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Local helioseismology provides a unique opportunity to investigate the subsurface structure and dynamics of active regions and their effect on the large-scale flows and global circulation of the Sun. We use measurements of plasma flows in…

太阳与恒星天体物理 · 物理学 2016-07-19 Alexander G. Kosovichev , Junwei Zhao , Stathis Ilonidis

Large scale solar eruptions significantly impact space weather and damages space-based human infrastructures. It is necessary to predict large scale solar eruptions, which will enable us to protect our vulnerable infrastructures of modern…

太阳与恒星天体物理 · 物理学 2020-07-08 Soumitra Hazra , Gopal Sardar , Partha Choudhuri

A plethora of solar dynamic events, such as the formation of active regions, the emission of jets and the occurrence of eruptions is often associated to the emergence of magnetic flux from the interior of the Sun to the surface and above.…

太阳与恒星天体物理 · 物理学 2019-06-12 V. Archontis , P. Syntelis

The subsurface properties of active regions prior to their appearance at the solar surface may shed light on the process of active region formation. Helioseismic holography has been applied to samples taken from two populations of regions…

太阳与恒星天体物理 · 物理学 2016-08-24 G. Barnes , A. C. Birch , K. D. Leka , D. C. Braun

Image super-resolution has been an important subject in image processing and recognition. Here, we present an attention-aided convolutional neural network (CNN) for solar image super-resolution. Our method, named SolarCNN, aims to enhance…

太阳与恒星天体物理 · 物理学 2024-03-28 Chunhui Xu , Jason T. L. Wang , Haimin Wang , Haodi Jiang , Qin Li , Yasser Abduallah , Yan Xu

We investigate the evolution of subsurface flows during the emergence and the active phase of sunspot regions using the time-distance helioseismology analysis of the full-disk Dopplergrams from the Helioseismic and Magnetic Imager (HMI)…

太阳与恒星天体物理 · 物理学 2024-12-25 Alexander G. Kosovichev , Viacheslav M. Sadykov

Intermittent magnetohydrodynamical turbulence is most likely at work in the magnetized solar atmosphere. As a result, an array of scaling and multi-scaling image-processing techniques can be used to measure the expected self-organization of…

天体物理学 · 物理学 2007-05-23 Manolis K. Georgoulis

Solar flares are intense eruptive events caused by the rapid release of magnetic energy, often impacting Earth's space environment through electromagnetic radiation and high-energy particles. Accurate flare prediction is critical for space…

太阳与恒星天体物理 · 物理学 2026-05-19 Limin Zhao , Xingyao Chen , Xiaoshuai Zhu , Dong Zhao , and Yihua Yan

Early and accurate prediction of solar active region (AR) emergence is crucial for space weather forecasting. Building on established Long Short-Term Memory (LSTM) based approaches for forecasting the continuum intensity decrease associated…

This article implements a Convolutional Neural Network (CNN)-based deep learning model for solar-wind prediction. Images from the Atmospheric Imaging Assembly (AIA) at 193\.A wavelength are used for training. Solar-wind speed is taken from…

太阳与恒星天体物理 · 物理学 2021-09-15 Hemapriya Raju , Saurabh Das

We analyze data from Hinode spacecraft taken over two 54-minute periods during the emergence of AR 11024. We focus on small-scale portions within the observed solar active region and discover the appearance of very distinctive small-scale…

太阳与恒星天体物理 · 物理学 2015-03-13 S. Vargas Dominguez , L. van Driel-Gesztelyi , L. R. Bellot Rubio , .

Solar active regions (ARs) that produce strong flares and coronal mass ejections (CMEs) are known to have a relatively high non-potentiality and are characterized by delta-sunspots and sheared magnetic structures. In this study, we conduct…

太阳与恒星天体物理 · 物理学 2017-11-29 Shin Toriumi , Shinsuke Takasao

In this review many of the well known tools for the analysis of Complex systems are used in order to study the global coupling of the turbulent convection zone with the solar atmosphere where the magnetic energy is dissipated explosively.…

太阳与恒星天体物理 · 物理学 2016-11-03 Loukas Vlahos , Heinz Isliker

Magnetic fields play a crucial role in various astrophysical processes within the intracluster medium, including heat conduction, cosmic ray acceleration, and the generation of synchrotron radiation. However, measuring magnetic field…

星系天体物理 · 物理学 2025-07-02 Jiyao Zhang , Yue Hu , A. Lazarian

Aims. Solar active regions (ARs), which are formed by flux emergence, serve as the primary sources of solar eruptions. However, the specific physical mechanism that governs the emergence process and its relationship with flare productivity…

太阳与恒星天体物理 · 物理学 2024-03-28 Zheng Sun , Ting Li , Quan Wang , Shangbin Yang , Mei Zhang , Yajie Chen

In order to efficiently analyse the vast amount of data generated by solar space missions and ground-base instruments, modern machine learning techniques such as decision trees, support vector machines (SVMs) and neural networks can be very…

太阳与恒星天体物理 · 物理学 2020-05-28 Teri Love , Thomas Neukirch , Clare E. Parnell

Magnetic flux ropes (FRs) are twisted structures appearing on the sun, predominantly in the magnetically concentrated regions. These structures appear as coronal features known as filaments or prominences in H$\alpha$ observations, and as…

太阳与恒星天体物理 · 物理学 2024-10-04 P. Vemareddy

Facial expressions play a significant role in human communication and behavior. Psychologists have long studied the relationship between facial expressions and emotions. Paul Ekman et al., devised the Facial Action Coding System (FACS) to…

计算机视觉与模式识别 · 计算机科学 2017-05-11 Ran Breuer , Ron Kimmel

State-of-the-art solar instrumentation is revealing magnetic activity of the Sun with unprecedented resolution. Observations with the 1.6m New Solar Telescope of the Big Bear Solar Observatory are making next steps in our understanding of…

太阳与恒星天体物理 · 物理学 2015-06-19 Santiago Vargas Dominguez , Alexander Kosovichev , Vasyl Yurchyshyn

Solar Energetic Particle events (SEPs) are among the most dangerous transient phenomena of solar activity. As hazardous radiation, SEPs may affect the health of astronauts in outer space and adversely impact current and future space…