Search Publications
Solar Soft X-ray Irradiance Variability III: Magnetic Field Variations of Coronal X-ray Features
Matsumoto, Takuma; Masuda, Satoshi; DeLuca, Edward +7 more
The magnetic field changes the radiative output of the Sun and is the main source for all the solar surface features. To study the role of the underlying photospheric magnetic field in relation to emission features observed in the solar corona, we have used the full-disk soft X-ray images from Hinode/X-Ray Telescope (Hinode/XRT) and the magnetogra…
New Anisotropic Cosmic-Ray Enhancement (ACRE) Event on 5 November 2023 Due to Complex Heliospheric Conditions
Larsen, Nicholas; Gil, Agnieszka; Usoskin, Ilya +2 more
The variability of galactic cosmic rays near Earth is nearly isotropic and driven by large-scale heliospheric modulation but rarely can very local anisotropic events be observed in low-energy cosmic rays. These anisotropic cosmic-ray enhancement (ACRE) events are related to interplanetary transients. Until now, two such events have been known. Her…
Prediction of Geoeffective CMEs Using SOHO Images and Deep Learning
Jing, Ju; Wang, Haimin; Yurchyshyn, Vasyl +6 more
The application of machine learning to the study of coronal mass ejections (CMEs) and their impacts on Earth has seen significant growth recently. Understanding and forecasting CME geoeffectiveness are crucial for protecting infrastructure in space and ensuring the resilience of technological systems on Earth. Here we present GeoCME, a deep-learni…
Coronal Signatures of Flare Generated Fast-Mode Wave at EUV and Radio Wavelengths
Vasanth, V.
This paper presents a detailed study of the type II solar radio burst that occurred on 06 March 2014 using combined data analysis. It is a classical radio event consisting of type III radio burst and a following type II radio burst in the dynamic spectrum. The type II radio burst is observed between 235 – 130 MHz (120 – 60 MHz) in harmonic (fundam…
Solar Radio Burst Prediction Based on a Multimodal Model
Feng, S. W.; Wang, Y. H.; Wang, J. +5 more
Solar radio bursts are intense radio radiation sources that occur during the energy-release process and represent a hot topic in solar-physics and space-weather research. In this paper, we present a multimode prediction model for daily solar radio bursts. The model uses deep learning and machine learning to obtain data information from different d…
Comprehensive Characterization of the Dynamics of Two Coronal Mass Ejections in the Outer Corona
Nieves-Chinchilla, Teresa; Cremades, Hebe; Balmaceda, Laura +1 more
Coronal mass ejections (CMEs) play a key role in determining space-weather conditions. Therefore, it is important to understand their evolution throughout the heliosphere. In this work, we carefully analyze the evolution of two kinematically different CMEs that erupted on 16 June 2010 and 14 June 2011, in a range of heliospheric distances of appro…
High-Resolution Observation of Blowout Jets Regulated by Sunspot Rotation
Veronig, Astrid M.; Gan, Weiqun; Liu, Rui +4 more
Coronal jets are believed to be the miniature version of large-scale solar eruptions. In particular, the eruption of a minifilament inside the base arch is suggested to be the trigger and even driver of blowout jets. Here, we propose an alternative triggering mechanism, based on high-resolution Hα observations of a blowout jet associated with a mi…
Modeling Global Magnetic-Flux Emergence in Bipolar Solar-Active Regions
Démoulin, Pascal; Mandrini, Cristina H.; López Fuentes, Marcelo +2 more
Active regions (ARs) appear in the solar atmosphere as a consequence of the emergence of magnetic-flux ropes (FR). In this study, we use Bayesian methods to analyze line-of-sight magnetograms of emerging ARs. We employ a FR model consisting of a half-torus field structure based on eight parameters. The goal is to derive constrained physical parame…
Analysis of Overtones in Transverse Oscillations of Coronal Loops of an Active Region
K., Safna Banu; Maurya, Ram Ajor
We investigate the fundamental mode and overtones in the transverse oscillations of coronal loops associated with an active region using intensity observations taken by the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO). The fundamental periods of the two selected coronal loops are found to be 17.0 minutes and 15.2…
Early Evolution of Earth-Directed Coronal Mass Ejections in the Vicinity of Coronal Holes
Dumbović, Mateja; Temmer, Manuela; Vršnak, Bojan +3 more
We investigate the deflection and rotation behaviour of 49 Earth-directed coronal mass ejections (CMEs) spanning the period from 2010 to 2020 aiming to understand the potential influence of coronal holes (CHs) on their trajectories. Our analysis incorporates data from coronagraphic observations captured from multiple vantage points, as well as ext…