices Variability of BL Lacertae by Wavelet Method 期刊论文  OAI收割 JOURNAL OF ASTROPHYSICS AND ASTRONOMY, 2014, 卷号: 35, 期号: 3, 页码: 489-493 作者:  Zhang HJ(张皓晶);  Bai JM(白金明);  Bao, YY;  Zhang, X 收藏  |  浏览/下载：24/0  |  提交时间：2016/04/08 Galaxies: BL Lacertae objects  individual: BL Lacertae: broad-band spectral indices  periodic variation  methods: numerical: wavelet analysis   Periodic Identification of Astronomical Time Series with Empirical Mode Decomposition and Wavelet Transform Analysis 会议论文  OAI收割 6th International Conference on Intelligent Networks and Intelligent Systems (ICINIS), Shenyang, PEOPLES R CHINA, 2013-11-01 作者:  Deng LH(邓林华);  Li, Z 收藏  |  浏览/下载：16/0  |  提交时间：2016/04/06 information processing  periodic identification  empirical mode decomposition  wavelet transform analysis   Possible effect of ENSO on annual sediment discharge of debris flows in the Jiangjia Ravine based on Morlet wavelet transforms 期刊论文  OAI收割 INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH, 2008, 卷号: 23, 期号: 3, 页码: 267-274 作者:  Zhang, J. H.;  Wei, F. Q.;  Liu, S. Z.;  Gao, C. 收藏  |  浏览/下载：26/0  |  提交时间：2013/03/14 Debris flow  ENSO  Wavelet transform  Periodic variation   Temporal and spatial characteristics of wet-dry climate variation in the northern slope of Tianshan Mountains, Xinjiang 会议论文  OAI收割 Proceedings of SPIE - The International Society for Optical Engineering, Guangzhou, China, 2008 Yu; Meiyan1; 2; Chenxi; C.1; Bao; Anming1 收藏  |  浏览/下载：21/0  |  提交时间：2011/08/23 Geographic information systems - Landforms - Time series - Wavelet analysis - Wavelet transforms - Abrupt changes - Climate variation - Correlation analysis - Desert areas - Different time scale - Enso - Influence degrees - Mexican hat wavelets - Multi-time scale - Northern slope of tianshan mountains - Periodic oscillations - Rainfall datum - Regional characteristics - Research results - Temporal and spatial characteristics - Xinjiang   Periodic wavelet frames 期刊论文  OAI收割 ADVANCES IN COMPUTATIONAL MATHEMATICS, 2005, 卷号: 22, 期号: 2, 页码: 165-180 作者:  Zhang, ZH   |  收藏  |  浏览/下载：19/0  |  提交时间：2018/07/30 periodic wavelet frames  a dual pair of frames  optimal frame bounds   Localization of dual periodic scaling and wavelet functions 期刊论文  OAI收割 ADVANCES IN COMPUTATIONAL MATHEMATICS, 2003, 卷号: 19, 期号: 1-3, 页码: 195-210 作者:  Chen, HL;  Peng, SL   |  收藏  |  浏览/下载：14/0  |  提交时间：2018/07/30 localization  dual function  periodic wavelet   A statistical analysis of the amplitude and phase of earth polar shift in time-frequency domain 期刊论文  OAI收割 CHINESE ASTRONOMY AND ASTROPHYSICS, 2001, 卷号: 25, 期号: 3, 页码: 364-370 作者:  Ke, XZ;  Li, XH;  Deng, FL   |  收藏  |  浏览/下载：12/0  |  提交时间：2021/11/29 wavelet analysis  polar shift  statistic analysis  periodic variation   Solving integral equations with logarithmic kernel by using periodic quasi-wavelet 期刊论文  OAI收割 JOURNAL OF COMPUTATIONAL MATHEMATICS, 2000, 卷号: 18, 期号: 5, 页码: 487-512 作者:  Chen, HL;  Peng, SL   |  收藏  |  浏览/下载：22/0  |  提交时间：2018/07/30 periodic quasi-wavelet  integral equation  multiscale