Journal of Astrophysics and Astronomy最新文献

Comparative study between the effect of Kelbg and Coulomb interaction on the broadening by the electrons collision of the Mg II spectral line shape in plasmas Kelbg和Coulomb相互作用对等离子体中mgii谱线形状电子碰撞展宽影响的比较研究

IF 1.5 4区物理与天体物理

Journal of Astrophysics and Astronomy Pub Date : 2026-10-31 DOI: 10.1007/s12036-026-10200-0

Y BEN NANA, M BENAIDA, M T MEFTAH

引用次数: 0

HEL1OS on Aditya-L1 Mission: Operations, data processing and monitoring of Sun in Hard X-rays Aditya-L1任务上的HEL1OS：太阳硬x射线的操作、数据处理和监测

IF 1.5 4区物理与天体物理

Journal of Astrophysics and Astronomy Pub Date : 2026-10-24 DOI: 10.1007/s12036-026-10196-7

B. T. Ravishankar, Manju Sudhakar, Srikar Paavan Tadepalli, Kiran Kumar Kalisetti, Madhavan R. Menon, Anand Jain, Reenu Palawat, Brajpal Singh, T. Rethika, Priyanka Upadhyay, Prapti Mittal, Amit Purohit, M. Srikanth, Anuj Nandi

{"title":"HEL1OS on Aditya-L1 Mission: Operations, data processing and monitoring of Sun in Hard X-rays","authors":"B. T. Ravishankar, Manju Sudhakar, Srikar Paavan Tadepalli, Kiran Kumar Kalisetti, Madhavan R. Menon, Anand Jain, Reenu Palawat, Brajpal Singh, T. Rethika, Priyanka Upadhyay, Prapti Mittal, Amit Purohit, M. Srikanth, Anuj Nandi","doi":"10.1007/s12036-026-10196-7","DOIUrl":"10.1007/s12036-026-10196-7","url":null,"abstract":"<div>HEL1OS (High Energy L1 Orbiting X-ray Spectrometer) is the hard X-ray spectrometer on-board Aditya-L1 solar mission, monitoring the Sun continuously in the hard X-ray band of 8 keV to 150 keV from the vantage observation platform around the Sun-Earth Lagrangian Point 1 (L1). HEL1OS was commissioned in end of October, 2023 and the final instrument configuration was set by end of June, 2024 after all the performance verifications. The instrument always operates in the event mode, and the down-linked data is processed in an automated pipeline to generate Science-ready products comprising mainly of solar spectra in 8 keV to 150 keV energy band. The data products of observations since December, 2023 are hosted on the internet with open access. This includes data from the performance verification phase of the payload operations. In this paper, the details of the commissioning and performance verification phases, all the stages of the fully automated data pipeline, and the data products of HEL1OS are discussed. Also a few scientific results are discussed to illustrate the timing and spectral capabilities of the instrument in monitoring Sun in the X-ray energy bands.</div>","PeriodicalId":610,"journal":{"name":"Journal of Astrophysics and Astronomy","volume":"47 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149235100","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

LensFactory.jl: a general-purpose strong lens modeling package LensFactory。Jl：一个通用的强镜头建模包

IF 1.5 4区物理与天体物理

Journal of Astrophysics and Astronomy Pub Date : 2026-10-24 DOI: 10.1007/s12036-026-10197-6

Ashish Kumar Meena

{"title":"LensFactory.jl: a general-purpose strong lens modeling package","authors":"Ashish Kumar Meena","doi":"10.1007/s12036-026-10197-6","DOIUrl":"10.1007/s12036-026-10197-6","url":null,"abstract":"<div>We present LensFactory.jl, an efficient, open-source, general-purpose strong lens modeling package written in Julia. It supports single- and multi-plane lensing with a wide range of analytic lens profiles, and its modular design, built on Julia’s multiple dispatch, makes it straightforward to add new profiles or inference methods, while native multi-threading parallelizes the computationally expensive steps, enabling full cluster-scale lens reconstructions within hours on a desktop-class machine. We validate the mass-reconstruction pipeline of LensFactory.jl on two simulated galaxy clusters (Ares and Hera), recovering the convergence and magnification maps well where the lensing constraints lie, and on the JWST-observed cluster SMACS J0723.3–7327, obtaining a strong lens model (image-plane RMS of (0.46'')) consistent with previously published results. In addition, we introduce singularity maps as a complementary diagnostic for comparing lens models, probing differences in the higher-order derivatives of the lensing potential, which remain largely unconstrained by standard observables such as image positions, time delays, and flux ratios. LensFactory.jl is accompanied by a set of worked examples covering all core functionality.</div>","PeriodicalId":610,"journal":{"name":"Journal of Astrophysics and Astronomy","volume":"47 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149235037","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

Mineralogical analysis of Vigarano group NWA 5508 carbonaceous chondrite by SEM-EDS, micro-Raman, and FTIR spectroscopy Vigarano组NWA 5508碳质球粒陨石的SEM-EDS、微拉曼和FTIR分析

IF 1.5 4区物理与天体物理

Journal of Astrophysics and Astronomy Pub Date : 2026-10-22 DOI: 10.1007/s12036-026-10188-7

CEREN KAMIL, OZAN UNSALAN, CISEM ALTUNAYAR-UNSALAN, MICHAEL ZOLENSKY

{"title":"Mineralogical analysis of Vigarano group NWA 5508 carbonaceous chondrite by SEM-EDS, micro-Raman, and FTIR spectroscopy","authors":"CEREN KAMIL, OZAN UNSALAN, CISEM ALTUNAYAR-UNSALAN, MICHAEL ZOLENSKY","doi":"10.1007/s12036-026-10188-7","DOIUrl":"10.1007/s12036-026-10188-7","url":null,"abstract":"<div>NWA 5508 was characterized by SEM-EDS, micro-Raman, and infrared (IR) reflectance spectroscopy. SEM-EDS analysis identified Mg, Si, and Fe as the predominant elements, with Ca, Al, and S occurring as secondary constituents, indicative of heterogeneous Ca–Al-rich inclusions (CAIs) embedded within the matrix. Raman analyses identified olivine (Fo10-Fo100), kirschsteinite, enstatite (En90-En98), and hedenbergite, indicating both high-temperature nebular condensates and Fe-Ca-rich phases from oxidizing parent body processes. Magnetite is likely indigenous, while hematite, goethite, and Ca-sulfates are attributed to terrestrial alteration. IR spectroscopy confirmed primary silicates (olivine, pyroxene, and anorthite), refractory phases (diopside, melilite, spinel, and nepheline), carbonates, phyllosilicates, and organics. The combined data provides evidence for a complex geochemical history involving high-temperature nebular condensation, parent body metamorphism, aqueous alteration, and post-fall terrestrial processes. These results would contribute to the broader understanding of mineralogical diversity, alteration history, and formation conditions of CV3 chondrites, offering insights into the early solar system and parent body evolution.</div>","PeriodicalId":610,"journal":{"name":"Journal of Astrophysics and Astronomy","volume":"47 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149235120","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

Local time and longitudinal variability of ionospheric response during extreme geomagnetic events 极端地磁事件期间电离层响应的地方时和纵向变率

IF 1.5 4区物理与天体物理

Journal of Astrophysics and Astronomy Pub Date : 2026-10-14 DOI: 10.1007/s12036-026-10187-8

CHUKWUMA MOSES ANORUO, ONYINYE G. NWANKWO

{"title":"Local time and longitudinal variability of ionospheric response during extreme geomagnetic events","authors":"CHUKWUMA MOSES ANORUO, ONYINYE G. NWANKWO","doi":"10.1007/s12036-026-10187-8","DOIUrl":"10.1007/s12036-026-10187-8","url":null,"abstract":"<div>We analyzed Total Electron Content (TEC) data from 22 GNSS (Global Navigation Satellite System) stations across Africa, Europe, and Asia, spanning equatorial, low, and mid-latitudes, to characterize daytime and nighttime ionospheric storm responses during the geomagnetic events of February 2014 and March 2015. Using a 5-min interval TEC dataset, we employed the threshold |rTEC ≤−30| or |rTEC ≥ 30| to identify positive and negative storm phases relative to a quiet-time defined by the median of the 10 quietest days. To investigate the underlying drivers of these phases, we examined variations in the ΔH-component from collocated magnetometers and evaluated spatial gradients to assess local time evolution and longitudinal variability. Our results show that ionospheric electrodynamics during storms are more strongly controlled by local time and geomagnetic longitude than by storm intensity, although storm strength still modulates the magnitude and spatial extent of the response. Notably, 18.97% of positive phases occur during the daytime compared to 10.94% at night, underscoring the critical role of local time in modulating TEC variability.</div>","PeriodicalId":610,"journal":{"name":"Journal of Astrophysics and Astronomy","volume":"47 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189262","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

Observations of the 21 cm Hi line from the milky way galaxy using pyramidal horn radio telescope 用金字塔角射电望远镜观测银河系21厘米Hi线

IF 1.5 4区物理与天体物理

Journal of Astrophysics and Astronomy Pub Date : 2026-10-13 DOI: 10.1007/s12036-026-10198-5

Kaustav Bhattacharjee, Himanshu Grover, P Arumugam

引用次数: 0

Energetic particle acceleration and transport: Interplanetary coronal mass ejections and shocks 高能粒子加速和传输：行星际日冕物质抛射和冲击

IF 1.5 4区物理与天体物理

Journal of Astrophysics and Astronomy Pub Date : 2026-10-13 DOI: 10.1007/s12036-026-10186-9

Olga E. Malandraki, Christina M. S. Cohen, Joe Giacalone, Leng Ying Khoo, Domenico Trotta, Laura Rodríguez-García, Athanasios Kouloumvakos, Zheyi Ding, Yuncong Li, Alexander Kollhoff, John G. Mitchell, David J. Mccomas, Nathan A. Schwadron, Javier Rodríguez-Pacheco, Robert F. Wimmer-Schweingruber, George C. Ho, Glenn Mason, Michalis Karavolos, Jingnan Guo

{"title":"Energetic particle acceleration and transport: Interplanetary coronal mass ejections and shocks","authors":"Olga E. Malandraki, Christina M. S. Cohen, Joe Giacalone, Leng Ying Khoo, Domenico Trotta, Laura Rodríguez-García, Athanasios Kouloumvakos, Zheyi Ding, Yuncong Li, Alexander Kollhoff, John G. Mitchell, David J. Mccomas, Nathan A. Schwadron, Javier Rodríguez-Pacheco, Robert F. Wimmer-Schweingruber, George C. Ho, Glenn Mason, Michalis Karavolos, Jingnan Guo","doi":"10.1007/s12036-026-10186-9","DOIUrl":"10.1007/s12036-026-10186-9","url":null,"abstract":"<div>Solar Energetic Particles from suprathermal (few keV) up to relativistic (few GeV) energies constitute an important contributor to the characterization of the space environment. Emitted from the Sun they are associated with solar flares and shock waves driven by Coronal Mass Ejections. This review presents important recent results of the study of Interplanetary CMEs and shocks in relation to energetic particle acceleration and transport, taking advantage of multi-point, multi-instrument observations available by a fleet of spacecraft in the heliosphere. In particular, the Solar Orbiter and Parker Solar Probe pioneering missions providing unprecedented measurements of energetic particles in the near-Sun environment offer promising insights into several unresolved questions particularly regarding the mechanisms responsible for the acceleration and transport of energetic particles in the heliosphere and their relative contributions.</div>","PeriodicalId":610,"journal":{"name":"Journal of Astrophysics and Astronomy","volume":"47 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189207","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

Anomalous scattering of pulsars towards the Gum Nebula 脉冲星对树胶星云的反常散射

IF 1.5 4区物理与天体物理

Journal of Astrophysics and Astronomy Pub Date : 2026-10-13 DOI: 10.1007/s12036-026-10189-6

M. A. Krishnakumar, Bhal Chandra Joshi, P K Manoharan

引用次数: 0

Generalized Fluctuation Theory of Galaxy Clustering With Continuous Mass Spectra 具有连续质谱的星系群集的广义涨落理论

IF 1.5 4区物理与天体物理

Journal of Astrophysics and Astronomy Pub Date : 2026-09-30 DOI: 10.1007/s12036-026-10192-x

M. S. Khan, Owais Farooq, Raja Nisar Ali

{"title":"Generalized Fluctuation Theory of Galaxy Clustering With Continuous Mass Spectra","authors":"M. S. Khan, Owais Farooq, Raja Nisar Ali","doi":"10.1007/s12036-026-10192-x","DOIUrl":"10.1007/s12036-026-10192-x","url":null,"abstract":"<div>We develop a continuum counts-in-cells fluctuation theory for gravitational clustering in galaxy populations described by a continuous comoving mass function (phi (m,z)) within the quasi-equilibrium grand-canonical framework. Starting from the equal-mass and two-species fluctuation sectors, we construct a finite-resolution mass-bin representation, pass to the continuum limit and derive closed expressions for the internal energy, the pressure, and the first four count cumulants in the strict total-count sector. The latter is then rewritten in an intrinsic normalization based on the mean mass (bar{m} = M_1/M_0), so that the observable hierarchy depends only on the mass function, the clustering parameter, and the thermodynamic control variables. The continuum construction recovers the equal-mass formulas exactly and reproduces the discrete two-species relations in the corresponding singular limit. In the weak-clustering regime, the leading spectral corrections are controlled by the moments (M_3), (M_6), and (M_9). Within the strict total-count criticality condition, the compressibility denominator is pinned to (D_c=1/2), so the Fano factor takes the fixed value (F_c=2) as an algebraic identity that follows directly from the criticality condition, whereas the higher reduced cumulants preserve explicit dependence on the mass spectrum through the response hierarchy (A_r). A truncated Schechter specialization for threshold-selected catalogs then makes the physical content explicit: raising the lower mass threshold lowers the critical clustering parameter while increasing the variance-, skewness-, and kurtosis-level responses of the counts-in-cells distribution. The resulting framework furnishes an analytical interface between quasi-equilibrium gravitational clustering theory and finite-resolution mass-selected one-point observables for realistic galaxy populations.</div>","PeriodicalId":610,"journal":{"name":"Journal of Astrophysics and Astronomy","volume":"47 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149133266","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

Metallicity dependence of the M-dwarf flare-frequency-distribution slope at fixed mass-based Rossby number across the fully-convective transition 全对流跃迁中固定质量罗斯比数下m -矮耀斑频率分布斜率的金属丰度依赖性

IF 1.5 4区物理与天体物理

Journal of Astrophysics and Astronomy Pub Date : 2026-09-28 DOI: 10.1007/s12036-026-10191-y

Edison Yang

{"title":"Metallicity dependence of the M-dwarf flare-frequency-distribution slope at fixed mass-based Rossby number across the fully-convective transition","authors":"Edison Yang","doi":"10.1007/s12036-026-10191-y","DOIUrl":"10.1007/s12036-026-10191-y","url":null,"abstract":"<div>We measure the cumulative flare-frequency-distribution slope (alpha ) as a function of metallicity at fixed mass-based Rossby number across the M3.5/M4 fully-convective transition. From 19,099 SDSS-V DR19 BOSS M dwarfs cross-matched with TESS light curves, we detect flares with a convolutional-neural-network ensemble and fit per-cell (alpha ) with a doubly-truncated Pareto. In fully-convective M dwarfs ((M_star le 0.35) M(_odot ), (0.13 le textrm{Ro} < 0.45)), (alpha ) increases with metallicity. The robust result is the sign of this ordering: (alpha ) is higher in the metal-rich bin by (Delta alpha = +0.23), independent of the bin centres. A star-level bootstrap is positive in 99.4% of resamples (about (2.5sigma ); the (95%) interval excludes zero), and an independent mass-perturbation Monte Carlo in 94% ((1.6sigma )). The magnitude is systematic-dominated: we adopt the mass-marginalised (+0.13^{+0.07}_{-0.08}) dex(^{-1}) (the fixed-boundary (+0.26 pm 0.03) is statistical only), and a physical per-dex value awaits better metallicities. The ordering falls to zero as the boundary is raised into the transition zone, which we cannot yet attribute to physics or sample definition.</div>","PeriodicalId":610,"journal":{"name":"Journal of Astrophysics and Astronomy","volume":"47 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149133106","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