Hans‐Ulrich Auster
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View article: Comparison of noise levels of different magnetometer types and space environments
Comparison of noise levels of different magnetometer types and space environments Open
The plasma environment around Earth has markedly different characteristics of the magnetic field across distinct spatial regions. In the solar wind, beyond Earth's magnetic influence, the magnetic field is relatively low and less fluctuati…
View article: In-depth Analysis of the 2022 March 28 <sup>3</sup>He-rich Solar Energetic Particle Event
In-depth Analysis of the 2022 March 28 <sup>3</sup>He-rich Solar Energetic Particle Event Open
On 2022 March 28, a solar eruption from active region AR 12975 produced a solar energetic particle (SEP) event observed by BepiColombo (BC; 0.57 au), STEREO-A (STA; 0.97 au), GOES (1.0 au), ACE (L1), and Wind (L1). The event was associated…
View article: Electron Phase Space Densities in Geostationary Orbits as Measured With GK2A, GOES‐16, and GOES‐17 Satellites
Electron Phase Space Densities in Geostationary Orbits as Measured With GK2A, GOES‐16, and GOES‐17 Satellites Open
This study investigated electron phase space densities (PSDs) in geostationary orbits using data from Korea's geostationary satellite, GK2A, as well as GOES‐16 and GOES‐17 satellites. The PSDs were computed from electron fluxes measured by…
View article: Influence of sensor noise levels on magnetometer calibration parameters
Influence of sensor noise levels on magnetometer calibration parameters Open
Magnetometers are prime instruments of scientific spacecraft targeting the space plasma environments of solar system bodies. Despite extensive ground calibration efforts, regular inflight calibration activities of these magnetometers have …
View article: Understanding the global structure of the September 5, 2022, coronal mass ejection using sunRunner3D
Understanding the global structure of the September 5, 2022, coronal mass ejection using sunRunner3D Open
Fast coronal mass ejections (CMEs) drive the most severe geomagnetic storms. In the past, forecasting their properties upstream of the Earth required developing and running complex numerical models. In this study, we present a new global M…
View article: A coronal mass ejection encountered by four spacecraft within 1 au from the Sun: ensemble modelling of propagation and magnetic structure
A coronal mass ejection encountered by four spacecraft within 1 au from the Sun: ensemble modelling of propagation and magnetic structure Open
Understanding and predicting the structure and evolution of coronal mass ejections (CMEs) in the heliosphere remains one of the most sought-after goals in heliophysics and space weather research. A powerful tool for improving current knowl…
View article: Challenges in Forecasting the Evolution of a Distorted CME Observed During the First Close Solar Orbiter Perihelion
Challenges in Forecasting the Evolution of a Distorted CME Observed During the First Close Solar Orbiter Perihelion Open
Coronal Mass Ejections (CMEs), drivers of the most severe Space Weather disturbances, are often assumed to evolve self-similarly during their propagation. However, open magnetic field structures in the corona, leading to higher-speed strea…
View article: BepiColombo observations of cold oxygen and carbon ions in the flank of the induced magnetosphere of Venus
BepiColombo observations of cold oxygen and carbon ions in the flank of the induced magnetosphere of Venus Open
On 10 August 2021, the Mercury-bound BepiColombo spacecraft performed its second fly-by of Venus and provided a short-lived observation of its induced magnetosphere. Here we report results recorded by the Mass Spectrum Analyzer on board Mi…
View article: In situ plasma and neutral gas observation time windows during a comet flyby: Application to the Comet Interceptor mission
In situ plasma and neutral gas observation time windows during a comet flyby: Application to the Comet Interceptor mission Open
A comet flyby, like the one planned for ESA's Comet Interceptor mission, places stringent requirements on spacecraft resources. To plan the time line of in situ plasma and neutral gas observations during the flyby, the size of the comet ma…
View article: Comparison of noise levels of different magnetometer types and space environments
Comparison of noise levels of different magnetometer types and space environments Open
The plasma environment around Earth is divided into several distinct regions with vastly different characteristics of the magnetic field. For example, inside the magnetosphere the magnetic field can reach tens of thousands of nanotesla. In…
View article: Multi-spacecraft observations of 10 December 2021 ICME impact on Mars
Multi-spacecraft observations of 10 December 2021 ICME impact on Mars Open
The Tianwen-1 spacecraft is China’s first Mars exploration mission, released by the China National Space Administration (CNSA). It was launched from the Wenchang Space Launch Center on Hainan Island on 2020 July 23 and entered into a…
View article: Multi Satellite Observation of a Foreshock Bubble Causing an Extreme Magnetopause Expansion
Multi Satellite Observation of a Foreshock Bubble Causing an Extreme Magnetopause Expansion Open
The interaction of a solar wind discontinuity with the backstreaming particles of the Earth’s ion foreshock can generate hot, tenuous plasma transients such as foreshock bubbles (FB) and hot flow anomalies (HFA). These transients are known…
View article: Multispacecraft Observations of a Widespread Solar Energetic Particle Event on 2022 February 15–16
Multispacecraft Observations of a Widespread Solar Energetic Particle Event on 2022 February 15–16 Open
On 2022 February 15–16, multiple spacecraft measured one of the most intense solar energetic particle (SEP) events observed so far in Solar Cycle 25. This study provides an overview of interesting observations made by multiple spacecraft d…
View article: On the Mesoscale Structure of Coronal Mass Ejections at Mercury’s Orbit: BepiColombo and Parker Solar Probe Observations
On the Mesoscale Structure of Coronal Mass Ejections at Mercury’s Orbit: BepiColombo and Parker Solar Probe Observations Open
On 2022 February 15, an impressive filament eruption was observed off the solar eastern limb from three remote-sensing viewpoints, namely, Earth, STEREO-A, and Solar Orbiter. In addition to representing the most-distant observed filament a…
View article: Improved modelling of SEP event onset within the WSA-Enlil-SEPMOD framework
Improved modelling of SEP event onset within the WSA-Enlil-SEPMOD framework Open
Multi-spacecraft observations of solar energetic particle (SEP) events not only enable a deeper understanding and development of particle acceleration and transport theories, but also provide important constraints for model validation effo…
View article: On the Mesoscale Structure of CMEs at Mercury's Orbit: BepiColombo and Parker Solar Probe Observations
On the Mesoscale Structure of CMEs at Mercury's Orbit: BepiColombo and Parker Solar Probe Observations Open
On 2022 February 15, an impressive filament eruption was observed off the solar eastern limb from three remote-sensing viewpoints, namely Earth, STEREO-A, and Solar Orbiter. In addition to representing the most-distant observed filament at…
View article: Improved modelling of SEP event onset within the WSA–Enlil–SEPMOD framework
Improved modelling of SEP event onset within the WSA–Enlil–SEPMOD framework Open
Multi-spacecraft observations of solar energetic particle (SEP) events not only enable a deeper understanding and development of particle acceleration and transport theories but also provide important constraints for model validation effor…
View article: Multi Satellite Observation of a Foreshock Bubble Causing an Extreme Magnetopause Expansion
Multi Satellite Observation of a Foreshock Bubble Causing an Extreme Magnetopause Expansion Open
The interaction of a solar wind discontinuity with the backstreaming particles of the Earth’s ion foreshock can generate hot, tenuous plasma transients such as foreshock bubbles (FB) and hot flow anomalies (HFA). These transients are known…
View article: Tianwen-1 and MAVEN Observations of the Response of Mars to an Interplanetary Coronal Mass Ejection
Tianwen-1 and MAVEN Observations of the Response of Mars to an Interplanetary Coronal Mass Ejection Open
Interplanetary coronal mass ejections (ICMEs) are solar transients that have significant effects on the upper atmosphere and ionosphere of Mars. The simultaneous spacecraft observations from Tianwen-1/MOMAG in solar wind and multiple instr…
View article: The Dynamic Evolution of Multipoint Interplanetary Coronal Mass Ejections Observed with BepiColombo, Tianwen-1, and MAVEN
The Dynamic Evolution of Multipoint Interplanetary Coronal Mass Ejections Observed with BepiColombo, Tianwen-1, and MAVEN Open
We present two multipoint interplanetary coronal mass ejections (ICMEs) detected by the Tianwen-1 and Mars Atmosphere and Volatile Evolution spacecraft at Mars and the BepiColombo (0.56 au ∼0.67 au) upstream of Mars from 2021 December 5 to…
View article: Unexpected local magnetic depression around Mercury: BepiColombo flyby-2 discovery
Unexpected local magnetic depression around Mercury: BepiColombo flyby-2 discovery Open
BepiColombo MPO and Mio spacecraft encounter the Mercury magnetosphere six times from 2021 to 2025 during the flyby maneuvers. Each flyby trajectory is unique and includes the magnetospheric regions that were not covered by MESSENGER. Mio/…
View article: BepiColombo mission confirms stagnation region of Venus and reveals its large extent
BepiColombo mission confirms stagnation region of Venus and reveals its large extent Open
The second Venus flyby of the BepiColombo mission offer a unique opportunity to make a complete tour of one of the few gas-dynamics dominated interaction regions between the supersonic solar wind and a Solar System object. The spacecraft p…
View article: High-energy particle enhancements in the solar wind upstream Mercury during the first BepiColombo flyby: SERENA/PICAM and MPO-MAG observations
High-energy particle enhancements in the solar wind upstream Mercury during the first BepiColombo flyby: SERENA/PICAM and MPO-MAG observations Open
Context. The first BepiColombo Mercury flyby offered the unique opportunity to simultaneously characterize the plasma and the magnetic field properties of the solar wind in the vicinity of the innermost planet of the Solar System (0.4 AU).…
View article: Observation and Modeling of the Solar Wind Turbulence Evolution in the Sub-Mercury Inner Heliosphere
Observation and Modeling of the Solar Wind Turbulence Evolution in the Sub-Mercury Inner Heliosphere Open
This letter exploits the radial alignment between the Parker Solar Probe and BepiColombo in late 2022 February, when both spacecraft were within Mercury’s orbit. This allows the study of the turbulent evolution, namely, the change in spect…
View article: Tracking of magnetic helicity evolution in the inner heliosphere
Tracking of magnetic helicity evolution in the inner heliosphere Open
Context. Magnetic helicity is one of the invariants in ideal magnetohydrodynamics, and its spectral evolution has a substantial amount of information to reveal the mechanism that are behind turbulence in space and astrophysical plasmas. Ai…
View article: Disappearance of the Polar Cap Ionosphere During Geomagnetic Storm on 11 May 2019
Disappearance of the Polar Cap Ionosphere During Geomagnetic Storm on 11 May 2019 Open
Multi‐instrument data from Jang Bogo Station (JBS) in Antarctica were utilized to study ionospheric responses to the 11 May 2019 moderate geomagnetic storm. These include Vertical Incident Pulsed Ionospheric Radar (VIPIR)/Dynasonde, Fabry‐…
View article: Comment on egusphere-2022-220
Comment on egusphere-2022-220 Open
Abstract. Accurate high-precision magnetic field measurements are a significant challenge for many applications including constellation missions studying space plasmas. Instrument stability and orthogonality are essential to enable meaning…
View article: The “Singular” Behavior of the Solar Wind Scaling Features during Parker Solar Probe–BepiColombo Radial Alignment
The “Singular” Behavior of the Solar Wind Scaling Features during Parker Solar Probe–BepiColombo Radial Alignment Open
At the end of 2020 September, the Parker Solar Probe (PSP) and BepiColombo were radially aligned: PSP was orbiting near 0.17 au and BepiColombo near 0.6 au. This geometry is of particular interest for investigating the evolution of solar w…
View article: In-Situ Multi-Spacecraft and Remote Imaging Observations of the First CME Detected by Solar Orbiter and BepiColombo
In-Situ Multi-Spacecraft and Remote Imaging Observations of the First CME Detected by Solar Orbiter and BepiColombo Open
On April 19th 2020 a CME was detected by Solar Orbiter at a heliocentric distance of 0.8 AU and was also observed in-situ on April 20th by both Wind and BepiColombo. During this time, BepiColombo had just completed a flyby of the Earth and…
View article: Planetary Defense Ground Zero: MASCOT's View on the Rocks - an Update between First Images and Sample Return
Planetary Defense Ground Zero: MASCOT's View on the Rocks - an Update between First Images and Sample Return Open
At 01:57:20 UTC on October 3rd, 2018, after 3½ years of cruise aboard the JAXA spacecraft HAYABUSA2 and about 3 months in the vicinity of its target, the MASCOT lander was separated successfully by from an altitude of 41 m. After a free-fa…