A5070639192- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Earthquake Detection and Analysis
- Stellar, planetary, and galactic studies
- Planetary Science and Exploration
- Magnetic confinement fusion research
- Astronomy and Astrophysical Research
- Geophysics and Gravity Measurements
- Astrophysics and Star Formation Studies
- Plasma Diagnostics and Applications
- Magnetic Field Sensors Techniques
- Astronomical Observations and Instrumentation
- Atomic and Subatomic Physics Research
- Statistical Mechanics and Entropy
- Atmospheric Ozone and Climate
- Laser-induced spectroscopy and plasma
- Gamma-ray bursts and supernovae
- Space Science and Extraterrestrial Life
- GNSS positioning and interference
- Space Exploration and Technology
- Particle accelerators and beam dynamics
- Dust and Plasma Wave Phenomena
- Inertial Sensor and Navigation
Space Research Institute
2016-2025
Austrian Academy of Sciences
2016-2025
University of Geneva
2024
Chinese Academy of Sciences
2023
University of Science and Technology of China
2023
South Central Minzu University
2023
Southwest Research Institute
2023
Swedish Institute of Space Physics
2023
Charles River Laboratories (Netherlands)
2016-2019
John Wiley & Sons (United States)
2016-2018
High‐speed flows in the inner central plasma sheet (first reported by Baumjohann et al. (1990)) are studied, together with concurrent behavior of and magnetic field, using AMPTE/IRM data from ≈ 9 to 19 R E Earth's magnetotail. The conclusions drawn detailed analysis a representative event reinforced superposed epoch applied on 2 years data. high‐speed organize themselves 10‐min time scale flow enhancements which we call bursty bulk (BBF) events. Both temporal spatial effects responsible for...
The success of the Magnetospheric Multiscale mission depends on accurate measurement magnetic field all four spacecraft. To ensure this success, two independently designed and built fluxgate magnetometers were developed, avoiding single-point failures. dubbed digital (DFG), which uses an ASIC implementation was supplied by Space Research Institute Austrian Academy Sciences analogue magnetometer (AFG) with a more traditional circuit board design University California, Los Angeles. A stringent...
The near‐Earth neutral line (NENL) model of magnetospheric substorms is reviewed. observed phenomenology discussed including the role coupling with solar wind and interplanetary magnetic field, growth phase sequence, expansion (and onset), recovery phase. New observations modeling results are put into context prior framework. Significant issues concerns about shortcomings NENL addressed. Such as ionosphere‐tail coupling, large‐scale mapping, onset triggering, observational timing discussed....
Using a common methodology to analyze data from the AMPTE/IRM and ISEE 2 satellites we report on statistical properties of bursty bulk flow events (BBFs) in inner plasma sheet (IPS). A positive correlation between BBFs AE index suggests that are predominantly geomagnetically active time phenomena. Earthward more frequent close midnight away Earth, up distance ∼19 R E . Tailward very infrequent IRM set somewhat less region satellites' spatial overlap, possibly due conditions prevailing during...
Using 8 months of tail data obtained with the AMPTE/IRM satellite, more than 270,000 ion moments and magnetic field measurements were analyzed respect to occurrence rates typical characteristics high‐speed flows velocities in excess 400 km/s. The plasma sheet boundary layer, outer central neutral neighborhood have a 4∶1∶2 ratio for 400–600 For 800 km/s, there is only minimal chance detect them but equal chances two other regions. high AE inner are greater find layer. In flow rate small...
Using four months of tail data obtained by the three‐dimensional plasma instrument on board AMPTE/IRM satellite in 1986, we have done a statistical survey behavior ion and electron moments central sheet. Almost 80,000 spin averages density, bulk velocity, temperature, β were analyzed with respect to differences between their values inner outer sheet as well dependence magnetic activity. The temperature increases increasing activity while density decreases during disturbed intervals, except...
Magnetic reconnection is a fundamental physical process in plasmas whereby stored magnetic energy converted into heat and kinetic of charged particles. Reconnection occurs many astrophysical plasma environments laboratory plasmas. Using measurements with very high time resolution, NASA's Magnetospheric Multiscale (MMS) mission has found direct evidence for electron demagnetization acceleration at sites along the sunward boundary Earth's magnetosphere where interplanetary field reconnects...
The terrestrial ring current is an electric flowing toroidally around the Earth, centered at equatorial plane and altitudes of ∼10,000–60,000 km. Changes in this are responsible for global decreases Earth's surface magnetic field, which known as geomagnetic storms. Intense storms have severe effects on technological systems, such disturbances or even permanent damage to telecommunication navigation satellites, cables, power grids. main carriers storm positive ions, with energies from ∼1 keV...
We have studied possible braking mechanisms of high‐speed ion flows in the near‐Earth central plasma sheet for radial distances between 9 and 19 Earth Radii ( R E ) on basis observations made by AMPTE/IRM satellite. Flows with velocities excess 400 km/s are almost always Earthward this range, indicating that source is beyond . Though occurrence rate substantially decreases when satellite comes closer to Earth, higher than 600 still observed. suggest stopped at a clear boundary regions...
The FIELDS instrumentation suite on the Magnetospheric Multiscale (MMS) mission provides comprehensive measurements of full vector magnetic and electric fields in reconnection regions investigated by MMS, including dayside magnetopause night-side magnetotail acceleration out to 25 Re. Six sensors each four MMS spacecraft provide overlapping these with sensitive cross-calibrations both before after launch. consist redundant flux-gate magnetometers (AFG DFG) over frequency range from DC 64 Hz,...
A total of 21 passes AMPTE/IRM through the dayside (0800–1600 hours local time) low‐latitude magnetospheric boundary region have been examined, all which were characterized by large magnetic shear across magnetopause. The purpose study was to use improved accuracy and time resolution IRM plasma measurements reexamine occurrence high‐speed flows as signatures reconnection process at 12 showed magnetopause crossings with flows. duration these sometimes short 10 s rarely more than 30 s. is...
In this paper we study a flow burst event which took place during enhanced geomagnetic activity on July 22, 2001, when Cluster was located in the postmidnight magnetotail. The associated with clear dipolarization ahead of high‐speed part predominantly Earthward directed flow. Based analysis four spacecraft data, found that ∼2000 km thick front moves and dawnward speed ∼77 km/s. plasma before is deflected, consistent localized bubble centered at midnight side being pushed aside by moving...
Almost 40 years ago the concept of substorm current wedge was developed to explain magnetic signatures observed on ground and in geosynchronous orbit during expansion. In ensuing decades new observations, including radar low-altitude spacecraft, MHD simulations, theoretical considerations have tremendously advanced our understanding this system. The AMPTE/IRM, THEMIS Cluster missions added considerable observational knowledge, especially important role fast flows producing stresses that...
Ground based radial velocity (RV) searches continue to discover exoplanets below Neptune mass down Earth mass. Furthermore, ground transit now reach milli-mag photometric precision and can size planets around bright stars. These will find stars anywhere on the sky, their discoveries representing prime science targets for further study due proximity brightness of host A mission follow-up measurements these is currently lacking. The first ESA S-class CHEOPS (CHaracterizing ExoPlanet Satellite)...
The magnetometer instrument on the Solar Orbiter mission is designed to measure magnetic field local spacecraft continuously for entire duration. need characterise not only background but also its variations scales from far above well below proton gyroscale result in challenging requirements stability, precision, and noise, as operational limitations both other instruments. vibration thermal environment has led significant development of mechanical sensor design. overall design, performance,...
Determining the architecture of multi-planetary systems is one cornerstones understanding planet formation and evolution. Resonant are especially important as fragility their orbital configuration ensures that no significant scattering or collisional event has taken place since earliest phase when parent protoplanetary disc was still present. In this context, TOI-178 been subject particular attention first TESS observations hinted at a 2:3:3 resonant chain. Here we report results from...
Abstract BepiColombo is a joint mission between the European Space Agency, ESA, and Japanese Aerospace Exploration JAXA, to perform comprehensive exploration of Mercury. Launched on $20^{\mathrm{th}}$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mn>20</mml:mn> <mml:mi>th</mml:mi> </mml:msup> </mml:math> October 2018 from spaceport in Kourou, French Guiana, spacecraft now en route Two orbiters have been sent Mercury will be put into dedicated, polar orbits around...
This paper attempts to summarize the current understanding of storm/substorm relationship by clearing up a considerable amount controversy and addressing question how solar wind energy is deposited into dissipated in constituent elements that are critical magnetospheric ionospheric processes during magnetic storms. (1) Four mechanisms identified discussed as primary causes enhanced electric fields interplanetary medium responsible for geomagnetic It pointed out reality, these four...
We have studied 38 low‐latitude, dayside (0800‐1600 LT) magnetopause crossings by the AMPTE/IRM satellite to investigate variations of key plasma parameters and magnetic field in magnetosheath region adjacent magnetopause. find that structures dynamics flows this depend strongly on shear across magnetopause, is, angle between geomagnetic field. When is low (<30°), a transition layer, also called “plasma depletion layer,” 10‐min average width exists where piles up against In density β as...
Spatial gradients of high‐speed flows in the midtail plasma sheet are determined using multipoint observations from Cluster spacecraft along “dawn‐dusk” direction (perpendicular to main flow and plane tail current sheet) north‐south direction. If we take average or median spatial assume that channel has a linear gradient, these values suggest full width is 2–3 R E 1.5–2 The velocity gradient at duskward edge tends be sharper than dawnward edge, possibly reflecting an asymmetry...