A. Warmuth
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View article: Solar Orbiter reveals persistent magnetic reconnection in medium-scale filament eruptions
Solar Orbiter reveals persistent magnetic reconnection in medium-scale filament eruptions Open
Solar filament eruptions play a key role in driving space weather, yet their fine-scale evolution remains poorly understood due to observational limitations. Using unprecedented high-resolution observations from Solar Orbiter’s Extreme Ult…
View article: SolarZip: An efficient and adaptive compression framework for Solar EUV imaging data
SolarZip: An efficient and adaptive compression framework for Solar EUV imaging data Open
Context. With the advancement of solar physics research, next-generation solar space missions and ground-based telescopes face significant challenges in efficiently transmitting and/or storing large-scale observational data. Aims. We have …
View article: Extremely diverse coronal jets accompanying an erupting filament captured by Solar Orbiter
Extremely diverse coronal jets accompanying an erupting filament captured by Solar Orbiter Open
Solar jets are collimated plasma ejections driven by magnetic reconnection, which play a critical role in the energy release and mass transport in the solar atmosphere. Using Solar Orbiter’s Extreme Ultraviolet Imager (EUI) with its unprec…
View article: Extremely diverse coronal jets accompanying an erupting filament captured by Solar Orbiter
Extremely diverse coronal jets accompanying an erupting filament captured by Solar Orbiter Open
Solar jets are collimated plasma ejections driven by magnetic reconnection, which play a critical role in the energy release and mass transport in the solar atmosphere. Using Solar Orbiter's Extreme Ultraviolet Imager (EUI) with its unprec…
View article: Solar Orbiter reveals persistent magnetic reconnection in medium-scale filament eruptions
Solar Orbiter reveals persistent magnetic reconnection in medium-scale filament eruptions Open
Solar filament eruptions play a key role in driving space weather, yet their fine-scale evolution remains poorly understood due to observational limitations. Using unprecedented high-resolution observations from Solar Orbiter's Extreme Ult…
View article: CoSEE-Cat: A Comprehensive Solar Energetic Electron event Catalogue obtained from combined in situ and remote-sensing observations from Solar Orbiter
CoSEE-Cat: A Comprehensive Solar Energetic Electron event Catalogue obtained from combined in situ and remote-sensing observations from Solar Orbiter Open
Context. The acceleration of particles at the Sun and their propagation through interplanetary space are key topics in heliophysics. Specifically, solar energetic electrons (SEEs) measured in situ can be linked to solar events such as flar…
View article: Ion-rich Acceleration during an Eruptive Flux Rope Event in a Multiple Null-point Configuration
Ion-rich Acceleration during an Eruptive Flux Rope Event in a Multiple Null-point Configuration Open
We report on the γ -ray emission above 100 MeV from the GOES M3.3 flare SOL2012-06-03. The hard X-ray (HXR) and microwave emissions have typical time profiles with a fast rise to a well-defined peak followed by a slower decay. The >100 MeV…
View article: Spectral Analysis of the most intense Solar Energetic Electron Events Observed with Solar Orbiter from December 2020 to December 2022
Spectral Analysis of the most intense Solar Energetic Electron Events Observed with Solar Orbiter from December 2020 to December 2022 Open
The Sun produces eruptive events that release energetic particles, such as protons and electrons, into the heliosphere. These solar energetic particles (SEPs) can reach exceptionally high energies and pose risks to satellite technology and…
View article: The Horizon Europe SOLER project (2024-2027): project objectives and first results
The Horizon Europe SOLER project (2024-2027): project objectives and first results Open
The Energetic Solar Eruptions: Data and Analysis Tools (SOLER) project (2024–2027) will investigate the most energetic phenomena occurring at the Sun using the newly expanded unprecedented heliospheric spacecraft fleet including Sola…
View article: Spatially Resolved Oscillations of a Flare Looptop X-Ray Source
Spatially Resolved Oscillations of a Flare Looptop X-Ray Source Open
The looptop region in solar flares is a crucial site to understand the physical processes of magnetic reconnection and particle acceleration. Here, we report novel details of a flare looptop X-ray source that is associated with electron ac…
View article: Magnetic connectivity of coronal loops and flare-accelerated electrons in a B-class flare
Magnetic connectivity of coronal loops and flare-accelerated electrons in a B-class flare Open
Context. In solar flares, non-potential magnetic field energy is transferred to particle acceleration, heating, and radiation. Multi-wavelength observations of the solar corona in extreme ultraviolet (EUV) and X-ray show the consequences o…
View article: A Rapid Sequence of Solar Energetic Particle Events Associated with a Series of Extreme-ultraviolet Jets: Solar Orbiter, STEREO-A, and Near-Earth Spacecraft Observations
A Rapid Sequence of Solar Energetic Particle Events Associated with a Series of Extreme-ultraviolet Jets: Solar Orbiter, STEREO-A, and Near-Earth Spacecraft Observations Open
A series of solar energetic electron (SEE) events was observed from 2022 November 9 to November 15 by Solar Orbiter, STEREO-A, and near-Earth spacecraft. At least 32 SEE intensity enhancements at energies >10 keV were clearly distinguishab…
View article: A catalogue of large solar energetic particle events observed by Solar Orbiter for the first ~ four years of measurements (2020–2023)
A catalogue of large solar energetic particle events observed by Solar Orbiter for the first ~ four years of measurements (2020–2023) Open
Solar Orbiter (SO) observations provide an unprecedented opportunity to study the evolution of solar energetic particle (SEP) events from different locations within the heliosphere. In this work, we have compiled a catalogue of SEP events …
View article: Energy spectra of Solar Energetic Electron Events Observed with Solar Orbiter
Energy spectra of Solar Energetic Electron Events Observed with Solar Orbiter Open
The identification of the phenomena responsible for the acceleration of solar energetic particles (SEP) still challenges current research and limits our forecasting abilities of SEP events. Even the most recent space missions, such as Sola…
View article: Investigating the absence of stellar CMEs through solar observations 
Investigating the absence of stellar CMEs through solar observations  Open
Coronal Mass Ejections (CMEs) remain a focal point of solar and stellar research due to their significant impact on space weather dynamics and exoplanet habitability. Unfortunately, it has so far proven difficult to measure these events on…
View article: Unusually long path length for a nearly scatter-free solar particle event observed by Solar Orbiter at 0.43 au
Unusually long path length for a nearly scatter-free solar particle event observed by Solar Orbiter at 0.43 au Open
Solar energetic particles (SEPs) are bound to the interplanetary magnetic field (IMF) by the Lorentz force. The expansion of the IMF close to the Sun focuses the particle pitch-angle distribution, and scattering counteracts this focusing. …
View article: Evidence for flare-accelerated particles in large scale loops in the behind-the-limb gamma-ray solar flare of September 29, 2022
Evidence for flare-accelerated particles in large scale loops in the behind-the-limb gamma-ray solar flare of September 29, 2022 Open
We report on the detection of the gamma-ray emission above 100 MeV from the solar flare of September 29, 2022, by Fermi LAT with simultaneous coverage in HXR by Solar Orbiter STIX. The Solar Orbiter-Earth separation was 178° at the time of…
View article: The Solar Particle Acceleration Radiation and Kinetics (SPARK) Mission Concept
The Solar Particle Acceleration Radiation and Kinetics (SPARK) Mission Concept Open
Particle acceleration is a fundamental process arising in many astrophysical objects, including active galactic nuclei, black holes, neutron stars, gamma-ray bursts, accretion disks, solar and stellar coronae, and planetary magnetospheres.…
View article: The Large Imaging Spectrometer for Solar Accelerated Nuclei (LISSAN): A Next-Generation Solar γ-ray Spectroscopic Imaging Instrument Concept
The Large Imaging Spectrometer for Solar Accelerated Nuclei (LISSAN): A Next-Generation Solar γ-ray Spectroscopic Imaging Instrument Concept Open
Models of particle acceleration in solar eruptive events suggest that roughly equal energy may go into accelerating electrons and ions. However, while previous solar X-ray spectroscopic imagers have transformed our understanding of electro…
View article: A comparative study of two X2.2 and X9.3 solar flares observed with HARPS-N
A comparative study of two X2.2 and X9.3 solar flares observed with HARPS-N Open
Context. Stellar flares cannot be spatially resolved, which complicates ascertaining the physical processes behind particular spectral signatures. Due to their proximity to Earth, solar flares can serve as a stepping stone for understandin…
View article: 3D evolution of a solar flare thermal X-ray loop-top source
3D evolution of a solar flare thermal X-ray loop-top source Open
Context. The recent launch of Solar Orbiter has placed a solar X-ray imager (Spectrometer/Telescope for Imaging X-rays; STIX) beyond Earth orbit for the first time. This introduces the possibility of deriving the 3D locations and volumes o…
View article: The existence of hot X-ray onsets in solar flares
The existence of hot X-ray onsets in solar flares Open
Context. It is well known among the scientific community that solar flare activity often begins well before the main impulsive energy release. However, a consistent explanation for this phenomenon has not yet been established. Aims. Our ai…
View article: The STIX Imaging Concept
The STIX Imaging Concept Open
View article: A heliospheric density and magnetic field model
A heliospheric density and magnetic field model Open
Context. The radial evolution of the density of the plasma and the magnetic field in the heliosphere, especially in the region between the solar corona and the Earth’s orbit, has been a topic of active research for several decades. Both re…
View article: A comparative study of two X2.2 and X9.3 solar flares observed with HARPS-N: Reconciling Sun-as-a-star spectroscopy and high-spatial resolution solar observations in the context of the solar-stellar connection
A comparative study of two X2.2 and X9.3 solar flares observed with HARPS-N: Reconciling Sun-as-a-star spectroscopy and high-spatial resolution solar observations in the context of the solar-stellar connection Open
Stellar flares cannot be spatially resolved, which complicates ascertaining the physical processes behind particular spectral signatures. Due to their proximity to Earth, solar flares can serve as a stepping stone for understanding their s…
View article: Unusually long path length for a nearly scatter-free solar particle event observed by Solar Orbiter at 0.43 au
Unusually long path length for a nearly scatter-free solar particle event observed by Solar Orbiter at 0.43 au Open
Context. After their acceleration and release at the Sun, solar energetic particles (SEPs) are injected into the interplanetary medium and are bound to the interplanetary magnetic field (IMF) by the Lorentz force. The expansion of the IMF …
View article: Observational Signatures of Electron-driven Chromospheric Evaporation in a White-light Flare
Observational Signatures of Electron-driven Chromospheric Evaporation in a White-light Flare Open
We investigate observational signatures of explosive chromospheric evaporation during a white-light flare (WLF) that occurred on 2022 August 27. Using the moment analysis, bisector techniques, and the Gaussian fitting method, redshifted ve…
View article: Firefly: The Case for a Holistic Understanding of the Global Structure and Dynamics of the Sun and the Heliosphere
Firefly: The Case for a Holistic Understanding of the Global Structure and Dynamics of the Sun and the Heliosphere Open
status: Published
View article: A multiple spacecraft detection of the 2 April 2022 M-class flare and filament eruption during the first close Solar Orbiter perihelion
A multiple spacecraft detection of the 2 April 2022 M-class flare and filament eruption during the first close Solar Orbiter perihelion Open
Context. The Solar Orbiter mission completed its first remote-sensing observation windows in the spring of 2022. On 2 April 2022, an M-class flare followed by a filament eruption was seen both by the instruments on board the mission and fr…
View article: A multiple spacecraft detection of the 2 April 2022 M-class flare and filament eruption during the first close Solar Orbiter perihelion
A multiple spacecraft detection of the 2 April 2022 M-class flare and filament eruption during the first close Solar Orbiter perihelion Open
The Solar Orbiter mission completed its first remote-sensing observation windows in the spring of 2022. On 2/4/2022, an M-class flare followed by a filament eruption was seen both by the instruments on board the mission and from several ob…