130 citations · 492 across the 24 of their papers we have counts for
27 papers · 1 filter
Review of Machine Learning Models for Solar Energetic Particle Prediction
Spiridon Kasapis, Pouya Hosseinzadeh, Kathryn Whitman +73
Solar energetic particle (SEP) events have attracted increasing attention due to their significant radiation hazards for aviation, spacecraft electronics, and human missions beyond…
SolARED: Solar Active Region Emergence Dataset for Machine Learning Aided Predictions
Spiridon Kasapis, Eren Dogan, Irina N. Kitiashvili +6
The development of accurate forecasts of solar eruptive activity has become increasingly important for preventing potential impacts on space technologies and exploration. Therefore…
Forecasting Continuum Intensity for Solar Active Region Emergence Prediction using Transformers
Jonas Tirona, Sarang Patil, Spiridon Kasapis +5
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…
Helioseismic Evidence That the Solar Dynamo Originates near the Tachocline
Krishnendu Mandal, Alexander G. Kosovichev
The exact location of the solar dynamo remains uncertain--whether it operates primarily in the near-surface shear layer, throughout the entire convection zone, or near the tachocli…
3D Radiative MHD Modeling of Particle Beam Heating of the Solar Atmosphere
Samuel Granovsky, Alexander G. Kosovichev, Irina N. Kitiashvili +1
While solar flares are primarily associated with enhanced ultraviolet and X-ray emission, a subset of flares exhibit significant continuum brightening in visible light and are clas…
Activity-Cycle Variations of Convection Scales in Subsurface Layers of the Sun
Alexander V. Getling, Alexander G. Kosovichev
We use subsurface-flow velocity maps inferred by time--distance helioseismology from Doppler measurements with the Helioseismic and Magnetic Imager (HMI) of the Solar Dynamics Obse…
Helicity Fluxes and Hemispheric Helicity Rule of Active Regions Emerging from the Convection Zone Dynamo
V. V. Pipin, Shangbin Yang, A. G. Kosovichev
Using a 3D non-linear mean-field solar dynamo model, we investigate the magnetic helicity flux and magnetic twist, and tilt parameters of bipolar magnetic regions (BMRs) emerging f…
Time-Dependence of Subsurface Solar Convection Using the Time-Distance Deep-Focus Method
John T. Stefan, Alexander G. Kosovichev, Gustavo Guerrero +1
We re-examine the deep-focus methodology of time-distance helioseismology previously used to estimate the power spectrum of the solar convection at a depth of about 30 Mm, which wa…
Improving Our Knowledge of the Solar Near-Surface Shear Layer: The Special Case of the Leptocline
Jean-Pierre Rozelot, Alexander Kosovichev, Irina Kitiashvili
The discovery of the solar activity cycle was linked from the outset to the observation of the temporal variability of sunspots, which we know to be the result of complex processes…
Properties of Turbulent Convection and Large-Scale Flows in a Rotating F-type Star Revealed by 3D Realistic Radiative Hydrodynamic Simulations
Irina N. Kitiashvili, Alexander G. Kosovichev, Alan A. Wray
The nonlinear coupling between stellar convection and rotation is of great interest because it relates to understanding both stellar evolution and activity. We investigated the inf…
Fe I 6173 Å Emission During White-Light Solar Flares
Samuel Granovsky, Alexander G. Kosovichev, Viacheslav M. Sadykov +2
Between 2017 and 2024, the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory has observed numerous white-light solar flares (WLFs). HMI spectro-polarime…
Solar Active Regions Emergence Prediction Using Long Short-Term Memory Networks
Spiridon Kasapis, Irina N. Kitiashvili, Alexander G. Kosovichev +1
We developed Long Short-Term Memory (LSTM) models to predict the formation of active regions (ARs) on the solar surface. Using the Doppler shift velocity, the continuum intensity,…
Forecasting SEP Events During Solar Cycles 23 and 24 Using Interpretable Machine Learning
Spiridon Kasapis, Irina N. Kitiashvili, Paul Kosovich +4
Prediction of the Solar Energetic Particle (SEP) events garner increasing interest as space missions extend beyond Earth's protective magnetosphere. These events, which are, in mos…
The Random Hivemind: An Ensemble Deep Learner Application to Solar Energetic Particle Prediction Problem
Patrick M. O'Keefe, Viacheslav Sadykov, Alexander Kosovichev +8
The application of machine learning and deep learning, including the wide use of non-ensemble, conventional neural networks (CoNN), for predicting various phenomena has become very…
How big is the Sun: Solar diameter changes over time
J. P. Rozelot, A. G. Kosovichev, A. Kilcik
The measurement of the Sun's diameter has been first tackled by the Greek astronomers from a geometric point of view. Their estimation of ~1800", although incorrect, was not truly…
Understanding solar torsional oscillations from global dynamo models
G. Guerrero, P. K. Smolarkiewicz, E. M. de Gouveia Dal Pino +2
The phenomenon of solar "torsional oscillations" (TO) represents migratory zonal flows associated with the solar cycle. These flows are observed on the solar surface and, according…
Realistic modeling of local dynamo processes on the Sun
I. N. Kitiashvili, A. G. Kosovichev, N. N. Mansour +1
Magnetic fields are usually observed in the quiet Sun as small-scale elements that cover the entire solar surface (the `salt and pepper' patterns in line-of-sight magnetograms). By…
Fine structure of flare ribbons and evolution of electric currents
I. N. Sharykin, A. G. Kosovichev
Emission of solar flares across the electromagnetic spectrum is often observed in the form of two expanding ribbons. The standard flare model explains the flare ribbons as footpoin…
Energy Release and Initiation of Sunquake in C-class Flare
I. N. Sharykin, A. G. Kosovichev, I. V. Zimovets
We present analysis of C7.0 solar flare of Febrary 17, 2013, revealing a strong helioseismic response (sunquake) caused by a very compact impact in the photosphere. This is the wea…
Mechanism of local dynamo action on the Sun
I. N. Kitiashvili, A. G. Kosovichev, N. N. Mansour +1
In the quiet Sun, magnetic fields are usually observed as small-scale magnetic elements, `salt and pepper', covering the entire solar surface. By using 3D radiative MHD numerical s…
Differential rotation in solar-like stars from global simulations
G. Guerrero, P. K. Smolarkiewicz, A. G. Kosovichev +1
To explore the physics of large-scale flows in solar-like stars, we perform 3D anelastic simulations of rotating convection for global models with stratification resembling the sol…
Solar differential rotation: hints to reproduce a near-surface shear layer in global simulations
G. Guerrero, P. K. Smolarkiewicz, A. Kosovichev +1
Convective turbulent motions in the solar interior, as well as the mean flows resulting from them, determine the evolution of the solar magnetic field. With the aim to get a better…
Detection of Small-Scale Granular Structures in the Quiet Sun with the New Solar Telescope
Valentyna Abramenko, Vasyl Yurchyshyn, Philip Goode +2
Results of a statistical analysis of solar granulation are presented. A data set of 36 images of a quiet Sun area on the solar disk center was used. The data were obtained with the…
Helioseismic response to X2.2 solar flare of February 15, 2011
Alexander G. Kosovichev
The X2.2-class solar flare of February 15, 2011, produced a powerful sunquake event, representing a helioseismic response to the flare impact in the solar photosphere, which was ob…