112 citations · 573 across the 27 of their papers we have counts for
27 papers
Solar Orbiter SEP Dropout during a Magnetic Cloud with Evidence for Strong Connectivity Gradients
Radoslav Bucik, Raul Gomez-Herrero, Samuel T. Hart +2
We analyze an impulsive solar energetic particle (SEP) event observed by Solar Orbiter at 0.93 au on 2022 December 24 that exhibits a pronounced intensity dropout between approxima…
Helium-3 Enrichment in Gradual Solar Energetic Particle Events: Evidence for Jet-Supplied Seed Population
R. Bucik, S. T. Hart, M. A. Dayeh +3
Enhancements in 3He abundance, a characteristic feature of impulsive solar energetic particle (ISEP) events, are also frequently observed in gradual SEP (GSEP) events. Understandin…
Origin of Unusual Composition of 3He-Rich Solar Energetic Particles
R. Bucik, G. M. Mason, S. M. Mulay +3
We examine 3He-rich solar energetic particles (SEPs) detected on 2023 October 24-25 by Solar Orbiter at 0.47 au. The measurements revealed that heavy-ion enhancements increase irre…
Polytropic Behavior in Corotating Interaction Regions: Evidence of Alfvénic Heating
M. A. Dayeh, M. J. Starkey, G. Livadiotis +5
Corotating Interaction Regions (CIRs) are recurring structures in the solar wind, characterized by interactions between fast and slow solar wind streams that compress and heat plas…
Origin of 3He abundance enhancements in gradual solar energetic particle events
Radoslav Bucik, Samuel T. Hart, Maher A. Dayeh +3
We examined the origin of 3He abundance enhancement in 23 high-energy (25-50 MeV) solar proton events that coincide with 3He-rich periods detected by ACE ULEIS in 1997-2021. In sev…
Statistical Study and Live Catalogue of Multi-Spacecraft 3He-Rich Time Periods over Solar Cycles 23, 24, and 25
Samuel T. Hart, Maher A. Dayeh, Radoslav Bučík +5
Using ion measurements from Ultra-Low-Energy Isotope Spectrometer (ULEIS) observations onboard Advanced Composition Explorer (ACE) and Solar Isotope Spectrometer (SIS) observations…
Impulsive Solar Energetic Particle Events: EUV Waves and Jets
R. Bucik
Impulsive solar energetic particle (ISEP) events show peculiar elemental composition, with enhanced 3He and heavy-ion abundances, markedly different from our solar system compositi…
The Long Period of 3He-rich Solar Energetic Particles Measured by Solar Orbiter on 2020 November 17-23
R. Bucik, G. M. Mason, R. Gomez-Herrero +31
We report observations of a relatively long period of 3He-rich solar energetic particles (SEPs) measured by Solar Orbiter. The period consists of several well-resolved ion injectio…
Temperature in Solar Sources of 3He-rich Solar Energetic Particles and Relation to Ion Abundances
R. Bucik, S. M. Mulay, G. M. Mason +3
3He-rich solar energetic particles (SEPs) are believed to be accelerated in solar flares or jets by a mechanism that depends on the ion charge-to-mass (Q/M) ratio. It implies that…
The Solar Orbiter Science Activity Plan: translating solar and heliospheric physics questions into action
I. Zouganelis, A. De Groof, A. P. Walsh +182
Solar Orbiter is the first space mission observing the solar plasma both in situ and remotely, from a close distance, in and out of the ecliptic. The ultimate goal is to understand…
3He-rich solar energetic particles: Solar sources
R. Bucik
3He-rich solar energetic particles (SEPs), showing up to a 10,000-fold abundance enhancement of rare elements like 3He or ultra-heavy nuclei, have been a puzzle for more than 50 ye…
3He-Rich Solar Energetic Particles from Sunspot Jets
R. Bucik, M. E. Wiedenbeck, G. M. Mason +3
Solar sources of suprathermal (<1 MeV/nucleon) 3He-rich solar energetic particles (SEPs) have been commonly associated with jets originating in small, compact active regions at the…
Spectroscopic EUV observations of impulsive solar energetic particle event sources
R. Bucik, A. Fludra, R. Gomez-Herrero +4
Context. The remote observations of solar flare ion acceleration are rather limited. There are theoretical predictions for signatures of ion acceleration in EUV line profiles. Prev…
3He-Rich Solar Energetic Particles in Helical Jets on the Sun
Radoslav Bucik, Davina E. Innes, Glenn M. Mason +3
Particle acceleration in stellar flares is ubiquitous in the Universe, however, our Sun is the only astrophysical object where energetic particles and their source flares can both…
Energy spectra of 3He-rich solar energetic particles associated with coronal waves
R. Bucik, D. E. Innes, G. M. Mason +1
In addition to their anomalous abundances, 3He-rich solar energetic particles (SEPs) show puzzling energy spectral shapes varying from rounded forms to power laws where the later a…
Association of 3He-Rich Solar Energetic Particles with Large-Scale Coronal Waves
Radoslav Bucik, Davina E. Innes, Glenn M. Mason +1
Small 3He-rich solar energetic particle (SEP) events have been commonly associated with extreme-ultraviolet (EUV) jets and narrow coronal mass ejections (CMEs) which are believed t…
Observations of solar X-ray and EUV jets and their related phenomena
Davina Innes, Radoslav Bucik, Li-Jia Guo +1
Solar jets are fast-moving, elongated brightenings related to ejections seen in both images and spectra on all scales from barely visible chromospheric jets to coronal jets extendi…
Observations of EUV Waves in 3He-Rich Solar Energetic Particle Events
R. Bucik, D. E. Innes, L. Guo +2
Small 3He-rich solar energetic particle (SEP) events with their anomalous abundances, markedly different from solar system, provide evidence for a unique acceleration mechanism tha…
Long-lived energetic particle source regions on the Sun
R. Bucik, D. E. Innes, N. -H. Chen +3
Discovered more than 40 years ago, impulsive solar energetic particle (SEP) events are still poorly understood. The enormous abundance enhancement of the rare 3He isotope is the mo…
Case studies of multi-day 3He-rich solar energetic particle periods
Nai-hwa Chen, Radoslav. Bucik, Davina. E. Innes +1
Context. Impulsive solar energetic particle events in the inner heliosphere show the long-lasting enrichment of 3He. Aims. We study the source regions of long-lasting 3He-rich sola…
Multi-Spacecraft Observations of Recurrent 3He-Rich Solar Energetic Particles
R. Bucik, D. E. Innes, U. Mall +3
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 are separated in heli…
Abundances of Suprathermal Heavy Ions in CIRs on STEREO during the Minimum of Solar Cycle 23
R. Bucik, U. Mall, A. Korth +1
We examine the composition of the 0.1 - 1 MeV/n interplanetary heavy ions from H to Fe in corotating interaction regions (CIRs) measured by the SIT (Suprathermal Ion Telescope) ins…
Simulation of a Time-Of-Flight Telescope for Suprathermal Ions in the Heliosphere
R. Bucik, A. Korth, U. Mall +1
A Monte Carlo code based on Geant 3.21 has been used for simulations of energy losses and angular scattering in a time-of-flight Suprathermal Ion Telescope (SIT) on the Solar-Terre…
STEREO observations of the energetic ions in tilted corotating interaction regions
R. Bucik, U. Mall, A. Korth +1
In this paper we examine suprathermal He ions measured by the SIT (Suprathermal Ion Telescope) instrument associated with tilted corotating interaction regions (CIRs). We use obser…