A5035475336- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Stellar, planetary, and galactic studies
- Geophysics and Gravity Measurements
- Solar Radiation and Photovoltaics
- Space exploration and regulation
- Planetary Science and Exploration
- Atmospheric Ozone and Climate
- Particle accelerators and beam dynamics
- Earthquake Detection and Analysis
- Gamma-ray bursts and supernovae
- Spacecraft Design and Technology
- Particle Accelerators and Free-Electron Lasers
- Geological and Geophysical Studies
- Muon and positron interactions and applications
- Economic Growth and Productivity
- Structural Analysis and Optimization
- Spacecraft and Cryogenic Technologies
- Oil, Gas, and Environmental Issues
- Astrophysics and Cosmic Phenomena
- Photovoltaic System Optimization Techniques
- Global Energy and Sustainability Research
- Space Science and Extraterrestrial Life
Predictive Science (United States)
2022-2025
Heliophysics
2023
Weatherford College
2023
University of California, Berkeley
2020-2022
University Corporation for Atmospheric Research
2021-2022
KBR (United States)
2022
University of Helsinki
2016-2021
Helsinki Art Museum
2019
Helsinki Institute of Physics
2016-2017
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...
Coronal mass ejections (CMEs) are the primary sources of intense disturbances at Earth, where their geo-effectiveness is largely determined by dynamic pressure and internal magnetic field, which can be significantly altered during interactions with other CMEs in interplanetary space. We analyse three successive that erupted from Sun September 4-6, 2017, investigating role CME-CME as source associated geomagnetic storm (Dst_min=-142 nT on 7). To quantify impact (geo-)effectiveness individual...
Solar Energetic Particle (SEP) events are interesting from a scientific perspective as they the product of broad set physical processes corona out through extent heliosphere, and provide insight into particle acceleration transport that widely applicable in astrophysics. From operations perspective, SEP pose radiation hazard for aviation, electronics space, human space exploration, particular missions outside Earth's protective magnetosphere including to Moon Mars. Thus, it is critical...
(Shortened version) Current efforts in space weather forecasting of CMEs have been focused on predicting their arrival time and magnetic structure. To make predictions, methods developed to derive the true CME speed, size position, among others. Difficulties determining input parameters for arise from lack direct measurements coronal fields uncertainties estimating 3D geometric kinematic parameters. White-light coronagraph images are usually employed by a variety reconstruction techniques....
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 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...
Abstract On 3 February 2022, SpaceX launched 49 Starlink satellites, 38 of which unexpectedly de‐orbited. Although this event was attributed to space weather, definitive causality remained elusive because weather conditions were not extreme. In study, we identify solar sources the interplanetary coronal mass ejections that responsible for geomagnetic storms around time launch satellites and first time, investigate their impact on Earth's magnetosphere using magnetohydrodynamic modeling. The...
Predicting the magnetic field within an Earth-directed coronal mass ejection (CME) well before its arrival at Earth is one of most important issues in space weather research. In this article, we compare intrinsic flux rope type, i.e. CME orientation and handedness during eruption, with situ type for 20 events that have been uniquely linked from Sun to through heliospheric imaging. Our study shows can be estimated CMEs originating different source regions using a combination indirect proxies....
Forecasting the geomagnetic effects of solar storms, known as coronal mass ejections (CMEs), is currently severely limited by our inability to predict magnetic field configuration in CME core and observational a single spacecraft trajectory through its 3D structure. flux ropes can lead continuous forcing energy input Earth's magnetosphere strong steady southward-pointing fields. Here, we demonstrate proof-of-concept way new approach southward Bz rope. It combines novel semi-empirical model...
Predictions of coronal mass ejections (CMEs) and solar energetic particles (SEPs) are a central issue in space weather forecasting. In recent years, interest predictions has expanded to include impacts at other planets beyond Earth as well spacecraft scattered throughout the heliosphere. this sense, scope science now encompasses whole heliospheric system, multi-point measurements transients can provide useful insights validations for prediction models. work, we aim analyse inner context...
Abstract Predicting the impacts of coronal mass ejections (CMEs) is a major focus current space weather forecasting efforts. Typically, CME properties are reconstructed from stereoscopic images and then used to forward model CME's interplanetary evolution. Knowing uncertainty in reconstructions critical factor determining any predictions. A growing number catalogs exist, but no extensive comparison between these has yet been performed. Here we develop Living List Attributes Measured Any...
Abstract. Planar magnetic structures (PMSs) are periods in the solar wind during which interplanetary field vectors nearly parallel to a single plane. One of specific regions where PMSs have been reported coronal mass ejection (CME)-driven sheaths. We use here an automated method identify 95 CME sheath observed situ by Wind and ACE spacecraft between 1997 2015. The occurrence location related various shock, sheath, properties. find that ubiquitous sheaths; 85 % studied had with mean duration...
The activity of the Sun alternates between a solar minimum and maximum, former corresponding to period "quieter" status heliosphere. During minimum, it is in principle more straightforward follow eruptive events wind structures from their birth at throughout interplanetary journey. In this paper, we report analysis origin, evolution, heliospheric impact series transient that took place during second half August 2018, i.e. midst late declining phase Solar Cycle 24. particular, focus on two...
The ISWAT (International Space Weather Action Teams) heliosphere clusters H1 and H2 have a focus on interplanetary space its characteristics, especially the large-scale co-rotating transient structures impacting Earth. Solar wind stream interaction regions, generated by between high-speed solar originating in open coronal magnetic fields slower from closed fields, are regions of compressed plasma field followed streams that recur at ∼27 day rotation period. Short-term reconfigurations lower...
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...
Abstract Coronal mass ejections (CMEs) drive space weather effects at Earth and the heliosphere. Predicting their arrival is a major part of forecasting. In 2013, Community Coordinated Modeling Center started collecting predictions from community, developing an Arrival Time Scoreboard (ATSB). Riley et al. (2018, https://doi.org/10.1029/2018sw001962 ) analyzed first 5 years ATSB, finding bias few hours uncertainty order 15 hr. These metrics have been routinely quoted since 2018, but not...
Multi-spacecraft observations of solar energetic particle (SEP) events not only enable a deeper understanding and development acceleration transport theories but also provide important constraints for model validation efforts. However, because computational limitations, given physics-based SEP is usually best suited to capture particular phase an event, rather than its whole from onset through decay. For example, magnetohydrodynamic (MHD) models the heliosphere often incorporate transients...
Abstract We report direct observations of a fast magnetosonic forward–reverse shock pair observed by Solar Orbiter on 2022 March 8 at the short heliocentric distance 0.5 au. The structure, sharing some features with fully-formed stream interaction regions, is due to between two successive coronal mass ejections (CMEs), never previously give rise pair. scenario supported remote from extreme ultraviolet cameras and coronagraphs, where candidate eruptions compatible in situ signatures have been...
Coronal pseudostreamer flux systems have a specific magnetic configuration that influences the morphology and evolution of coronal mass ejections (CMEs) from these regions. Here we continue analysis Wyper et al. (2024, ApJ 975, 168) magnetohydrodynamic simulation CME eruption an idealized through construction synthetic remote-sensing in-situ observational signatures. We examine pre-eruption signatures in extreme ultraviolet white-light low corona extended solar atmosphere. calculate...
On 13 March 2023, when the Parker Solar Probe was situated on far side of Sun as seen from Earth, a large solar eruption took place creating strong energetic particle (SEP) event observed by multiple spacecraft (S/C). The at six well-separated locations: Probe, Orbiter, BepiColombo, STEREO~A, near-Earth S/C, and MAVEN. An in-situ shock crossing related storm (ESP) were all inner-heliospheric suggesting that interplanetary coronal mass ejection (CME)-driven extended around Sun. However,...
On 13 March 2023, when the Parker Solar Probe spacecraft (S/C) was situated on far side of Sun as seen from Earth, a large solar eruption took place, which created strong energetic particle (SEP) event observed by multiple S/C all around Sun. The at six well-separated locations in heliosphere, provided Probe, Orbiter, BepiColombo, STEREO A, near-Earth S/C, and MAVEN Mars. Clear signatures an situ shock crossing related storm (ESP) were inner-heliospheric suggesting that interplanetary...
Fast coronal mass ejections (CMEs) drive the most severe geomagnetic storms. Forecasting their properties upstream of Earth has, in past, required sophisticated numerical models to be developed, run, and refined by experts. In this study, we present a new global MHD model for initiating following evolution CMEs from outer corona 1~AU. Based on successful astrophysical code, PLUTO, heliospheric (sunRunner3D) is easy install, set up, requiring relatively modest computer resources. To...