A5018444092- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Solar Radiation and Photovoltaics
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Radiation Therapy and Dosimetry
- Spacecraft Design and Technology
- Atmospheric Ozone and Climate
- Planetary Science and Exploration
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Astrophysics and Star Formation Studies
- Computational Physics and Python Applications
- Space Science and Extraterrestrial Life
- Geomagnetism and Paleomagnetism Studies
- Spacecraft and Cryogenic Technologies
- Dark Matter and Cosmic Phenomena
- Electron and X-Ray Spectroscopy Techniques
- Tropical and Extratropical Cyclones Research
- Particle accelerators and beam dynamics
- Photocathodes and Microchannel Plates
- Solar Thermal and Photovoltaic Systems
- Particle Accelerators and Free-Electron Lasers
University of Turku
2021-2025
Kiel University
2012-2022
Heliophysics
2022
European Space Research and Technology Centre
2021
Johns Hopkins University
2021
Universitat de Barcelona
2021
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2021
Fachhochschule Kiel
2015-2020
Universidad de Alcalá
2016
University of Helsinki
2010
The Solar MAgnetic Connection HAUS 1 tool (Solar-MACH) is an open-source completely written in Python that derives and visualizes the spatial configuration solar magnetic connection of different observers (i.e., spacecraft or planets) heliosphere at times. For doing this, interplanetary space obtained by classic Parker Heliospheric Magnetic Field (HMF). In close vicinity Sun, a Potential Source Surface (PFSS) model can be applied to connect HMF photosphere. Solar-MACH especially aimed...
Abstract On 2022 February 15, an impressive filament eruption was observed off the solar eastern limb from three remote-sensing viewpoints, namely, Earth, STEREO-A, and Solar Orbiter. In addition to representing most-distant at extreme ultraviolet wavelengths—captured by Orbiter's field of view extending above 6 R ⊙ —this event also associated with release a fast (∼2200 km s −1 ) coronal mass ejection (CME) that directed toward BepiColombo Parker Probe. These two probes were separated 2° in...
Simultaneous measurements of solar energetic particle (SEP) events by two or more the spacecraft located near 1 AU during rising phase cycle 24 (i.e., STEREO-A, STEREO-B, and near-Earth such as ACE, SOHO, GOES) are used to determine longitudinal dependence 71–112 keV electron, 0.7–3 MeV 15–40 proton, 25–53 proton peak intensities measured in prompt component SEP events. Distributions for selected 35 with identifiable origin approximated form exp [ − (ϕ ϕ0)2/2σ2], where ϕ is separation...
Context. In February 2011, the two STEREO spacecrafts reached a separation of 180 degrees in longitude, offering complete view Sun for first time ever. When full surface is visible, source active regions solar energetic particle (SEP) events can be identified unambiguously. STEREO, combination with near-Earth observatories such as ACE or SOHO, provides three well separated viewpoints, which build an unprecedented platform from to investigate longitudinal variations SEP events.
Aims. We analyse particle, radio, and X-ray observations during the first relativistic proton event of solar cycle 25 detected on Earth. The aim is to gain insight into relationship between particles in space processes acceleration propagation eruptive events. Methods. To this end, we used ground-based neutron monitor measurements nucleons space-borne electrons with similar speed determine arrival times at 1 AU infer their release times. compared time histories non-thermal atmosphere escape...
Context. A complex and long-lasting solar eruption on 17 April 2021 produced a widespread energetic particle (SEP) event that was observed by five longitudinally well-separated observers in the inner heliosphere covered distances to Sun from 0.42 1 au: BepiColombo, Parker Solar Probe, Orbiter, STEREO A, near-Earth spacecraft. The second SEP detected cycle 25, it relativistic electrons protons. It associated with hard X-ray flare showed multiple peaks over duration of one hour. further...
Abstract The Parker Solar Probe (PSP) and Orbiter (SolO) missions opened a new observational window in the inner heliosphere, which is finally accessible to direct measurements. On 2022 September 5, coronal mass ejection (CME)-driven interplanetary (IP) shock was observed as close 0.07 au by PSP. CME then reached SolO, radially well-aligned at 0.7 au, thus providing us with opportunity study properties different heliocentric distances. We characterize shock, investigate its typical...
Abstract On 2022 February 15–16, multiple spacecraft measured one of the most intense solar energetic particle (SEP) events observed so far in Solar Cycle 25. This study provides an overview interesting observations made by during this event. Parker Probe (PSP) and BepiColombo were close to each other at 0.34–0.37 au (a radial separation ∼0.03 au) as they impacted flank associated coronal mass ejection (CME). At about 100° retrograde direction 1.5 away from Sun, radiation detector on board...
Late on 2011 November 3, STEREO-A, STEREO-B, MESSENGER, and near-Earth spacecraft observed an energetic particle flux enhancement. Based the analysis of in situ plasma observations, their correlation with remote sensing interplanetary transport model, we conclude that increases at multiple locations had a common single-source active region particles filled very broad around Sun. The was located solar backside (as seen from Earth) source large flare, fast wide coronal mass ejection, EIT wave,...
ABSTRACT We investigate the solar phenomena associated with origin of energetic particle (SEP) event observed on 2014 February 25 by a number spacecraft distributed in inner heliosphere over broad range heliolongitudes. These include located near Earth; twin Solar TErrestrial RElations Observatory spacecraft, STEREO-A and STEREO-B , at ∼1 au from Sun 153° west 160° east Earth, respectively; MErcury Surface Space ENvironment GEochemistry Ranging mission (at 0.40 31° Earth); Juno 2.11 48°...
We investigate the solar phenomena associated with origin of energetic particle (SEP) event observed on 2013 April 11 by a number spacecraft distributed in inner heliosphere over broad range heliolongitudes. use Extreme UltraViolet (EUV) and white-light coronagraph observations from Solar Dynamics Observatory (SDO), SOlar Heliospheric (SOHO) twin TErrestrial RElations (STEREO-A STEREO-B) to determine angular extent EUV wave coronal mass ejection (CME) SEP event. compare estimated release...
Abstract The processes responsible for the effective longitudinal transport of solar energetic particles (SEPs) are still not completely understood. We address this issue by simulating SEP electron propagation using a spatially 2D model that includes perpendicular diffusion. By implementing, as far possible, most reasonable estimates (diffusion) coefficients, we compare our results, in qualitative manner, to recent observations at energies 55–105 keV, focusing on distribution peak intensity,...
Context. On 2020 November 29, the first widespread solar energetic particle (SEP) event of cycle 25 was observed at four widely separated locations in inner (≲1 AU) heliosphere. Relativistic electrons as well protons with energies > 50 MeV were by Solar Orbiter (SolO), Parker Probe, Terrestrial Relations Observatory (STEREO)-A and multiple near-Earth spacecraft. The SEP associated an M4.4 class X-ray flare accompanied a coronal mass ejection extreme ultraviolet (EUV) wave type II radio...
Solar Orbiter strives to unveil how the Sun controls and shapes heliosphere fills it with energetic particle radiation. To this end, its Energetic Particle Detector (EPD) has now been in operation, providing excellent data, for just over a year. EPD measures suprathermal particles energy range from few keV up (near-) relativistic energies (few MeV electrons about 500 MeV/nuc ions). We present an overview of initial results first year operations we provide assessment issues limitations....
Abstract We study the role of coronal mass ejection (CME) driven shocks in acceleration solar energetic electrons. Using observations by two STEREO spacecraft, we correlate electron peak intensities particle events measured situ with various parameters associated shocks. These shock were derived combining 3D reconstructions global modeling corona. This technique provides also properties specific regions that are magnetically connected to spacecraft. find significant correlations between and...
Context. On 2020 November 29, an eruptive event occurred in active region located behind the eastern solar limb as seen from Earth. The consisted of M4.4 class flare, a coronal mass ejection, extreme ultraviolet (EUV) wave, and white-light (WL) shock wave. eruption gave rise to first widespread energetic particle (SEP) cycle 25, which was observed at four widely separated heliospheric locations (∼230°). Aims. Our aim is better understand source this SEP event, examine role wave wide...
The complex interaction between shocks and plasma turbulence is extremely important to address crucial features of energy conversion in a broad range astrophysical systems. We study the supercritical, perpendicular shock pre-existing, fully-developed turbulence, employing novel combination magnetohydrodynamic (MHD) small-scale, hybrid-kinetic simulations where propagating through turbulent medium. variability front unperturbed case for two levels upstream fluctuations addressed.We find that...
Context. We study the solar energetic particle (SEP) event observed on 9 October 2021 by multiple spacecraft, including Solar Orbiter. The was associated with an M1.6 flare, a coronal mass ejection, and shock wave. During event, high-energy protons electrons were recorded instruments located within narrow longitudinal cone. Aims. An interesting aspect of multi-stage energisation during flare impulsive phase also what appears to be separate electron acceleration detected at Orbiter after...
ABSTRACT Interplanetary (IP) shocks are fundamental building blocks of the heliosphere, and possibility to observe them in situ is crucial address important aspects energy conversion for a variety astrophysical systems. Steepened waves known as shocklets be structures planetary bow shocks, but they very rarely observed related IP shocks. We present here first multi-spacecraft observations by upstream an unusually strong shock on 3 November 2021 several spacecraft at L1 near-Earth solar wind....
Abstract We analyze 65–105 keV electrons in the 7 February 2010 solar electron event observed simultaneously by STEREO‐A, STEREO‐B, and ACE. A method to reconstruct full‐electron pitch angle distributions from four Solar Electron Proton Telescope sensors on STEREO‐A/B instrument ACE energy range of approximately 60–300 for periods incomplete angular coverage is presented. transport modeling based numerical solutions a three‐dimensional particle propagation model which includes scattering...
Spacecraft missions provide the unique opportunity to study properties of collisionless shocks utilising in situ measurements. In past years, several diagnostics have been developed address key shock parameters using time series magnetic field (and plasma) data collected by a single spacecraft crossing front. A critical aspect such is averaging process involved evaluation upstream/downstream quantities. this work, we discuss these techniques, with particular focus on obliquity (defined as...
Abstract We present simulation results of a gradual solar energetic particle (SEP) event detected on 2021 October 9 by multiple spacecraft, including BepiColombo (Bepi) and near-Earth spacecraft such as the Advanced Composition Explorer (ACE). A peculiarity this is that presence high-speed stream (HSS) affected low-energy ion component (≲5 MeV) SEP at both Bepi ACE, despite HSS having only modest wind speed increase. Using EUHFORIA (European Heliospheric FORecasting Information Asset)...
Abstract Collisionless shock waves, ubiquitous in the Universe, are crucial for particle acceleration various astrophysical systems. Currently, heliosphere is only natural environment available their situ study. In this work, we showcase collective of electrons and ions by one fastest shocks ever recorded, observed pioneering Parker Solar Probe at 34.5 million km from Sun. Our analysis unprecedented, near-parallel shows electron up to 6 MeV amidst intense multiscale electromagnetic wave...