Search Publications
A Comparison of Flare Forecasting Methods. IV. Evaluating Consecutive-day Forecasting Patterns
Leka, K. D.; Gallagher, Peter T.; Murray, Sophie A. +21 more
A crucial challenge to successful flare prediction is forecasting periods that transition between "flare-quiet" and "flare-active." Building on earlier studies in this series in which we describe the methodology, details, and results of flare forecasting comparison efforts, we focus here on patterns of forecast outcomes (success and failure) over …
Analysis of Large Deflections of Prominence-CME Events during the Rising Phase of Solar Cycle 24
Stenborg, Guillermo; West, Matthew J.; Mierla, Marilena +7 more
The analysis of the deflection of coronal mass ejection (CME) events plays an important role in the improvement of the forecasting of their geo-effectiveness. Motivated by the scarcity of comprehensive studies of CME events with a focus on the governing conditions that drive deflections during their early stages, we performed an extensive analysis…
Large non-radial propagation of a coronal mass ejection on 2011 January 24
Mierla, M.; D'Huys, E.; Stenborg, G. +6 more
Understanding the deflection of coronal mass ejections (CMEs) is of great interest to the space weather community because of their implications for improving the prediction of CME. This paper aims to shed light into the effects of the coronal magnetic field environment on CME trajectories. We analyze the influence of the magnetic environment on th…
Polarisation and source structure of solar stationary type IV radio bursts
Klein, Karl-Ludwig; Salas-Matamoros, Carolina
The reconfiguration of the magnetic field during and after a coronal mass ejection (CME) may be accompanied by radio emission from non-thermal electrons. In particular, stationary type IV bursts (also called storm continua) are emitted by electrons in closed magnetic configurations usually located in the wake of the outward-travelling CME. Althoug…
Investigation of the Middle Corona with SWAP and a Data-Driven Non-Potential Coronal Magnetic Field Model
West, Matthew J.; Meyer, Karen A.; Upton, Lisa A. +2 more
The large field-of-view of the Sun Watcher using Active Pixel System detector and Image Processing (SWAP) instrument onboard the PRoject for Onboard Autonomy 2 (PROBA2) spacecraft provides a unique opportunity to study extended coronal structures observed in the EUV in conjunction with global coronal magnetic field simulations. A global non-potent…
Electron acceleration and radio emission following the early interaction of two coronal mass ejections
Palmerio, E.; Magdalenić, J.; Kilpua, E. K. J. +6 more
Context. Coronal mass ejections (CMEs) are large eruptions of magnetised plasma from the Sun that are often accompanied by solar radio bursts produced by accelerated electrons.
Aims: A powerful source for accelerating electron beams are CME-driven shocks, however, there are other mechanisms capable of accelerating electrons during a CME erupt…
Three-Dimensional Reconstructions of Coronal Wave Surfaces Using a New Mask-Fitting Method
Feng, Li; Lu, Lei; Gan, Weiqun +5 more
Coronal waves are large-scale disturbances often driven by coronal mass ejections (CMEs). We investigate a spectacular wave event on 7 March 2012, which is associated with an X5.4 flare (SOL2012-03-07). By using a running center-median (RCM) filtering method for the detection of temporal variations in extreme ultraviolet (EUV) images, we enhance t…
Extended radio emission associated with a breakout eruption from the back side of the Sun
Palmerio, E.; Kilpua, E. K. J.; Lynch, B. J. +1 more
Context. Coronal mass ejections (CMEs) on the Sun are the largest explosions in the Solar System that can drive powerful plasma shocks. The eruptions, shocks, and other processes associated to CMEs are efficient particle accelerators and the accelerated electrons in particular can produce radio bursts through the plasma emission mechanism.
Ai…
Solar Total Eclipse of 21 August 2017: Study of the Inner Corona Dynamical Events Leading to a CME
Filippov, Boris; Koutchmy, Serge; Lefaudeux, Nicolas
Total solar eclipse (TSE) coronal large- and small-scale events were reported in the historical literature but a definite synoptic coverage was missing for studying a relationship with the more general magnetic context of the solar-disk. We here analyze temporal changes in the solar corona before, during, and after the total solar eclipse on 21 Au…
Long-Term Evolution of the Solar Corona Using PROBA2 Data
Berghmans, David; West, Matthew J.; Mierla, Marilena +5 more
We use The Sun Watcher with Active Pixel System detector and Image Processing (SWAP) imager onboard the Project for Onboard Autonomy 2 (PROBA2) mission to study the evolution of large-scale EUV structures in the solar corona observed throughout Solar Cycle 24 (from 2010 to 2019). We discuss the evolution of the on-disk coronal features and at diff…