S. T. Lepri
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View article: Spatial Variability and Correlation Lengths Within Stream Interaction Regions at 1 au: Comparison Between ACE and Wind
Spatial Variability and Correlation Lengths Within Stream Interaction Regions at 1 au: Comparison Between ACE and Wind Open
Understanding the spatial variability and correlation lengths throughout Stream Interaction Regions (SIRs) has importance both for fundamentally understanding the structuring of the solar wind and SIRs and for space weather operations. SIR…
View article: Geoeffectivity of Solar Wind Heavy Ions
Geoeffectivity of Solar Wind Heavy Ions Open
The influence of solar wind properties, such as the southward interplanetary magnetic field, on geomagnetic activity has been well established. However, the role of heavy ions (i.e., particles heavier than protons) in the solar wind on geo…
View article: Spatial Variability and Correlation Lengths within Stream Interaction Regions at 1 au: Comparison between ACE and Wind
Spatial Variability and Correlation Lengths within Stream Interaction Regions at 1 au: Comparison between ACE and Wind Open
View article: Observational Constraints on the Radial Evolution of O<sup>6+</sup> Temperature and Differential Flow in the Inner Heliosphere
Observational Constraints on the Radial Evolution of O<sup>6+</sup> Temperature and Differential Flow in the Inner Heliosphere Open
Over decades of solar wind observations, heavy ions have been observed to have a higher temperature and flow faster than protons in the solar corona and heliosphere. Remote observations have largely been limited to the low corona ( 2) have…
View article: Connecting Solar Orbiter and L1 Measurements of Mesoscale Solar Wind Structures to Their Coronal Source Using the ADAPT-WSA Model
Connecting Solar Orbiter and L1 Measurements of Mesoscale Solar Wind Structures to Their Coronal Source Using the ADAPT-WSA Model Open
Much of the dynamics of the ambient solar wind (SW) manifests at mesoscales—scales larger than kinetic but smaller than global structures. Mesoscale structures often form at the Sun, survive to 1 au, and are geoeffective. Identifying their…
View article: A 3D Nonequilibrium Ionization Model of a Shock Wave in the Low Corona. I. Extreme-ultraviolet Emission and Inefficient Electron Heating
A 3D Nonequilibrium Ionization Model of a Shock Wave in the Low Corona. I. Extreme-ultraviolet Emission and Inefficient Electron Heating Open
Shocks in the low corona are best observed in the extreme ultraviolet (EUV); however, time-dependent ionization in the postshock region is generally incompatible with the otherwise straightforward plasma diagnostics typically applied to EU…
View article: Solar Wind Heavy Ions and Alpha Particles Within Earth's Magnetosphere and Their Variability With Upstream Conditions
Solar Wind Heavy Ions and Alpha Particles Within Earth's Magnetosphere and Their Variability With Upstream Conditions Open
Working toward the goal of understanding solar wind (SW) entry to the Earth's magnetosphere, this study examines solar‐origin ion composition in the magnetotail. During its trajectory, Wind spent a significant amount of time in the Earth's…
View article: SunRISE Ground Radio Lab: Monitoring Solar Radio Bursts With an Expansive Array of Antennae at High Schools Nationwide
SunRISE Ground Radio Lab: Monitoring Solar Radio Bursts With an Expansive Array of Antennae at High Schools Nationwide Open
The Sun Radio Interferometer Space Experiment (SunRISE) Ground Radio Lab (GRL) is a Science, Technology, Engineering, Arts, and Mathematics (STEAM) project, sponsored by NASA's SunRISE mission and organized by the University of Michigan Co…
View article: Heavy ion abundances evolve with solar activity
Heavy ion abundances evolve with solar activity Open
Context. When observed at 1 AU, solar wind traveling at slow speeds ( v sw ≲ 500 km s −1 ) is typically considered to have originated in source regions with magnetic topologies that are intermittently open to the heliosphere. Solar wind wi…
View article: Empirical Functions for Highly Charged Ion Abundances in Solar Wind Charge Exchange Models: Addressing Post‐2011 ACE Data Limitations
Empirical Functions for Highly Charged Ion Abundances in Solar Wind Charge Exchange Models: Addressing Post‐2011 ACE Data Limitations Open
Upcoming imaging missions—NASA's LEXI and ESA/CAS's SMILE—will target solar wind charge exchange X‐ray (SWCX) emission from Earth's magnetosheath. This emission is generated by highly charged ions colliding with neutrals in Earth's exosphe…
View article: Differentiating the Acceleration Mechanisms in the Slow and Alfvénic Slow Solar Wind
Differentiating the Acceleration Mechanisms in the Slow and Alfvénic Slow Solar Wind Open
In the corona, plasma is accelerated to hundreds of kilometers per second and heated to temperatures hundreds of times hotter than the Sun's surface before it escapes to form the solar wind. Decades of space-based experiments have shown th…
View article: Differentiating the acceleration mechanisms in the slow and Alfvénic slow solar wind
Differentiating the acceleration mechanisms in the slow and Alfvénic slow solar wind Open
In the corona, plasma is accelerated to hundreds of kilometers per second, and heated to temperatures hundreds of times hotter than the Sun's surface, before it escapes to form the solar wind. Decades of space-based experiments have shown …
View article: The transition from slow to fast wind as observed in composition observations
The transition from slow to fast wind as observed in composition observations Open
Context. The solar wind is typically categorized as fast and slow based on the measured speed ( v sw ). The separation between these two regimes is often set between 400 and 600 km s −1 without a rigorous definition. Observations with v sw…
View article: Can XMM‐Newton Be Used to Track Compositional Changes in the Solar Wind?
Can XMM‐Newton Be Used to Track Compositional Changes in the Solar Wind? Open
Geocoronal Solar Wind Charge Exchange (SWCX) is the process by which heavy ions from the solar wind undergo charge exchange with neutral hydrogen atoms from the Earth's exosphere, releasing photons at discrete energies characteristic of th…
View article: The solar wind heavy ion composition in the ascending phases of the solar cycles 23 and 25
The solar wind heavy ion composition in the ascending phases of the solar cycles 23 and 25 Open
The approximately 11-year solar cycle has been shown to impact the heavy ion composition of the solar wind, even when accounting for streams of differing speeds; however, the heavy ion composition observed between the same specific phases …
View article: Mixed Source Region Signatures inside Magnetic Switchback Patches Inferred by Heavy Ion Diagnostics
Mixed Source Region Signatures inside Magnetic Switchback Patches Inferred by Heavy Ion Diagnostics Open
Since Parker Solar Probe’s (Parker’s) first perihelion pass at the Sun, large-amplitude Alfvén waves grouped in patches have been observed near the Sun throughout the mission. Several formation processes for these magnetic switchback patch…
View article: Determining the Interstellar Wind Longitudinal Inflow Evolution Using Pickup Ions in the Helium Focusing Cone
Determining the Interstellar Wind Longitudinal Inflow Evolution Using Pickup Ions in the Helium Focusing Cone Open
The size, shape, and composition of the heliosphere are affected by its interaction with the local interstellar medium. A means of quantifying this interaction is by measuring the relative motion of the two media. We determine the flow dir…
View article: SunRISE Ground Radio Lab
SunRISE Ground Radio Lab Open
View article: Mixed Source Region Signatures Inside Magnetic Switchback Patches Inferred by Heavy Ion Diagnostics
Mixed Source Region Signatures Inside Magnetic Switchback Patches Inferred by Heavy Ion Diagnostics Open
Since Parker Solar Probe's (Parker's) first perihelion pass at the Sun, large amplitude Alfvén waves grouped in patches have been observed near the Sun throughout the mission. Several formation processes for these magnetic switchback patch…
View article: In situ observations of large-amplitude Alfvén waves heating and accelerating the solar wind
In situ observations of large-amplitude Alfvén waves heating and accelerating the solar wind Open
After leaving the Sun’s corona, the solar wind continues to accelerate and cools, but more slowly than expected for a freely expanding adiabatic gas. Alfvén waves are perturbations of the interplanetary magnetic field that transport energy…
View article: Compositional Metrics of Fast and Slow Alfvénic Solar Wind Emerging from Coronal Holes and Their Boundaries
Compositional Metrics of Fast and Slow Alfvénic Solar Wind Emerging from Coronal Holes and Their Boundaries Open
We seek to understand the composition and variability of fast solar wind (FSW) and slow Alfvénic solar wind emerging from coronal holes (CHs). We leverage an opportune conjunction between Solar Orbiter and Parker Solar Probe (PSP) during P…
View article: Observations of Suprathermal Ions(5-75 keV) in Association with Shocks
Observations of Suprathermal Ions(5-75 keV) in Association with Shocks Open
The Heavy Ion Instrument (HIS) onboard Solar Orbiter measures mass, charge, and full 3-D velocities of ions in the energy/charge range 0.5-75keV/charge. Using the data from HIS we study how interplanetary events like shocks or CME fronts c…
View article: Inter-Calibration of Solar Orbiter&#8217;s Heavy Ion Sensor and Suprathermal Ion Spectrograph
Inter-Calibration of Solar Orbiter’s Heavy Ion Sensor and Suprathermal Ion Spectrograph Open
The distribution of charged particles in the heliosphere covers more than 16 orders of magnitude in particle flux and more than 6 orders of magnitude in energy. While the majority of these particles are ionized hydrogen (protons) and fully…
View article: Zone of Preferential Heating for Minor Ions in the Solar Wind
Zone of Preferential Heating for Minor Ions in the Solar Wind Open
The properties of minor ions in the solar wind are important indicators of the state of the solar corona and the heating processes it undergoes as it expands. Evidence of preferential heating of minor ions has been observed in the solar wi…
View article: Complementary interstellar detections from the heliotail
Complementary interstellar detections from the heliotail Open
The heliosphere is a protective shield around the solar system created by the Sun’s interaction with the local interstellar medium (LISM) through the solar wind, transients, and interplanetary magnetic field. The shape of the heliosphere i…
View article: Skewness and kurtosis of solar wind proton distribution functions: The normal inverse-Gaussian model and its implications
Skewness and kurtosis of solar wind proton distribution functions: The normal inverse-Gaussian model and its implications Open
Context. In the solar wind (SW), the particle distribution functions are generally not Gaussian. They present nonthermal features that are related to underlying acceleration and heating processes. These processes are critical in the overal…
View article: Compositional metrics of fast and slow Alfvenic solar wind emerging from coronal holes and their boundaries
Compositional metrics of fast and slow Alfvenic solar wind emerging from coronal holes and their boundaries Open
We seek to understand the composition and variability of fast (FSW) and slow Alfvenic solar wind (SASW) emerging from coronal holes (CH). We leverage an opportune conjunction between Solar Orbiter and Parker Solar Probe (PSP) during PSP En…
View article: 3D MHD Time-dependent Charge State Ionization and Recombination Modeling of the Bastille Day Coronal Mass Ejection
3D MHD Time-dependent Charge State Ionization and Recombination Modeling of the Bastille Day Coronal Mass Ejection Open
Heavy ion signatures of coronal mass ejections (CMEs) indicate that rapid and strong heating takes place during the eruption and early stages of propagation. However, the nature of the heating that produces the highly ionized charge states…
View article: An Inclusive Heliophysics Community
An Inclusive Heliophysics Community Open
Whitepaper #150 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: infrastructure/workforce/other programmatic. Additional topics: other programmatic; state of the profession.
View article: Firefly: The Case for a Holistic Understanding of the Global Structure and Dynamics of the Sun and the Heliosphere
Firefly: The Case for a Holistic Understanding of the Global Structure and Dynamics of the Sun and the Heliosphere Open
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