Astrophysics and Space Science最新文献

Non-Gaussian distributions in solar wind plasma: data analysis and source 太阳风等离子体的非高斯分布：数据分析和来源

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-09-25 DOI: 10.1007/s10509-025-04493-w

Asif Shah

引用次数: 0

Geo-effectiveness of ICMES/MCs of different magnetic-polarity configurations 不同磁极性配置的ICMES/ mc的地球有效性

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-09-25 DOI: 10.1007/s10509-025-04487-8

W. Alotaibi, B. Badruddin, M. Derouich

{"title":"Geo-effectiveness of ICMES/MCs of different magnetic-polarity configurations","authors":"W. Alotaibi, B. Badruddin, M. Derouich","doi":"10.1007/s10509-025-04487-8","DOIUrl":"10.1007/s10509-025-04487-8","url":null,"abstract":"<div>This research investigates the geoeffectiveness of interplanetary magnetic field configurations by analyzing 203 geomagnetic storm events recorded between 1995 and 2015. The study systematically categorizes events into five intensity levels: quiet, weak, moderate, intense, and severe, to evaluate how different polarity configurations and flux rope configurations influence geomagnetic activity. Utilizing an extensive methodology, we employed correlation analysis and superposed epoch analysis on 17 parameters extracted from OMNI/NASA hourly datasets. The investigation focused on identifying how specific magnetic configurations impact geomagnetic storm characteristics, with special attention to the Disturbance Storm-Time Index (Dst). The findings reveal nuanced variations in geoeffectiveness across magnetic configurations. Configurations were stratified into two primary groups, with Group 1 (S, SN, SNN, SNS) demonstrating notably higher geomagnetic responsiveness. Notably, the SNS configuration emerged as the most geoeffective, accounting for 37% of intense storms and exhibiting an extended main phase lasting 48 hours. Conversely, Group 2 configurations (N, NS, NSS, NSN) generally displayed reduced geoeffectiveness, contributing to 30% of quiet storms and merely 3% of severe storms. However, the NSS configuration presented an intriguing anomaly, characterized by the lowest negative Dst value and an unprecedented 96-hour recovery phase, attributed to its distinctive two-step main phase storm. Flux rope configurations also demonstrated differential impacts, with the (F^{+}) rotation being particularly geoeffective, contributing to 11% of severe storms. We further uncovered a remarkably strong correlation between the dawn-dusk electric field (Ey) and (Dst_{min}) in the NSS configuration, registering a correlation coefficient of -0.95.</div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"370 9","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The continuation of triple collision orbits for the three-body system with unequal masses 等质量三体系三碰撞轨道的延拓

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-09-23 DOI: 10.1007/s10509-025-04488-7

Xiaoming Li, Zhe Dong, Xiaochen Li, Linghui He

引用次数: 0

On the analysis of eruptive events with non-radial evolution 非径向演化的喷发事件分析

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-09-23 DOI: 10.1007/s10509-025-04491-y

Abril Sahade, M. Valeria Sieyra, Mariana Cécere

引用次数: 0

Reflections on the upper Hertzsprung-Russell Diagram 关于赫茨普龙-罗素图上端的思考

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-09-23 DOI: 10.1007/s10509-025-04492-x

Roberta M. Humphreys, Kris Davidson

引用次数: 0

Solar flare forecasting based on swin transformer and temporal convolutional networks 基于swin变压器和时间卷积网络的太阳耀斑预测

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-09-22 DOI: 10.1007/s10509-025-04485-w

Yuanyuan Zhang, Bo Liang, Song Feng, Wei Dai, Shoulin Wei

{"title":"Solar flare forecasting based on swin transformer and temporal convolutional networks","authors":"Yuanyuan Zhang, Bo Liang, Song Feng, Wei Dai, Shoulin Wei","doi":"10.1007/s10509-025-04485-w","DOIUrl":"10.1007/s10509-025-04485-w","url":null,"abstract":"<div>Solar flares, intense solar eruptions, discharge electromagnetic radiation and energetic particles that may have major consequences for both space weather and Earth’s atmospheric conditions. Therefore, developing high-precision forecasting models is crucial. In this paper, we propose a solar flare prediction model, which integrates the Swin Transformer with a TCN augmented by a global attention mechanism, named SwinTCN-Att, for predicting whether ≥C- and ≥M-class flare events will erupt in the solar active regions (ARs) in the next 24 hours. We collected magnetogram data from solar ARs obtained from the Space Weather Helioseismic and Magnetic Imager Active Region Patch (SHARP) dataset, spanning from May 2010 to December 2019, and selected 16 magnetic field feature parameters from the SHARP data. The construction of the model is carried out in two stages: first, the spatial characteristics of the magnetogram are captured using the Swin Transformer; next, these spatial features are integrated with 16 magnetic field parameters. Temporal features are then derived using TCN with a global attention mechanism to predict solar flares. Then, following model training and testing, we evaluated performance using five different assessment metrics, with the True Skill Statistic (TSS) serving as the primary evaluation metric. The results show that the TSS scores achieved were 0.825 ± 0.042 for ≥C-class flares and 0.879 ± 0.025 for ≥M-class flares, marking a significant improvement over previous models. These results demonstrate that the proposed SwinTCN-Att model effectively integrates relevant solar flare information, combines the strengths of both individual models, and captures solar flare evolution features, achieving superior predictive performance.</div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"370 9","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of ionospheric bottomside profile parameters (B0 & B1) from FORMOSAT-7/COSMIC-2 radio occultation profiles with Digisonde and IRI-2020 model 来自FORMOSAT-7/COSMIC-2射电掩星剖面的电离层底部剖面参数（B0 & B1）与Digisonde和IRI-2020模型的比较

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-09-22 DOI: 10.1007/s10509-025-04490-z

Iswariya S, Sampad Kumar Panda, Haris Haralambous, Mefe Moses, Krishnendu Sekhar Paul, Daniel Okoh

{"title":"Comparison of ionospheric bottomside profile parameters (B0 & B1) from FORMOSAT-7/COSMIC-2 radio occultation profiles with Digisonde and IRI-2020 model","authors":"Iswariya S, Sampad Kumar Panda, Haris Haralambous, Mefe Moses, Krishnendu Sekhar Paul, Daniel Okoh","doi":"10.1007/s10509-025-04490-z","DOIUrl":"10.1007/s10509-025-04490-z","url":null,"abstract":"<div>In this paper, we present a comprehensive validation of bottomside electron density profile (EDP) thickness (B0) and shape (B1) parameters derived through least-square fitting of FORMOSAT-7/COSMIC-2 radio occultations with the coincident-colocated Digisonde EDPs at 24 locations spanning equatorial, low-, and mid-latitude regions and the default bottomside modeling option in the latest edition of the International Reference Ionosphere model (IRI-2020). These parameters are essential descriptors of the ionospheric bottomside morphology, which are critical for characterizing the vertical structure of the ionosphere and are influenced by solar flux, geomagnetic activity, and space weather dynamics. Leveraging a large dataset from COSMIC-2, we employed rigorous quality constraints through visual inspections and defined exclusion criteria to identify the most representative profiles for investigating the diurnal, seasonal, and longitudinal variations of the parameters as a function of local time during the period from 2020 to 2022, corresponding to the ascending phase of solar cycle 25. The results demonstrate that COSMIC-2 derived B0 and B1 parameters have better agreement with Digisonde observations than those predicted by IRI-2020, highlighting the significance of COSMIC-2 profile parameters towards improvement in empirical ionosphere models.</div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"370 9","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effective cross sections and rates coefficients derived from collision-induced rotational excitation of HCl(^{+}(X^{2}Pi )) with He((^{1}S)): isotopic effects HCl (^{+}(X^{2}Pi ))与He（(^{1}S)）碰撞诱导旋转激发的有效截面和速率系数：同位素效应

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-09-18 DOI: 10.1007/s10509-025-04484-x

Joseph Ngueleo Baldagui, Théophile Tchakoua, Jean Jules Fifen, Mama Nsangou

{"title":"Effective cross sections and rates coefficients derived from collision-induced rotational excitation of HCl(^{+}(X^{2}Pi )) with He((^{1}S)): isotopic effects","authors":"Joseph Ngueleo Baldagui, Théophile Tchakoua, Jean Jules Fifen, Mama Nsangou","doi":"10.1007/s10509-025-04484-x","DOIUrl":"10.1007/s10509-025-04484-x","url":null,"abstract":"<div>In this work, we studied the helium-induced collisional excitation of the radical ion HCl+. Our work focuses on calculating two-dimensional potential energy surfaces (PES) to study the interaction due to the collision between HCl+ and He, and on analyzing the influence of the isotopic effect on cross sections and collision rates. For Ab initio calculations of PES (^{2}A^{prime }) and (^{2}A^{prime prime }) of HCl+(X(^{2}Pi ))-He complex, we used the RCCSD(T)-F12 method with cc-pVQZ-F12 basis sets. These surfaces have been fitted using the Reproducing Kernel Hilbert Space (RKHS) method and were submitted to the close-coupling approach in order to work out the inelastic integral cross sections. Collision cross sections taking into account the fine structures of HCl+ have been performed for kinetic energies up to 3500 cm−1 and the thermal excitation rates for kinetic temperatures varying from (4K) up to 400 K. It appears that the difference in the cross section and collisional rate cofficients for the H35Cl+ and H37Cl+ colliding with He was found to be negligeable. In contrast, a significant difference in effective cross-sections and collision rates between HCl+-He and DCl+-He was observed to the extent that it is impossible to make estimation of collision rates of deuterated species from those of the hydrogenated species.</div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"370 9","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145078806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Diffusion spectra of ultrarelativistic unevenly moving shell radiation 超相对论性不均匀运动壳层辐射的扩散谱

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-09-18 DOI: 10.1007/s10509-025-04489-6

Aksana E. Kurhuzava

引用次数: 0

On the modeling and exploitation of co-orbital dynamics 共轨道动力学的建模与开发

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-09-16 DOI: 10.1007/s10509-025-04486-9

Elisa Maria Alessi, Maria Helena Moreira Morais

引用次数: 0