A5025330841- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Gamma-ray bursts and supernovae
- Solar Radiation and Photovoltaics
- Earthquake Detection and Analysis
- Stellar, planetary, and galactic studies
- Geomagnetism and Paleomagnetism Studies
- Atmospheric Ozone and Climate
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- Quantum, superfluid, helium dynamics
- Radiation Therapy and Dosimetry
- Spacecraft and Cryogenic Technologies
- Nuclear Physics and Applications
- Spacecraft Design and Technology
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Dark Matter and Cosmic Phenomena
- Plasma Diagnostics and Applications
- earthquake and tectonic studies
- Planetary Science and Exploration
- Physics of Superconductivity and Magnetism
- Atomic and Molecular Physics
- Photocathodes and Microchannel Plates
Southwest Research Institute
2020-2025
Kiel University
2020-2023
Universidad de Alcalá
2023
Johns Hopkins University Applied Physics Laboratory
2023
Universitat de Barcelona
2023
Peking University
2023
University of Pavol Jozef Šafárik
2021
Max Planck Institute for Solar System Research
2011-2020
Max Planck Society
2009-2019
University of Göttingen
2015-2018
Solar Orbiter is the first space mission observing solar plasma both in situ and remotely, from a close distance, out of ecliptic. The ultimate goal to understand how Sun produces controls heliosphere, filling System driving planetary environments. With six remote-sensing four in-situ instrument suites, coordination planning operations are essential address following top-level science questions: (1) What drives wind where does coronal magnetic field originate? (2) How do transients drive...
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...
Corotating Interaction Regions (CIRs) are recurring structures in the solar wind, characterized by interactions between fast and slow wind streams that compress heat plasma. This study investigates polytropic behavior of distinct regions around CIRs: uncompressed compressed wind. Using Wind spacecraft data an established methodology for calculating index ({\gamma}), we analyze 117 CIR events. Results indicate varying {\gamma} values across regions, with heating observed driven Alfv\'en wave...
[1] In 2007 during the declining phase of solar cycle energetic upstream ion events occurred mainly after a corotating interaction region passed Earth's magnetosphere. We study relation between these observed from about 70 to 1750 RE away Earth and observations in vicinity terrestrial bow shock (up 30 RE). For this purpose, simultaneous measurements ions STEREO A B (far region) Cluster Geotail (near shock) are used. all cases far associated with near shock. The simultaneously when magnetic...
We studied the source regions of 12 solar energetic particle (SEP) events seen between 2010 August and 2012 January at STEREO-A, B, and/or Earth (Advanced Composition Explorer/Solar Heliospheric Observatory/GOES), when two STEREO spacecraft were separated by about 180°. All associated with flares (C1 to X6) fast coronal mass ejections and, except for one, accompanied type II radio bursts. have determined arrival times SEPs three positions. Extreme ultraviolet (EUV) waves, observed in 195 Å...
Solar jets are fast-moving, elongated brightenings related to ejections seen in both images and spectra on all scales from barely visible chromospheric coronal extending up a few solar radii. The largest, most powerful the source of type III radio bursts, energetic electrons ions with greatly enhanced $^3$He heavy element abundances. frequent polar equatorial holes may contribute wind. primary acceleration mechanism for is believed be release magnetic stress via reconnection; however energy...
Solar energetic particles (SEPs) associated with shocks driven by fast coronal mass ejections (CMEs) or developed corotating interaction regions (CIRs) often extend to high energies, and are thus key elements of space weather. The PUNCH mission, set be launched in 2025, is equipped a photometric instrument that enables 3D tracking solar wind structures the interplanetary through polarized light. Tracking techniques used estimate speeds speed gradients structures, including jumps at shocks....
Abstract We examine 3 He-rich solar energetic particles (SEPs) detected on 2023 October 24–25 by Solar Orbiter at 0.47 au. Measurements reveal that heavy-ion enhancements increase irregularly with mass, peaking S. C, and especially N, Si, S, stand out in the enhancement pattern large abundances. Except for He, spectra can only be measured below 0.5 MeV nucleon −1 . At 0.386 , event shows a huge He/ 4 He ratio of 75.2 ± 33.9, larger than previously observed. Dynamics Observatory...
Solar energetic particle (SEP) events with compositional anomalies such as the highly elevated 3He/4He ratio have been known for more than half a century, but their origin is still not well-understood.  This largely because of difficulty identifying solar sources. In cycle 23, thanks to availability high-resolution coronal images from SOHO and other missions, jets were found be typical manifestation 3He-rich SEP observed by ACE Wind. They often temporally correlated type III radio...
We examine 3He-rich solar energetic particles (SEPs) detected on 2023 October 24-25 by Solar Orbiter at 0.47 au. The measurements revealed heavy-ion enhancement not increasing smoothly with mass. C, and especially N, Si, S, stand out in the pattern large abundances. Except for 3He, heavy ion spectra can only be measured below 0.5 MeV/nucleon. At 0.386 MeV/nucleon, event showed a huge 3He/4He ratio of 75.2±33.9, larger than ever previously observed. Dynamics Observatory extreme...
Context. Impulsive solar energetic particle events in the inner heliosphere show long-lasting enrichment of 3He. Aims. We study source regions 3He-rich (SEP) Methods. located responsible open magnetic field regions, we combined potential surface extrapolations (PFSS) with Parker spiral, and compared identified situ fields. The candidate are active region plages. activity was examined by using extreme ultraviolet (EUV) images from Solar Dynamics Observatory (SDO) STEREO together radio...
Abstract The Integrated Science Investigation of the Sun (IS⊙IS) instrument suite on Parker Solar Probe ( PSP ) spacecraft is making in situ observations energetic ions and electrons closer to than any previous mission. Using data collected during its first two orbits, which reached perihelion distances 0.17 au, we have searched for <?CDATA ${}^{3}\mathrm{He}$?> -rich solar particle (SEP) events under very quiet minimum conditions. On 2019-110–111 (April 20–21), SEPs were observed at...
We study the relationship between large gradual solar energetic particle (SEP) events and associated extreme-ultraviolet (EUV) wave properties in 16 that occurred 2010 August 2013 May were observed by SDO, Solar Heliospheric Observatory (SOHO), and/or STEREO. determine onset times, peak fluxes of SEP SOHO/ERNE STEREO/LET proton channels (6–10 MeV). The EUV arrival times their speeds from source sites to spacecraft footpoints photosphere, which are magnetically connected Parker spiral...
We study the origin of 3He-rich solar energetic particles (<1 MeV/nucleon) that are observed consecutively on STEREO-B, ACE, and STEREO-A spacecraft when they separated in heliolongitude by more than 90{\deg}. The period STEREO-B commences 2011 July 1 16, respectively. ACE consists two sub-events starting 7 9. associate events with same sizeable active region producing X-ray flares accompanied prompt electron events, it was near west limb as seen from respective spacecraft. 9 16 were...
Abstract Particle acceleration in stellar flares is ubiquitous the universe; however, our Sun only astrophysical object where energetic particles and their source can both be observed. The mechanism solar flares, tremendously enhancing (up to a factor of 10,000) rare elements like 3 He ultra-heavy nuclei, has been puzzling for almost 50 years. Here we present some most intense He- Fe-rich particle events ever reported. were accompanied by nonrelativistic electron type-III radio bursts....
Context. Solar Orbiter, launched in February 2020, started its cruise phase June coincidence with first perihelion at 0.51 au from the Sun. The situ instruments onboard, including Energetic Particle Detector (EPD), operate continuously during enabling observation of solar energetic particles. Aims. In measurements near-relativistic electron events observed July 2020 by EPD are analyzed and origins conditions for interplanetary transport these particles investigated. Methods. Electron...
Abstract We present Solar Orbiter energetic particle observations of two 3 He-rich events with features more clearly observed than in prior studies. The event 2022 November 9 from 0.59 au contained hundreds ultraheavy (UH; mass >78 amu) ions whereas previous at 1 have shown only an occasional count or two. 2023 April 8 0.29 fortuitously had very low ambient activity, making it possible to observe spectra the He acceleration mechanism without contamination, revealing extremely H and 4...
During the 2007 and 2008 solar minimum period, STEREO, Wind, ACE observed numerous Corotating Interaction Regions (CIRs) over spatial separations that began with all spacecraft close to Earth, through STEREO separation angles of ∼ 80 degrees in fall 2008. Over 35 CIR events were sufficient intensity allow measurement He heavy ion spectra using IMPACT/SIT, EPACT/STEP ACE/ULEIS instruments on ACE, respectively. In addition differences between expected basis simple corotation, we several where...
Abstract 3 He-rich solar energetic particles (SEPs) are believed to be accelerated in flares or jets by a mechanism that depends on the ion charge-to-mass ( Q / M ) ratio. It implies flare plasma characteristics (e.g., temperature) may effective determining elemental abundances of SEPs. This study examines relation between suprathermal (≲0.2 MeV nucleon −1 He–Fe ions measured Advanced Composition Explorer and temperature sources for 24 SEP events period 2010–2015. The differential emission...
We report observations of five impulsive solar energetic particle (SEP) events observed inside 1 au during the first perihelion pass Solar Orbiter mission, which was launched in February 2020. These small were all reasonably associated with active regions from Earth but had rotated out view by time observations. Even though most small, their spectral forms, 3 He content, and association type III bursts convincingly identifies them as He-rich SEP properties similar to those previously at au....