12 citations · 41 across the 12 of their papers we have counts for
14 papers
Prediction of Magnetic Flux Evolution During Solar Active Region Emergence using Long Short-Term Memory Networks
Eren Dogan, Spiridon Kasapis, Sarang Patil +5
Solar active regions (ARs) are the primary drivers of space weather events, making their early prediction crucial for operational forecasting systems. We develop machine learning m…
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…
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…
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,…
Predicting the Emergence of Solar Active Regions Using Machine Learning
Spiridon Kasapis, Irina N. Kitiashvili, Alexander G. Kosovichev +2
To create early warning capabilities for upcoming Space Weather disturbances, we have selected a dataset of 61 emerging active regions, which allows us to identify characteristic f…
Spectro-Polarimetric Properties of Sunquake Sources in X1.5 Flare and Evidence for Electron and Proton Beam Impacts
Alexander G. Kosovichev, Viacheslav M. Sadykov, John T. Stefan
The first significant sunquake event of Solar Cycle 25 was observed during the X1.5 flare of May 10, 2022, by the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics…
Can Proton Beam Heating Flare Models Explain Sunquakes?
Viacheslav Sadykov, John Stefan, Alexander Kosovichev +4
SDO/HMI observations reveal a class of solar flares with substantial energy and momentum impacts in the photosphere, concurrent with white-light emission and helioseismic responses…
Exploring the Connection between Helioseismic Travel Time Anomalies and the Emergence of Large Active Regions during Solar Cycle 24
John Stefan, Alexander Kosovichev
We investigate deviations in the mean phase travel time of acoustic waves preceding the emergence of 46 large active regions observed by the Helioseismic and Magnetic Imager (HMI).…
Analysis and Modeling of High-Frequency Emission and Deep Seismic Sources of Sunquakes
John T. Stefan, Alexander G. Kosovichev
Recent work published by Lindsey et al find evidence for a deep and compact seismic source for the sunquake associated with the 2011 July 30 M9.3 flare, as well as seismic emission…
Detection of Travel Time Anisotropy from Subsurface Horizontal Magnetic Fields
John T. Stefan, Alexander G. Kosovichev
A time-distance measurement technique is derived to isolate phase travel time anisotropy caused by subsurface horizontal magnetic fields, and a method which uses the measured aniso…
Analysis of Time-Distance Helioseismology for Detection of Emerging Active Regions
John T. Stefan, Alexander G. Kosovichev, Andrey M. Stejko
A time-distance helioseismic technique, similar to the one used by Ilonidis et al (2011), is applied to two independent numerical models of subsurface sound-speed perturbations to…
Machine Learning in Heliophysics and Space Weather Forecasting: A White Paper of Findings and Recommendations
Gelu Nita, Manolis Georgoulis, Irina Kitiashvili +38
The authors of this white paper met on 16-17 January 2020 at the New Jersey Institute of Technology, Newark, NJ, for a 2-day workshop that brought together a group of heliophysicis…
Estimation of Key Sunquake Parameters through Hydrodynamic Modeling and Cross-Correlation Analysis
John T. Stefan, Alexander G. Kosovichev
Sunquakes are one of the more distinct secondary phenomena related to solar flares, where energy deposition in the lower layers of the Sun's atmosphere excites acoustic waves easil…