Sofia Bergman
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View article: Characteristics of Counter-Streaming Ions at Comet 67P
Characteristics of Counter-Streaming Ions at Comet 67P Open
Rosetta measurements at comet 67P revealed ion speeds of 5–10 km/s, far exceeding the observed speed of the neutral gas of 0.5–1 km/s. Models assuming an ion speed similar to the neutral gas also give good agreement with measurements of io…
View article: Empirical Parametric Model for Venus Plasma Boundaries Based on Venus Express Data
Empirical Parametric Model for Venus Plasma Boundaries Based on Venus Express Data Open
Venus’s induced magnetosphere is characterized by regions with different plasma and magnetic field properties, which are separated by plasma boundaries. These boundaries’ locations and shapes vary with upstream solar wind conditions, and t…
View article: Statistical Study of the Propagation Velocity of Short Large-Amplitude Magnetic Structures (SLAMS) in the Foreshock of Earth
Statistical Study of the Propagation Velocity of Short Large-Amplitude Magnetic Structures (SLAMS) in the Foreshock of Earth Open
The bow shock at Earth is created when the super-Alfvénic solar wind interacts with Earth’s magnetosphere and is slowed to sub-Alfvénic velocities. Depending on the angle θBn between the interplanetary magnetic field a…
View article: Statistical study of SLAMS at different planetary foreshock
Statistical study of SLAMS at different planetary foreshock Open
Properties of the region upstream of planetary bow shock depend strongly on the direction of the interplanetary magnetic field. For quasi-parallel bow shock, part of the solar wind ions are reflected back upstream from the shock and t…
View article: Investigation of the Ultralow Frequency (ULF) foreshock boundary at Mercury
Investigation of the Ultralow Frequency (ULF) foreshock boundary at Mercury Open
Ultralow frequency (ULF) waves are found in certain parts of the upstream region of planetary bow shocks. These waves are believed to be driven by the interaction of solar wind ions reflected from the bow shock with the original solar wind…
View article: Statistical Properties of Short Large‐Amplitude Magnetic Structures (SLAMS) in the Foreshock of Earth From Cluster Measurements
Statistical Properties of Short Large‐Amplitude Magnetic Structures (SLAMS) in the Foreshock of Earth From Cluster Measurements Open
Short Large‐Amplitude Magnetic Structures (SLAMS) are non‐linear isolated magnetic field structures commonly observed in the foreshock region of quasi‐parallel collisionless shocks. In this work, we use an automated algorithm to create a d…
View article: Statistical properties of Short Large-Amplitude Magnetic Structures (SLAMS) in the foreshock region of Earth
Statistical properties of Short Large-Amplitude Magnetic Structures (SLAMS) in the foreshock region of Earth Open
Short Large-Amplitude Magnetic Structures (SLAMS) are common magnetic field signatures observed in the foreshock region of collisionless quasi-parallel shocks. SLAMS are non-linear isolated structures, defined to have an amplitude of more …
View article: Statistical study of SLAMS at the Martian foreshock
Statistical study of SLAMS at the Martian foreshock Open
Properties of the region upstream of planetary bow shocks depend strongly on the direction of the interplanetary magnetic field. For quasi-parallel bow shocks, part of the solar wind ions are reflected back upstream from the shock and…
View article: Spacecraft potential effects on low-energy ion measurements to be made by probe B1 of Comet Interceptor
Spacecraft potential effects on low-energy ion measurements to be made by probe B1 of Comet Interceptor Open
Spacecraft charging causes notorious issues for low-energy plasma measurements. The charged particles are accelerated towards or repelled from the spacecraft surface, affecting both their energy and travel direction. The latter results in …
View article: Spacecraft Charging Simulations of Probe B1 of Comet Interceptor during the Cometary Flyby
Spacecraft Charging Simulations of Probe B1 of Comet Interceptor during the Cometary Flyby Open
Comet Interceptor will be the first mission to make a flyby of a long-period or interstellar comet. After launch, the spacecraft will wait at the Sun–Earth Lagrange point L2 for a yet-to-be-discovered comet to appear. The mission comprises…
View article: Data for "Spacecraft charging simulations of probe B1 of Comet Interceptor during the cometary flyby"
Data for "Spacecraft charging simulations of probe B1 of Comet Interceptor during the cometary flyby" Open
Simulation results of the spacecraft-plasma interactions of probe B1 of Comet Interceptor obtained with the Spacecraft Plasma Interaction Software (SPIS) and the ElectroMagnetic Spacecraft Environment Simulator (EMSES). Detailed descriptio…
View article: Data for "Spacecraft charging simulations of probe B1 of Comet Interceptor during the cometary flyby"
Data for "Spacecraft charging simulations of probe B1 of Comet Interceptor during the cometary flyby" Open
Simulation results of the spacecraft-plasma interactions of probe B1 of Comet Interceptor obtained with the Spacecraft Plasma Interaction Software (SPIS) and the ElectroMagnetic Spacecraft Environment Simulator (EMSES). Detailed descriptio…
View article: Perturbations of JUICE/JDC Ion Measurements Caused by Spacecraft Charging in the Jovian Magnetosphere and the Ionosphere of Ganymede
Perturbations of JUICE/JDC Ion Measurements Caused by Spacecraft Charging in the Jovian Magnetosphere and the Ionosphere of Ganymede Open
Spacecraft charging is a well‐known effect that occurs when a spacecraft is located in a charged environment such as plasma. In this process, the surface of the spacecraft acquires an electrostatic potential through the accumulation and em…
View article: Influence of Solar Wind Variations on the Shapes of Venus’ Plasma Boundaries Based on Venus Express Observations
Influence of Solar Wind Variations on the Shapes of Venus’ Plasma Boundaries Based on Venus Express Observations Open
The interaction between the solar wind and Venus creates an induced magnetosphere. The regions of the induced magnetosphere are separated by plasma boundaries, where their shapes and sizes are influenced by variations in the surrounding en…
View article: Venusian bow shock crossings manually identified from measurements by the ASPERA-4 and MAG instruments onboard Venus Express
Venusian bow shock crossings manually identified from measurements by the ASPERA-4 and MAG instruments onboard Venus Express Open
Bow shock crossings at Venus identified manually from the ASPERA-4 and MAG instruments onboard Venus Express for the full mission from 2006 to 2014. A detailed description of the dataset can be found in the paper "Influence of solar wind v…
View article: Venusian bow shock crossings manually identified from measurements by the ASPERA-4 and MAG instruments onboard Venus Express
Venusian bow shock crossings manually identified from measurements by the ASPERA-4 and MAG instruments onboard Venus Express Open
Bow shock crossings at Venus identified manually from the ASPERA-4 and MAG instruments onboard Venus Express for the full mission from 2006 to 2014. A detailed description of the dataset can be found in the paper "Influence of solar wind v…
View article: Ion-ion cross-field instability of lower hybrid waves in the inner coma of comet 67P
Ion-ion cross-field instability of lower hybrid waves in the inner coma of comet 67P Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Journal of Geophysical Research - Space Physics. ESSOAr is a venue for early communication or feedback before peer review. Data may be p…
View article: Reconstruction of the upstream solar wind at comet 67P
Reconstruction of the upstream solar wind at comet 67P Open
<p><span>&#160;</span>Rosetta followed comet 67P at heliocentric distances from 1.25 to 3.6 au. The solar wind was observed for much of this time, but significantly deflected and to some extent slowed down by the inte…
View article: Upstream solar wind speed at comet 67P
Upstream solar wind speed at comet 67P Open
Context. Rosetta followed comet 67P at heliocentric distances from 1.25 to 3.6 au. The solar wind was observed for much of this time, but was significantly deflected and to some extent slowed down by the interaction with the coma. Aims. We…
View article: Plasma densities, flow, and solar EUV flux at comet 67P
Plasma densities, flow, and solar EUV flux at comet 67P Open
Context. During its two-year mission at comet 67P, Rosetta nearly continuously monitored the inner coma plasma environment for gas production rates varying over three orders of magnitude, at distances to the nucleus ranging from a few to a…
View article: Flow directions of low-energy ions in and around the diamagnetic cavity of comet 67P
Flow directions of low-energy ions in and around the diamagnetic cavity of comet 67P Open
The flow direction of low-energy ions around comet 67P/Churyumov–Gerasimenko has previously been difficult to constrain due to the influence of the spacecraft potential. The Ion Composition Analyzer of the Rosetta Plasma Consortium (RPC-IC…
View article: Ion energy and momentum flux near the cometopause of Comet 67P/Churyumov-Gerasimenko
Ion energy and momentum flux near the cometopause of Comet 67P/Churyumov-Gerasimenko Open
<p>Defined as the region where the plasma interaction region of a comet goes from being solar wind-dominated to cometary ion-dominated, the cometopause is a region of comingling plasmas and complex dynamics. The Rosetta mission orbit…
View article: Statistical analysis of the accelerated H2O ions above 1 keV: the comet 67P/Churyumov&#8211;Gerasimenko observed by the Rosetta spacecraft.
Statistical analysis of the accelerated H2O ions above 1 keV: the comet 67P/Churyumov–Gerasimenko observed by the Rosetta spacecraft. Open
<p>The ESA/Rosetta spacecraft has studied the comet 67P/Churyumov-Gerasimenko for two years. Rosetta Plasma Consortium's Ion Composition Analyser (RPC/ICA) detected comet-origin water ions that are accelerated to > 100 eV.<span…
View article: Ion bulk speeds and temperatures in the diamagnetic cavity of comet 67P
Ion bulk speeds and temperatures in the diamagnetic cavity of comet 67P Open
<p>The formation and maintenance of the diamagnetic cavity around comets is a debated subject. For active comets such as 1P/Halley, the ion-neutral drag force is suggested to balance the outside magnetic pressure at the cavity bounda…
View article: Ion bulk speeds and temperatures in the diamagnetic cavity of comet 67P from RPC-ICA measurements
Ion bulk speeds and temperatures in the diamagnetic cavity of comet 67P from RPC-ICA measurements Open
Comets are constantly interacting with the solar wind. When the comet activity is high enough, this leads to the creation of a magnetic field free region around the nucleus known as the diamagnetic cavity. It has been suggested that the io…
View article: Energy structure of the accelerated H2O ions above 1 KeV: the comet 67P/Churyumov-Gerasimenko observed by the Rosetta spacecraft
Energy structure of the accelerated H2O ions above 1 KeV: the comet 67P/Churyumov-Gerasimenko observed by the Rosetta spacecraft Open
IntroductionThe Plasma Consortium Ion Composition Analyzer (RPC/ICA) onboard ESA's Rosetta mission has revealed that comet-origin water ions are accelerated in a more complicated manner than previously thought[1]. Understanding these accel…
View article: Low-energy ion bulk velocities and temperatures inside the diamagnetic cavity of comet 67P
Low-energy ion bulk velocities and temperatures inside the diamagnetic cavity of comet 67P Open
IntroductionComets are unique objects. Due to their varying distance to the Sun, and the resulting variation of the plasma environment, they provide a unique opportunity to study plasma processes and an objects interaction with the solar w…
View article: Average cometary ion flow pattern in the vicinity of comet 67P from moment data
Average cometary ion flow pattern in the vicinity of comet 67P from moment data Open
Average flow patterns of ions around comet 67P detected by the RPC-ICA instrument onboard Rosetta are presented both as a time series and as a spatial distribution of the average flow in the plane perpendicular to the comet – Sun direction…
View article: The Influence of Varying Spacecraft Potentials and Debye Lengths on In Situ Low‐Energy Ion Measurements
The Influence of Varying Spacecraft Potentials and Debye Lengths on In Situ Low‐Energy Ion Measurements Open
Low‐energy ions are difficult to measure, mainly due to spacecraft charging. The ions are attracted to or repelled from the charged surface prior to detection, which changes both the energy and travel direction of the ions. This results in…
View article: Observations of low energy ions around the diamagnetic cavity at comet 67P
Observations of low energy ions around the diamagnetic cavity at comet 67P Open
<p>We investigate the variations in low energy cometary ions around comet 67P. Detailed measurements of these ions were made possible by implementing a new instrumental mode of the ion mass spectrometer on the Rosetta spacecraft. The…