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View article: HiSAXy: A fast methodology for solar wind structure identification in millions of time series
HiSAXy: A fast methodology for solar wind structure identification in millions of time series Open
We present a hybridized unsupervised clustering algorithm Hisaxy as a novel way to identify frequently occurring magnetic structures embedded in the interplanetary magnetic field (IMF) carried by the solar wind. The Hisaxy algorithm utiliz…
View article: High-resolution Simulation of Coronal Mass Ejection–Corotating Interaction Region Interactions: Mesoscale Solar Wind Structure Formation Observable by the SWIFT Constellation
High-resolution Simulation of Coronal Mass Ejection–Corotating Interaction Region Interactions: Mesoscale Solar Wind Structure Formation Observable by the SWIFT Constellation Open
We present an unprecedented simulation of how two large-scale heliospheric transients—a coronal mass ejection (CME) and a corotating stream interaction region—collide, producing a dramatic increase in the complexity of the CME due to forma…
View article: Large-amplitude Whistler Precursors and >MeV Particles Observed at a Weak Interplanetary Shock by Parker Solar Probe
Large-amplitude Whistler Precursors and >MeV Particles Observed at a Weak Interplanetary Shock by Parker Solar Probe Open
We report observations of an interplanetary (IP) shock observed by Parker Solar Probe (PSP) on 2024 September 29 at ∼07:50:29 UTC. PSP was only ∼17.07 R s from the Sun, making this one of the closest observed IP shocks to date. The IP shoc…
View article: The Temperature Anisotropy and Helium Abundance Features of Alfvénic Slow Solar Wind Observed by Parker Solar Probe, Helios, and Wind Missions
The Temperature Anisotropy and Helium Abundance Features of Alfvénic Slow Solar Wind Observed by Parker Solar Probe, Helios, and Wind Missions Open
Slow solar wind is typically characterized as having low Alfvénicity, but the occasional occurrence of highly Alfvénic slow solar wind (HASSW) raises questions about its source regions and evolution. In this work, we conduct a statistical …
View article: Parker Solar Probe Observations of a Highly Energetic and Asymmetric Reconnecting Heliospheric Current Sheet during Encounter 13
Parker Solar Probe Observations of a Highly Energetic and Asymmetric Reconnecting Heliospheric Current Sheet during Encounter 13 Open
We report Parker Solar Probe observations of reconnection during an unusual heliospheric current sheet (HCS) crossing at 14.8 solar radii that occurred ∼15 hr after the passage of a CME. The HCS was surrounded by unusually low solar wind d…
View article: First Detection of Low-frequency Striae in Interplanetary Type III Radio Bursts
First Detection of Low-frequency Striae in Interplanetary Type III Radio Bursts Open
We report the first detection of type III solar radio burst striae in the 30–80 kHz range, observed by the Cluster-4 spacecraft during an exceptionally quiet solar period. These low-frequency fine structures, which drift slowly in frequenc…
View article: Diffusion-based size determination of solute particles: a method adapted for postsynaptic proteins
Diffusion-based size determination of solute particles: a method adapted for postsynaptic proteins Open
The postsynaptic density (PSD) is a complex, multi-layered protein network largely situated on the internal surface of the postsynaptic membrane. It is the first processing unit for incoming synaptic transmissions, and changes in its inter…
View article: Radial Evolution of Interplanetary Shock Properties with Heliospheric Distance: Observations from Parker Solar Probe
Radial Evolution of Interplanetary Shock Properties with Heliospheric Distance: Observations from Parker Solar Probe Open
We present a comprehensive analysis of 66 interplanetary shocks observed by the Parker Solar Probe between 2018 November and 2024 January. Among these, 33 events fulfilled the Rankine–Hugoniot (R-H) conditions, ensuring reliable asymptotic…
View article: The Solar Magnetic Hump, Heliopause, and the Very Local Interstellar Medium
The Solar Magnetic Hump, Heliopause, and the Very Local Interstellar Medium Open
The magnetic hump was observed from 2020.4 to ∼2022 by Burlaga et al. who offered the hypothesis that it originated at the Sun during the declining phase of the solar cycle. Voyager 1 observed intermittency of 1 hr increments of the magnet…
View article: The Incompressible Magnetohydrodynamic Energy Cascade Rate Upstream of Mars: Effects of the Total Energy and the Cross-helicity on Solar Wind Turbulence
The Incompressible Magnetohydrodynamic Energy Cascade Rate Upstream of Mars: Effects of the Total Energy and the Cross-helicity on Solar Wind Turbulence Open
Solar wind turbulence is a dynamical phenomenon that evolves with heliocentric distance. Orbiting Mars since 2014 September, Mars Atmosphere and Volatile EvolutioN offers a unique opportunity to explore some of its main properties beyond ∼…
View article: Multiple Subscale Magnetic Reconnection Embedded inside a Heliospheric Current Sheet Reconnection Exhaust: Evidence for Flux Rope Merging
Multiple Subscale Magnetic Reconnection Embedded inside a Heliospheric Current Sheet Reconnection Exhaust: Evidence for Flux Rope Merging Open
We report observations of multiple subscale reconnecting current sheets embedded inside a large-scale heliospheric current sheet (HCS) reconnection exhaust. The discovery was made possible by the unusual skimming trajectory of Parker Solar…
View article: Unveiling the Interplanetary Solar Radio Bursts of the 2024 Mother’s Day Solar Storm
Unveiling the Interplanetary Solar Radio Bursts of the 2024 Mother’s Day Solar Storm Open
We report on a comprehensive study of interplanetary type III radio bursts linked to X-class solar flares from NOAA active region 13664, which instigated the intense 2024 Mother’s Day solar storm, marked by a geomagnetic storm of −412 nT, …
View article: The Incompressible Magnetohydrodynamic Energy Cascade Rate Upstream of Mars: Effects of the Total Energy and the Cross-Helicity on Solar Wind Turbulence
The Incompressible Magnetohydrodynamic Energy Cascade Rate Upstream of Mars: Effects of the Total Energy and the Cross-Helicity on Solar Wind Turbulence Open
Solar wind turbulence is a dynamical phenomenon that evolves with heliocentric distance. Orbiting Mars since September 2014, Mars Atmosphere and Volatile EvolutioN (MAVEN) offers a unique opportunity to explore some of its main properties …
View article: Solar wind data analysis aided by synthetic modeling: A better understanding of plasma frame variations from temporal data
Solar wind data analysis aided by synthetic modeling: A better understanding of plasma frame variations from temporal data Open
Context. In situ measurements of the solar wind, a turbulent and anisotropic plasma flow originating at the Sun, are mostly carried out by single spacecraft, resulting in one-dimensional time series. Aims. The conversion of these measureme…
View article: Radial Variations in Solar Type III Radio Bursts
Radial Variations in Solar Type III Radio Bursts Open
Type III radio bursts are generated by electron beams accelerated at reconnection sites in the corona. This study, utilizing data from the Parker Solar Probe’s first 17 encounters, closely examines these bursts down to 13 solar radii. A fo…
View article: Solar wind data analysis aided by synthetic modeling: a better understanding of plasma-frame variations from temporal data
Solar wind data analysis aided by synthetic modeling: a better understanding of plasma-frame variations from temporal data Open
In-situ measurements of the solar wind, a turbulent and anisotropic plasma flow originating at the Sun, are mostly carried out by single spacecraft, resulting in one-dimensional time series. The conversion of these measurements to the spat…
View article: Erratum: “Parker Solar Probe Observations of High Plasma β Solar Wind from the Streamer Belt” (2023, ApJS, 265, 47)
Erratum: “Parker Solar Probe Observations of High Plasma β Solar Wind from the Streamer Belt” (2023, ApJS, 265, 47) Open
International audience
View article: Comprehensive Analysis of a Type III Radio Storm Using Multi-Spacecraft Observations
Comprehensive Analysis of a Type III Radio Storm Using Multi-Spacecraft Observations Open
Solar flares are often accompanied by intense radio emissions, particularly notable in the form of fast-drifting type III bursts. These bursts are generated by suprathermal electron beams that are accelerated at solar flare reconnection si…
View article: Intermittency in the Magnetic Hump in the VLISM
Intermittency in the Magnetic Hump in the VLISM Open
Voyager 1 has been moving through the very local interstellar medium (VLISM) for ∼1 solar cycle, from 122.58 au on 2012/DOY 238 (August 25) to 158.5 au on 2023.0. A magnetic hump was observed, beginning with an abrupt increase (jump) in th…
View article: Comparative Analysis of Type III Radio Bursts and Solar Flares: Spatial Localization and Correlation with Solar Flare Intensity
Comparative Analysis of Type III Radio Bursts and Solar Flares: Spatial Localization and Correlation with Solar Flare Intensity Open
We present a comprehensive study of type III radio bursts and their association with solar flares of magnitude M1.0 and larger, as observed by four widely separated spacecraft (Parker Solar Probe, Solar Orbiter, STEREO-A, and Wind). Our ma…
View article: Enhancing Triangulation of Interplanetary Type III Bursts through Wavevector Correction
Enhancing Triangulation of Interplanetary Type III Bursts through Wavevector Correction Open
Interplanetary Type III bursts, generated by relativistic electron beams at solar flare reconnection sites, are explored through an investigation of 152 instances observed by the Solar Terrestrial Relations Observatory mission. This study …
View article: HelioSwarm: A Multipoint, Multiscale Mission to Characterize Turbulence
HelioSwarm: A Multipoint, Multiscale Mission to Characterize Turbulence Open
View article: Quasi-thermal Noise Spectroscopy Analysis of Parker Solar Probe Data: Improved Electron Density Model for Solar Wind
Quasi-thermal Noise Spectroscopy Analysis of Parker Solar Probe Data: Improved Electron Density Model for Solar Wind Open
We present a comprehensive analysis of electron density measurements in the solar wind using quasi-thermal noise (QTN) spectroscopy applied to data from the first 15 encounters of the Parker Solar Probe mission (2018 November–2023 March). …
View article: Near-Sun In Situ and Remote-sensing Observations of a Coronal Mass Ejection and its Effect on the Heliospheric Current Sheet
Near-Sun In Situ and Remote-sensing Observations of a Coronal Mass Ejection and its Effect on the Heliospheric Current Sheet Open
During the thirteenth encounter of the Parker Solar Probe (PSP) mission, the spacecraft traveled through a topologically complex interplanetary coronal mass ejection (ICME) beginning on 2022 September 5. PSP traversed through the flank and…
View article: A Large Magnetic Hump in the VLISM Observed by Voyager 1 in 2020–2022
A Large Magnetic Hump in the VLISM Observed by Voyager 1 in 2020–2022 Open
Voyager 1 has been moving through the very local interstellar medium (VLISM) for approximately one solar cycle, from 122.58 au on 2012/DOY 238 (August 25) to 158.5 au on 2023.0. Previously, an abrupt increase (“jump”) in the magnetic field…
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
status: Published
View article: Perspectives on a NASA Heliophysics Mission Program for Addressing System Investigations
Perspectives on a NASA Heliophysics Mission Program for Addressing System Investigations Open
Whitepaper #170 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: infrastructure/workforce/other programmatic. Additional topics: other programmatic; space-based missions/projects.
View article: ICME Structure and Evolution in the Inner Heliosphere
ICME Structure and Evolution in the Inner Heliosphere Open
Whitepaper #384 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research. Additional topics: inner heliosphere; space-based missions/projects; user-need-driven basic space weather research.
View article: Plasma turbulence: Challenges and next transformative steps from the perspective of multi-spacecraft measurements
Plasma turbulence: Challenges and next transformative steps from the perspective of multi-spacecraft measurements Open
Synopsis We recommend to bring into reality the following within the next decade: 1. Measurements from multiple spacecraft covering a 3D volume and simultaneously spanning the MHD to kinetic scales (such as HelioSwarm). 2. Coordination of …
View article: Space weather investigation Frontier (SWIFT)
Space weather investigation Frontier (SWIFT) Open
The Space Weather Investigation Frontier (SWIFT) mission will aim at making major discoveries on the three-dimensional structure and dynamics of heliospheric structures that drive space weather. The focus will be on Interplanetary Coronal …