Zobrazeno 1 - 10
of 234
pro vyhledávání: '"Kosovichev, Alexander G"'
Autor:
Granovsky, Samuel, Kosovichev, Alexander G., Sadykov, Viacheslav M., Kerr, Graham S., Allred, Joel C.
Between 2017 and 2024, the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory has observed several white-light solar flares. Notably, for the X9.3 flare of September 6, 2017, HMI spectro-polarimetric observations reveal one
Externí odkaz:
http://arxiv.org/abs/2410.07440
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, and the magnetic field observations from the Solar Dynamics Observator
Externí odkaz:
http://arxiv.org/abs/2409.17421
Autor:
Kasapis, Spiridon, Kitiashvili, Irina N., Kosovich, Paul, Kosovichev, Alexander G., Sadykov, Viacheslav M., O'Keefe, Patrick, Wang, Vincent
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 most cases, products of magnetic reconnection-driven processes during sol
Externí odkaz:
http://arxiv.org/abs/2403.02536
Solar differential rotation exhibits a prominent feature: its cyclic variations over the solar cycle, referred to as zonal flows or torsional oscillations, are observed throughout the convection zone. Given the challenge of measuring magnetic fields
Externí odkaz:
http://arxiv.org/abs/2402.15647
Autor:
Kasapis, Spiridon, Kitiashvili, Irina N., Kosovichev, Alexander G., Stefan, John T., Apte, Bhairavi
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 features in the evolution of acoustic power density to predict continuu
Externí odkaz:
http://arxiv.org/abs/2402.08890
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) onboard the S
Externí odkaz:
http://arxiv.org/abs/2401.17598
Autor:
Kosovich, Paul A., Kosovichev, Alexander G., Sadykov, Viacheslav M., Kasapis, Spiridon, Kitiashvili, Irina N., O'Keefe, Patrick M., Ali, Aatiya, Oria, Vincent, Granovsky, Samuel, Chong, Chun Jie, Nita, Gelu M.
Solar flare prediction studies have been recently conducted with the use of Space-Weather MDI (Michelson Doppler Imager onboard Solar and Heliospheric Observatory) Active Region Patches (SMARP) and Space-Weather HMI (Helioseismic and Magnetic Imager
Externí odkaz:
http://arxiv.org/abs/2401.05591
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 Observatory. We perform a detailed spectro-polarimetric analysis of th
Externí odkaz:
http://arxiv.org/abs/2309.07346
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 extending up to 10 mHz. We examine the sunquake independently, and a
Externí odkaz:
http://arxiv.org/abs/2209.11286
Publikováno v:
The Astrophysical Journal, 937(1):41, 2022
Spectral analysis of the spatial structure of solar subphotospheric convection is carried out for subsurface flow maps constructed using the time--distance helioseismological technique. The source data are obtained from the Helioseismic and Magnetic
Externí odkaz:
http://arxiv.org/abs/2208.04642