A5000045374- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Planetary Science and Exploration
- Magnetic Field Sensors Techniques
- Inertial Sensor and Navigation
- Geophysics and Gravity Measurements
- Stellar, planetary, and galactic studies
- Earthquake Detection and Analysis
- Magnetic confinement fusion research
- Astronomical Observations and Instrumentation
- Spacecraft and Cryogenic Technologies
- Sensor Technology and Measurement Systems
- Atmospheric Ozone and Climate
- Nuclear Physics and Applications
- Tropical and Extratropical Cyclones Research
- Historical Astronomy and Related Studies
- Gamma-ray bursts and supernovae
- Isotope Analysis in Ecology
- Atomic and Subatomic Physics Research
- Space Science and Extraterrestrial Life
- Advanced Electrical Measurement Techniques
- Fluid Dynamics and Vibration Analysis
- Magnetic and Electromagnetic Effects
Technische Universität Braunschweig
2016-2025
Max Planck Institute for Extraterrestrial Physics
2007
Intelligent Transport Systems Niedersachsen
1998
The Philae lander, part of the Rosetta mission to investigate comet 67P/Churyumov-Gerasimenko, was delivered cometary surface in November 2014. Here we report precise circumstances multiple landings Philae, including bouncing trajectory and rebound parameters, based on engineering data conjunction with operational instrument data. These also provide information mechanical properties (strength layering) surface. first touchdown site, Agilkia, appears have a granular soft (with compressive...
Abstract 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 most-distant at extreme ultraviolet wavelengths—captured by Orbiter's field of view extending above 6 R ⊙ —this event also associated with release a fast (∼2200 km s −1 ) coronal mass ejection (CME) that directed toward BepiColombo Parker Probe. These two probes were separated 2° in...
A multipoint analysis of conjugate magnetospheric and ionospheric flow vortices during the formation substorm current wedge (SCW) on 19 February 2008 is presented. During substorm, four Time History Events Macroscale Interactions Substorms (THEMIS) spacecraft were located close to neutral sheet in premidnight region between 9 12 R E geocentric distance, which three closely (∼1–2 ) clustered at ∼23 MLT one was farther west ∼21 MLT. The engulfed by a counterclockwise plasma vortex, while...
Following a long interval (many days) of sustained very quiet geomagnetic conditions, electromagnetic ion cyclotron (EMIC) wave activity was seen by the CARISMA array (www.carisma.ca) on ground for several hours simultaneously with enhanced solar wind density and related magnetic compression at GOES 12 29th June 2007. The THEMIS C, D, E satellites were outbound in “string‐of‐pearls” configuration each observed EMIC waves L‐shells ranging from 5 to 6.5. resolved some spatial‐temporal...
Observations with the Venus Express magnetometer and low-energy particle detector revealed magnetic field plasma behavior in near-Venus wake that is symptomatic of reconnection, a process occurs Earth's magnetotail but not expected nonmagnetized planet such as Venus. On 15 May 2006, flow this region was toward planet, component transverse to reversed. Magnetic reconnection changes topology results energy exchange between plasma. Thus, energetics resembles terrestrial tail, where stored later...
Abstract The magnetometer instrument MPO-MAG on-board the Mercury Planetary Orbiter (MPO) of BepiColombo mission en-route to is introduced, with its design, calibration and scientific targets. comprised two tri-axial fluxgate magnetometers mounted on a 2.9 m boom are 0.8 apart. They monitor magnetic field up 128 Hz in $\pm 2048$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>±</mml:mo> <mml:mn>2048</mml:mn> </mml:math> nT range. MPO will be injected into an initial $480...
On 2020 April 19 a coronal mass ejection (CME) was detected in situ by Solar Orbiter at heliocentric distance of about 0.8 AU. The CME later observed on 20th the Wind and BepiColombo spacecraft whilst located very close to Earth. This presents good opportunity for triple radial alignment study, as were separated less than 5$^\circ$ longitude. source CME, which launched 15th, an almost entirely isolated streamer blowout. STEREO-A event remotely from -75.1$^\circ$ longitude, is exceptionally...
Abstract 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 interesting observations made by during this event. Parker Probe (PSP) and BepiColombo were close to each other at 0.34–0.37 au (a radial separation ∼0.03 au) as they impacted flank associated coronal mass ejection (CME). At about 100° retrograde direction 1.5 away from Sun, radiation detector on board...
The intensification of the nightside whistler‐mode chorus emissions is observed in low‐density region outside plasmapause during injection anisotropic plasma sheet electrons into inner magnetosphere. Time History Events and Macroscale Interactions During Substorms data electron phase space density over energy range between 0.1 keV 30 are used to develop an analytical model for distribution injected suprathermal electrons. path‐integrated gain waves then evaluated with HOTRAY code by tracing...
[1] A statistical study of flux ropes and traveling compression regions (TCRs) during the Time History Events Macroscale Interactions Substorms second tail season has been performed. combined total 135 TCRs in range GSM X ∼ −14 to −31 RE were identified, many these occurring series two or more events separated by a few tens seconds. Those within 10 min each other into aggregated reconnection events. For purposes this survey, are most likely products simultaneously at multiple, closely spaced...
Abstract. We report on magnetic field measurements made in the innermost coma of 67P/Churyumov-Gerasimenko its low-activity state. Quasi-coherent, large-amplitude (δ B/B ~ 1), compressional oscillations at 40 mHz dominate immediate plasma environment nucleus. This differs from previously studied cometary interaction regions where waves ion gyro-frequencies are main feature. Thus classical pickup-ion-driven instabilities unable to explain observations. propose a cross-field current...
We demonstrate that the low frequency broadband magnetic fluctuations observed during THEMIS spacecraft traversals near Earth's magnetopause may be described as a turbulent spectrum of Doppler shifted kinetic Alfvén waves (KAWs). These are most intense along reconnected flux‐tubes in magnetosheath just outside magnetopause. identify distinct power‐law scalings wave spectral energy density wavenumber and show Landau (LD) transit time damping (TD) on ions electrons is largest at where index...
Stimulated by a recent study of kinetic ballooning/interchange instability Pritchett and Coroniti (2010), we present THEMIS events that confirm the predictions this mechanism. In these probes were situated in plasma sheet at 11 Re, near presumed location B minimum. Prior to substorm onset, they observed strong magnetic oscillations with periods 20–100 s δB X about 10–20 nT. Associated electric field δE Y ∼ 1 mV/m field‐aligned electron velocity several hundreds km/s. No comparable...
Knowledge of the magnetization planetary bodies constrains their origin and evolution, as well conditions in solar nebular at that time. On basis magnetic field measurements during descent subsequent multiple touchdown Rosetta lander Philae on comet 67P/Churyumov-Gerasimenko (67P), we show no global was detected within limitations analysis. The Magnetometer Plasma Monitor (ROMAP) suite sensors measured an upper magnitude less than 2 nanotesla cometary surface locations, with specific moment...
A simple analytical model for the calibration of a flux-gate magnetometer using relative sensor motion in constant magnitude magnetic field (B) is presented.
Planet Mercury has a global magnetic field of internal origin. Its low intensity, 340 nT at the equatorial surface, indicates that Hermean dynamo is special as much stronger fields are to be expected. Here, we suggest feedback model where embedded in an external which generated by Chapman‐Ferraro current small magnetosphere Mercury. This self‐generated ambient pronounced influence on action. Based kinematic α ‐Ω‐dynamo show two solutions, Hermean‐type solution with weak and Earth‐like one...
The induced magnetosphere at Venus consists of regions near the planet and its wake for which magnetic pressure dominates all other contributions. Initial Express measurements indicate a well‐defined outer boundary, magnetopause, magnetosphere. This magnetopause acts as an obstacle to deflect solar wind. Across this field exhibits abrupt directional changes pronounced draping. In paper, we examine structure using measurements. We find that is discontinuity resembling either tangential or...