A5025958944- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Stellar, planetary, and galactic studies
- Atmospheric Ozone and Climate
- Radiation Therapy and Dosimetry
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Planetary Science and Exploration
- Geomagnetism and Paleomagnetism Studies
- Atomic and Subatomic Physics Research
- Space Exploration and Technology
- Dark Matter and Cosmic Phenomena
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Nuclear Physics and Applications
- Gamma-ray bursts and supernovae
- Radioactivity and Radon Measurements
- Astrophysics and Star Formation Studies
- Atmospheric and Environmental Gas Dynamics
- Solar Radiation and Photovoltaics
- Spaceflight effects on biology
- Spectroscopy and Laser Applications
- Spacecraft Design and Technology
- Radioactive contamination and transfer
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2025
Planetary Science Institute
2025
University of Oslo
2025
Kiel University
2015-2024
Lund University
2016-2024
Fachhochschule Kiel
2017-2024
Australian National University
2024
Goddard Space Flight Center
2016-2024
University of Oulu
2024
University of Helsinki
2024
Aims. The first relativistic solar proton event of cycle 25 was detected on 28 October 2021 by neutron monitors (NMs) the ground and particle detectors board spacecraft in near-Earth space. This is ground-level enhancement (GLE) current cycle. A detailed reconstruction NM response together with identification eruption that generated these particles investigated based situ remote-sensing measurements. Methods. In observations from a few MeV to ∼500 were combined detection flare soft X-rays,...
Cosmogenic Isotopes are produced in the Earth's atmosphere due to interaction of galactic cosmic rays with nuclei atmospheric atoms. Among others, 10 Be concentration ice cores depends on ray flux outside magnetosphere and provides therefore a unique tool investigate solar modulation over very long time periods. In this study we importance different local interstellar proton spectra often used literature obtained magnetosphere. order parameterize heliospheric apply force‐field solution using...
Recent revisions in the sunspot records illustrate challenges related to obtaining a 400-year-long observational record of past solar-activity changes. Cosmogenic radionuclides offer possibility an alternative and completely independent solar variability. Here, we that these great potential for quantitative reconstructions far back into past, provide updated radionuclide-based 2000 years. However, cosmogenic-radionuclide are also influenced by processes activity, leading need critical...
Abstract With Voyager1 crossing the outer boundary of our solar system at end 2012, for first time in instrumental era an unmodulated local interstellar spectrum (LIS) galactic particle energies below ~500 MeV has been measured. On basis these as well Payload Antimatter Matter Exploration and Light‐nuclei Astrophysics (PAMELA) Alpha Magnetic Spectrometer (AMS02) measurements, most recently, three new LIS models have proposed literature. In this study we compare newest to previously often...
Abstract Cosmogenic radionuclide records from polar ice cores provide unique insights into past cosmic ray flux variations. They allow reconstructions of solar activity, space weather, and geomagnetic field changes, carbon cycle changes. However, all these applications rely on the proportionality core to global mean production rate This premise has been long debated a model data‐perspective. Here, we address this issue through atmospheric mixing experiments comparison independent data. We...
On their way through the heliosphere, Galactic Cosmic Rays (GCRs) are modulated by various effects before they can be detected at Earth. This process described Parker equation, which calculates phase space distribution of GCRs depending on main modulation processes: convection, drifts, diffusion and adiabatic energy changes. A first order approximation this equation is force field approach, reducing it to a one-parameter dependency, solar potential $\phi$. Utilizing possible reconstruct...
The current progress in the detection of terrestrial type exoplanets has opened a new avenue characterization exoplanetary atmospheres and search for biosignatures life with upcoming ground-based space missions. To specify conditions favorable origin, development sustainment as we know it other worlds, need to understand nature astrospheric, atmospheric surface environments habitable zones around G-K-M dwarfs including our young Sun. Global environment is formed by propagated disturbances...
Abstract Upcoming missions, including the James Webb Space Telescope, will soon characterize atmospheres of terrestrial-type exoplanets in habitable zones around cool K- and M-type stars by searching for atmospheric biosignatures. Recent observations suggest that ionizing radiation particle environment from active planet hosts may be detrimental to exoplanetary habitability. Since no direct information on field is available, empirical relations between signatures stellar activity, sizes...
The solar energetic particle event on 20 January 2005 was one of the largest ground level events ever observed. Neutron monitor stations in Antarctic recorded count rate increases several thousand percent caused by secondary particles, and it took more than 36 h to return background level. Such huge high cosmic radiation are obviously accompanied considerable changes environment at aviation altitudes. Measurements 28 neutron were used this work numerically approximate primary proton spectra...
Abstract. Studies of the propagation charged energetic particles in Earth's magnetic field go back to Carl Størmer. In end, his investigations finally lead definition so-called cutoff rigidity RC; that is, minimum momentum per charge a particle must have order reach certain geographical location. Employing Monte Carlo simulations with PLANETOCOSMICS code we investigate correlation between geomagnetic structure and rigidity. We show geometry has considerable influence on resulting...
Abstract We present the Atmospheric Radiation Interaction Simulator (AtRIS), a newly developed GEANT4‐based code tailored specifically to enable parametric studies of radiation propagation through various (exo)planetary atmospheres. Its main purpose is model altitude‐dependent atmospheric secondary particle environment and calculate ion pair production rates, which are mandatory input for chemistry models in order to, example, directly characterize habitability modeled planet. Similar codes...
Abstract The atmospheres of small, potentially rocky exoplanets are expected to cover a diverse range in composition and mass. Studying such objects therefore requires flexible wide-ranging modeling capabilities. We present this work the essential development steps that lead our radiative transfer module, REDFOX, validate REDFOX for solar system planets Earth, Venus, Mars, as well steam atmospheres. is k -distribution model using correlated- approach with random overlap method calculation...
A new GEANT4 particle transport model -- the Atmospheric Radiation Interaction Simulator (AtRIS, Banjac et al. 2018a. J. Geophys. Res.) has been recently developed in order to interaction of radiation with planets. The upcoming instrumentational advancements exoplanetary science, particular transit spectroscopy capabilities missions like JWST and E-ELT, have motivated development a code focus on providing necessary flexibility planet specification (atmosphere soil geometry composition, tidal...
Aims : This paper presents a H2020 project aimed at developing an advanced space weather forecasting tool, combining the MagnetoHydroDynamic (MHD) solar wind and coronal mass ejection (CME) evolution modelling with energetic particle (SEP) transport acceleration model(s). The EUHFORIA 2.0 will address geoeffectiveness of impacts mitigation to avoid (part the) damage, including that extreme events, related eruptions, streams, SEPs, particular emphasis on its application forecast...
The Large Interferometer For Exoplanets (LIFE) is a proposed space mission that enables the spectral characterization of thermal emission exoplanets in solar neighborhood. designed to search for global atmospheric biosignatures on dozens temperate terrestrial and it will naturally investigate diversity other worlds. Here, we review status concept, discuss key parameters, outline trade-offs related mission's architecture. In preparation an upcoming concept study, define baseline based...
Abstract The threat that solar storms pose to our ever‐modernizing society has gathered significant interest in the recent past. This is partly due discoveries of large peaks content cosmogenic radionuclides such as radiocarbon ( 14 C) tree rings and beryllium‐10 10 Be) chlorine‐36 36 Cl) ice cores were linked extreme dated past millennia. To better assess they represent, we need quantify relationship between their energy spectrum magnitude with respect measure environmental archives cores....
The cosmic ray (CR) flux, as well the hydrogen flux into atmosphere of an exoplanet, can change composition said atmosphere. Here, we present CR and above To do so, study 3D multi-fluid magentohydrodynamic (MHD) structure astrospheres. We aim to discuss shock stellar wind LHS 1140 using four different models: hydrodynamic (HD) ideal MHD single-fluid models, models for both cases, including a neutral flow from interstellar medium (ISM). in model ionization rate exoplanetary are also...
Abstract Galactic cosmic rays (GCRs) may influence the habitability of exoplanets. The recently proposed relationship between GCR intensities at exoplanetary locations and rotation periods their host stars is here investigated for several M-dwarf astrospheres, namely Proxima Centauri, TRAPPIST-1, GJ 436, LHS1140, using a 3D modulation code. This relation, where higher result from enhanced particle transport along astrospheric magnetic fields that are underwound due to longer stellar periods,...
Extreme Solar Energetic Particle Events (ESPEs) were identified almost a decade ago, providing context for super events unleashed by our host star, the Sun. Their assumed solar origin drives question of their ``worst-case" impact, which could be profound, multifaceted, and devastating technological society. A methodology that directly relates soft X-ray flux $F_{SXR}$ driving flare event to its integral fluence spectrum has recently been proposed Papaioannou et al. (2023). We employ this...
Extreme solar particle events (ESPEs) were identified almost a decade ago, providing context for super unleashed by our host star, the Sun. Their assumed origin drives question of their ``worst-case" impact, which could be profound, multifaceted, and devastating technological society. Recently, we proposed methodology that directly relates soft X-ray flux (F_SXR) driving flare energetic (SEP) event to its integral fluence spectrum. In this study, aim put letter stress test. employed previous...
Whether the Sun is an ordinary G-type star still open scientific question. Stellar surveys by Kepler and TESS however, have revealed that Sun-like stars tend to show much stronger flare activity than Sun. This study aims reassess observed spot of fine-tuning criteria for a more robust definition conditions better comparability between current stars. We updated one recent stellar samples applying new empirical relations starspot size effective temperature derive reliable group sizes. From 265...
On July 25 2017 a multi-step Forbush decrease (FD) with the remarkable total amplitude of more than 15\% was observed by MSL/RAD at Mars. We find that these particle signatures are related to very pronounced plasma and magnetic field detected in situ STEREO-A on 24 2017, higher average strength reaching 60 nT. In time period relatively small longitudinal separation (46 degrees) Mars both were located back side Sun as viewed from Earth. analyse number multi-spacecraft multi-instrument (both...
Context. The first opportunity to detect indications for life outside of the Solar System may be provided already within next decade with upcoming missions such as James Webb Space Telescope (JWST), European Extremely Large (E-ELT) and Atmospheric Remote-sensing Infrared Exoplanet Large-survey (ARIEL) mission, searching atmospheric biosignatures on planets in habitable zone cool K- M-stars. Nevertheless, their harsh stellar radiation particle environment could lead photochemical loss...
Abstract With upcoming missions such as the James Webb Space Telescope, European Extremely Large and Atmospheric Remote-sensing Infrared Exoplanet Large-survey, we soon will be on verge of detecting characterizing Earth-like exoplanetary atmospheres for first time. These planets are most likely to found around smaller cooler K- M-type stars. However, recent observations showed that their radiation environment might much harsher than Sun. Thus, exoplanets exposed an enhanced stellar...
The interpretation of recent observations bow shocks around O-stars and the creation corresponding models require a detailed understanding associated (magneto-)hydrodynamic structures. We base our study on three-dimensional numerical magneto-)hydrodynamical models, which are analyzed using dynamically relevant parameters, in particular, (magneto)sonic Mach numbers. analytic Rankine-Hugoniot relation for HD MHD compared with those obtained by model. In that context we also show only distance...