113 citations · 876 across the 27 of their papers we have counts for
28 papers
CoSEE-Cat: A Comprehensive Solar Energetic Electron event Catalogue obtained from combined in situ and remote-sensing observations from Solar Orbiter -- Catalogue description and first statistical results
A. Warmuth, F. Schuller, R. Gómez-Herrero +39
(abridged) The acceleration of particles at the Sun and their propagation through interplanetary space are key topics in heliophysics. Specifically, solar energetic electrons (SEEs…
Exploring the Dynamics of CME-Driven Shocks by Comparing Numerical Modeling and Observations
Meng Jin, Gang Li, Nariaki Nitta +9
Shocks driven by coronal mass ejections (CMEs) are primary drivers of gradual solar energetic particle (SEP) events, posing significant risks to space technology and astronauts. Co…
Towards Synthetic Magnetic Turbulence with Coherent Structures
Jeremiah Lübke, Frederic Effenberger, Mike Wilbert +2
Synthetic turbulence is a relevant tool to study complex astrophysical and space plasma environments inaccessible by direct simulation. However, conventional models lack intermitte…
A Comparative Study on Generative Models for High Resolution Solar Observation Imaging
Mehdi Cherti, Alexander Czernik, Stefan Kesselheim +2
Solar activity is one of the main drivers of variability in our solar system and the key source of space weather phenomena that affect Earth and near Earth space. The extensive rec…
Focused Space Weather Strategy for Securing Earth, and Human Exploration of the Moon and Mars
A. Posner, N. Arge, K. Cho +12
This white paper recognizes gaps in observations that will, when addressed, much improve solar radiation hazard and geomagnetic storm forecasting. Radiation forecasting depends on…
Connecting solar flare hard X-ray spectra to in situ electron spectra. A comparison of RHESSI and STEREO/SEPT observations
Nina Dresing, A. Warmuth, F. Effenberger +4
We compare the characteristics of flare-accelerated energetic electrons at the Sun with those injected into interplanetary space. We have identified 17 energetic electron events we…
A Primer on Focused Solar Energetic Particle Transport: Basic physics and recent modelling results
J. P. van den Berg, R. D. Strauss, F. Effenberger
The basics of focused transport as applied to solar energetic particles are reviewed, paying special attention to areas of common misconception. The micro-physics of charged partic…
Statistical results for solar energetic electron spectra observed over 12 years with STEREO/SEPT
Nina Dresing, Frederic Effenberger, Raul Gomez-Herrero +5
We present a statistical analysis of near-relativistic (NR) solar energetic electron event spectra near 1au. We use measurements of the STEREO Solar Electron and Proton Telescope (…
Statistical analysis of interplanetary magnetic field path lengths from solar energetic electron events observed by WIND
Lulu Zhao, Gang Li, Ming Zhang +3
We calculate the interplanetary magnetic field path lengths traveled by electrons in solar electron events detected by the WIND 3DP instrument from to . The velocity d…
The Relation Between Escape and Scattering Times of Energetic Particles in a Turbulent Magnetized Plasma: Application to Solar Flares
Frederic Effenberger, Vahé Petrosian
A knowledge of the particle escape time from the acceleration regions of many space and astrophysical sources is of critical importance in the analysis of emission signatures produ…
Probing the Puzzle of Behind-the-Limb -ray Flares: Data-driven Simulations of Magnetic Connectivity and CME-driven Shock Evolution
Meng Jin, Vahe Petrosian, Wei Liu +8
Recent detections of high-energy -rays from behind-the-limb (BTL) solar flares by the \emph{Fermi -ray Space Telescope} pose a puzzle and challenge on the particle accelerati…
Electron Power-Law Spectra in Solar and Space Plasmas
M. Oka, J. Birn, M. Battaglia +10
Particles are accelerated to very high, non-thermal energies in solar and space plasma environments. While energy spectra of accelerated electrons often exhibit a power law, it rem…
The effect of turbulence strength on meandering field lines and Solar Energetic Particle event extents
T. Laitinen, F. Effenberger, A. Kopp +1
Insights into the processes of Solar Energetic Particle (SEP) propagation are essential for understanding how solar eruptions affect the radiation environment of near-Earth space.…
A Hitch-hiker's Guide to Stochastic Differential Equations: Solution Methods for Energetic Particle Transport in Space Physics and Astrophysics
R. Du Toit Strauss, Frederic Effenberger
In this review, an overview of the recent history of stochastic differential equations (SDEs) in application to particle transport problems in space physics and astrophysics is giv…
Hard X-Ray Emission from Partially Occulted Solar Flares: RHESSI Observations in Two Solar Cycles
Frederic Effenberger, Fatima Rubio da Costa, Mitsuo Oka +5
Flares close to the solar limb, where the footpoints are occulted, can reveal the spectrum and structure of the coronal loop-top source in X-rays. We aim at studying the properties…
Hard X-ray morphology of the X1.3 April 25, 2014 partially occulted limb solar flare
Frederic Effenberger, Fatima Rubio da Costa, Vahe Petrosian
At hard X-ray energies, the bright footpoint emission from solar flare loops often prevents a detailed analysis of the weaker loop-top source morphology due to the limited dynamic…
Simulations of 3D Magnetic Merging: Resistive Scalings for Null Point and QSL Reconnection
Frederic Effenberger, I. J. D. Craig
Starting from an exact, steady-state, force-free solution of the magnetohydrodynamic (MHD) equations, we investigate how resistive current layers are induced by perturbing line-tie…
Solar energetic particle access to distant longitudes through turbulent field-line meandering
T. Laitinen, A. Kopp, F. Effenberger +2
Context. Current solar energetic particle (SEP) propagation models describe the effects of interplanetary plasma turbulence on SEPs as diffusion, using a Fokker-Planck (FP) equatio…
Parameter estimation of superdiffusive motion of energetic particles upstream of heliospheric shocks
Silvia Perri, Gaetano Zimbardo, Frederic Effenberger +1
In-situ spacecraft observations recently suggested that the transport of energetic particles accelerated at heliospheric shocks can be anomalous, i.e. the mean square displacement…
The telegraph approximation for focused cosmic-ray transport in the presence of boundaries
Yuri E. Litvinenko, Frederic Effenberger, Reinhard Schlickeiser
Diffusive cosmic-ray transport in nonuniform large-scale magnetic fields in the presence of boundaries is considered. Reflecting and absorbing boundary conditions are derived for a…
Current Singularities at Quasi-Separatrix Layers and Three-Dimensional Magnetic Nulls
I. J. D. Craig, Frederic Effenberger
The open problem of how singular current structures form in line-tied, three-dimensional magnetic fields is addressed. A Lagrangian magneto-frictional relaxation method is employed…
The Diffusion Approximation vs. the Telegraph Equation for Modeling Solar Energetic Particle Transport with Adiabatic Focusing. I. Isotropic Pitch-angle Scattering
Frederic Effenberger, Yuri E. Litvinenko
The diffusion approximation to the Fokker-Planck equation is commonly used to model the transport of solar energetic particles in interplanetary space. In this study, we present ex…
Analytical solutions of a fractional diffusion-advection equation for solar cosmic-ray transport
Yuri E. Litvinenko, Frederic Effenberger
Motivated by recent applications of superdiffusive transport models to shock-accelerated particle distributions in the heliosphere, we solve analytically a one-dimensional fraction…
Pitch-angle scattering in magnetostatic turbulence. I. Test-particle simulations and the validity of analytical results
R. C. Tautz, A. Dosch, F. Effenberger +2
Context. Spacecraft observations have motivated the need for a refined description of the phase-space distribution function. Of particular importance is the pitch-angle diffusion c…