A5078840323- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Solar Radiation and Photovoltaics
- Ionosphere and magnetosphere dynamics
- Market Dynamics and Volatility
- Atmospheric Ozone and Climate
- Geomagnetism and Paleomagnetism Studies
- Dark Matter and Cosmic Phenomena
- Granular flow and fluidized beds
- GNSS positioning and interference
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Stellar, planetary, and galactic studies
- Advanced Thermodynamics and Statistical Mechanics
- Planetary Science and Exploration
The University of Texas at San Antonio
2021-2024
Southwest Research Institute
2021-2024
Abstract The Sun continuously affects the interplanetary environment through a host of interconnected and dynamic physical processes. Solar flares, Coronal Mass Ejections (CMEs), Energetic Particles (SEPs) are among key drivers space weather in near‐Earth beyond. While some CMEs flares associated with intense SEPs, show little to no SEP association. To date, robust long‐term (hours‐days) forecasting occurrence properties (e.g., onset, peak intensities) does not effectively exist search for...
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...
Abstract 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 around CIRs: uncompressed compressed wind. Using Wind spacecraft data an established methodology for calculating index ( γ ), we analyze 117 CIR events. Results indicate varying values across regions, with heating observed driven Alfvén wave dissipation...
We report Solar Orbiter observations of six recurrent solar energetic particle injections in 2022 March 3−6 at ∼0.5 au. All but one were associated with jets emanating from a plage near large sunspot active region 12 957. saw high 3 He and Fe enrichments minor no or lower enrichments. Furthermore, the event highest enrichment showed more compact configuration underlying photospheric magnetic field. The higher fluences as well harder spectra seen simultaneous jet wider eruption. However, this...
Abstract Solar Energetic Particles (SEPs) form a critical component of Space Weather. The complex, intertwined dynamics SEP sources, acceleration, and transport make their forecasting very challenging. Yet, information about arrival properties (e.g., peak flux) is crucial for space exploration on many fronts. We have recently introduced novel probabilistic ensemble model called the Multivariate Ensemble Models Probabilistic Forecast (MEMPSEP). Its primary aim to forecast occurrence physical...
Abstract We introduce a new multivariate data set that utilizes multiple spacecraft collecting in‐situ and remote sensing heliospheric measurements shown to be linked physical processes responsible for generating solar energetic particles (SEPs). Using the Geostationary Operational Environmental Satellites (GOES) flare event list from Solar Cycle (SC) 23 part of SC 24 (1998–2013), we identify 252 events ( > C‐class flares) produce SEPs 17,542 do not. For each identified event, acquire...
Abstract We analyze the spectral properties of 3 He and 4 as well heavy ions (oxygen, neon, magnesium, silicon, iron) in 80 He-rich solar energetic particle (SEP) events observed by Ultra-Low-Energy Ion Spectrometer on board Advanced Composition Explorer spacecraft since its launch 1997 until 2024. split analysis into two criteria: with fast wide coronal mass ejections (CMEs; called “FW events”) slow, narrow, or no CMEs (called “non-FW events”). Overall, we find that exhibit more uniform...
Abstract Using ion measurements from Ultra-Low-Energy Isotope Spectrometer observations on board Advanced Composition Explorer and Solar the Terrestrial Observatory (STEREO)-A STEREO-B spacecraft, we have identified 854 3 He-rich time periods between 1997 September 2021 March. We include all event types with observed He enhancements such as corotating interaction regions, gradual solar energetic particle (SEP) events, interplanetary shocks, impulsive SEP events. employ two different mass...
Inside the magnetosheath, IBEX-Hi energetic neutral atom (ENA) imager measures a distinct background count rate that is more than 10 times typical heliospheric ENA emissions observed when IBEX outside magnetosheath. The source of this enhancement magnetosheath ions solar wind (SW) origin deflect around Earth's magnetopause (MP), scatter and neutralize from anti-sunward part sunshade, continue into instrument as atoms, behaving indistinguishably ENAs emitted distant plasma sources. While...
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 1997-2021. In seven events, was due to leftover from preceding or independent occurring during events. One event is most likely impulsive (3He-rich), and another unclear. Reaccelerated remnant flare material probable cause enhancements remaining 14 Imaging observations showed coronal jets parent active regions six these Remarkably,...
Whitepaper #228 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research. Additional fundamental space plasma theory; solar physics; space-based missions/projects.
Abstract The radial evolution of particles accelerated at corotating interaction regions (CIRs) is not fully understood, particularly the distance range over which this particle acceleration occurs and how energy spectra are modulated by transport through inner heliosphere. Here, we present observations energetic proton enhancements associated with a CIR observed Parker Solar Probe on 2021 April 25 during inbound leg its orbit near ∼46 R s (∼0.21 au). identified additional spacecraft (Solar...
We report Solar Orbiter observations of six recurrent solar energetic particle injections in 2022 March 3–6 at ~0.5 au. The were associated with jets emanating from a plage near large sunspot NOAA active region 12957. saw high 3He and Fe enrichments minor no or lower enrichments. Furthermore, the event highest enrichment showed more compact configuration underlying photospheric magnetic field. higher fluences as well harder spectra seen wider jet-like eruption. However, this case,...
The origins and acceleration mechanisms of Impulsive Solar Energetic Particle (ISEP) events remain unanswered, yet they undoubtedly play a role in space weather may also be involved coronal heating.To understand ISEP events, it is imperative that the community continues to develop innovative observational techniques will uniquely measure key heliospheric parameters.This white paper details state-of-the-art science technology field date, highlights incomplete research areas regarding lists...
<p>Suprathermal ions from coronal jets, characterized by enhanced <sup>3</sup>He and heavy-ion abundances, are an essential component of the seed population accelerated mass ejection (CME)-driven shocks in gradual solar energetic particle (GSEP) events. However, mechanisms through which CME-driven gain access to these suprathermal produce spectral abundance variations GSEP events remain largely unexplored. We study simultaneously measured on at least...