A5067606602- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Planetary Science and Exploration
- Earthquake Detection and Analysis
- Space Exploration and Technology
- GNSS positioning and interference
- Atmospheric Ozone and Climate
- Plasma Diagnostics and Applications
- Spacecraft Design and Technology
- Advanced MEMS and NEMS Technologies
- Space Satellite Systems and Control
- Geophysics and Gravity Measurements
- Mechanical and Optical Resonators
- Space exploration and regulation
- Laser-induced spectroscopy and plasma
- Scientific Research and Discoveries
- Magnetic Properties and Applications
- Mass Spectrometry Techniques and Applications
- Ion-surface interactions and analysis
- Magnetic and Electromagnetic Effects
- Hydrogen Storage and Materials
- Copper Interconnects and Reliability
- Stellar, planetary, and galactic studies
Space Research Institute
2016-2025
Austrian Academy of Sciences
2016-2025
University College London
2014-2020
Charles River Laboratories (Netherlands)
2018-2019
University of St Andrews
2013
Collisionless space plasma turbulence can generate reconnecting thin current sheets as suggested by recent results of numerical magnetohydrodynamic simulations. The MMS mission provides the first serious opportunity to check if small ion-electron-scale reconnection, generated turbulence, resembles reconnection events frequently observed in magnetotail or at magnetopause. Here we investigate field and particle observations obtained fleet turbulent terrestrial magnetosheath behind...
Abstract In this paper we use the full armament of MMS (Magnetospheric Multiscale) spacecraft to study magnetic reconnection in turbulent magnetosheath downstream a quasi‐parallel bow shock. Contrarily magnetopause and magnetotail cases, only few observations have been reported. The case presents, for first time, both fluid‐scale kinetic‐scale signatures an ongoing magnetosheath. are crossing inflow outflow regions ion diffusion region (IDR). Inside outflows D shape distributions observed....
Abstract The dual spacecraft mission BepiColombo is the first joint between European Space Agency (ESA) and Japanese Aerospace Exploration (JAXA) to explore planet Mercury. was launched from Kourou (French Guiana) on October 20th, 2018, in its packed configuration including two spacecraft, a transfer module, sunshield. cruise trajectory long journey into inner heliosphere, it includes one flyby of Earth (in April 2020), Venus 2020 August 2021), six Mercury (starting before orbit insertion...
An in situ measurement at the magnetopause shows that quadrupole pattern of Hall magnetic field, which is commonly observed a symmetric reconnection, still evident an asymmetric component but two quadrants adjacent to magnetosphere are strongly compressed into electron scale and widths remaining ion scale. The bipolar electric field generally created reconnection replaced by unipolar within electron-scale quadrants. Furthermore, it concluded spacecraft directly passed through inner diffusion...
Abstract We report the first Jupiter X‐ray observations planned to coincide with an interplanetary coronal mass ejection (ICME). At predicted ICME arrival time, we observed a factor of ∼8 enhancement in Jupiter's aurora. Within 1.5 h this enhancement, intense bursts non‐Io decametric radio emission occurred. Spatial, spectral, and temporal characteristics also varied between another observation two days later. Gladstone et al. (2002) discovered polar hot spot found it pulsed 45 min...
Abstract We compare case studies of Magnetospheric Multiscale (MMS)‐observed magnetopause electron diffusion regions (EDRs) to determine how the rate work done by electric field, varies with shear angle. analyze MMS‐observed EDR event a guide field approximately same size as magnetosheath reconnecting which occurred on 8 December 2015. find that was largest and positive near magnetic reversal point, though patchy lower amplitude also magnetosphere side crescent point. The current associated...
Abstract Energy conversion on the dipolarization fronts (DFs) has attracted much research attention through suggestion that intense current densities associated with DFs can modify more global magnetotail system. The structures a DF are at scale of one to few ion gyroradii, and their duration is comparable spacecraft's spin period. Hence, it crucial understand physical mechanisms measurements timescale shorter than We present case study whereby we use from Magnetospheric Multiscale (MMS)...
We identify a dayside electron diffusion region (EDR) encountered by the Magnetospheric Multiscale (MMS) mission and estimate terms in generalized Ohm's law that controlled energy conversion near X-point. MMS crossed moderate-shear (130 degrees) magnetopause southward of exact likely entered far from X-point, outside EDR, as size reconnection layer was less than but comparable to magnetosheath proton gyro-radius, also anisotropic gyrotropic "outflow" crescent distributions were observed....
Abstract Mirror mode waves are ubiquitous in the Earth's magnetosheath, particular behind quasi‐perpendicular shock. Embedded these nonlinear structures, intense lion roars often observed. Lion characterized by whistler wave packets at a frequency ∼100 Hz, which thought to be generated magnetic field minima. In this study, we make use of high time resolution instruments on board Magnetospheric MultiScale mission investigate and associated electron dynamics magnetosheath 22 January 2016. We...
The structure of the current sheet along Magnetospheric Multiscale (MMS) orbit is examined during 11 July 2017 Electron Diffusion Region (EDR) event. location MMS relative to X-line deduced and used obtain spatial changes in electron parameters. velocity gradient values are estimate reconnection electric field sustained by nongyrotropic pressure. It shown that observations consistent with theoretical expectations for an inner EDR 2-D reconnection. That is, magnetic scale, where due pressure...
Discontinuities in the solar wind, bow shock ripples or ionized dust clouds carried by high speed jets (HSJs) are observed magnetosheath. These HSJs have typically a Vx component larger than 200 km s-1 and their dynamic pressure can be few times wind pressure. We use conjunction of Cluster MMS, crossing simultaneously magnetopause, to study characteristics these impact on magnetopause. Over one hour-fifteen minutes interval magnetosheath, 21 HSJs. During same period, MMS 12 entered...
Abstract We analyze two ion scale dipolarization fronts associated with field‐aligned currents detected by the Magnetospheric Multiscale mission during a large substorm on 10 August 2016. The first event corresponds to fast dawnward flow an antiparallel current and could be generated wake of previous earthward flow. It is intense lower hybrid drift waves at front propagating perpendicular phase speed close electric thermal velocity. second reversal: from southwward/dawnward...
Abstract We present characteristics of current layers in the off‐equatorial near‐Earth plasma sheet boundary observed with high time‐resolution measurements from Magnetospheric Multiscale mission during an intense substorm associated multiple dipolarizations. The four spacecraft, separated by distances about 50 km, were located southern hemisphere dusk portion a wedge. They fast flow disturbances (up to 500 km/s), most dawn‐dusk direction. Field‐aligned currents initially within expanding...
Abstract We report on field‐aligned current observations by the four Magnetospheric Multiscale (MMS) spacecraft near plasma sheet boundary layer (PSBL) during two major substorms 23 June 2015. Small‐scale currents were found embedded in fluctuating PSBL flux tubes separatrix region. resolve, for first time, short‐lived earthward (downward) intense sheets with thicknesses of a few tens kilometers, which are well below ion scale, moving equatorward/earthward outward expansion. They coincide...
Fast coronal mass ejections (CMEs) drive the most severe geomagnetic storms. Forecasting their properties upstream of Earth has, in past, required sophisticated numerical models to be developed, run, and refined by experts. In this study, we present a new global MHD model for initiating following evolution CMEs from outer corona 1~AU. Based on successful astrophysical code, PLUTO, heliospheric (sunRunner3D) is easy install, set up, requiring relatively modest computer resources. To...
Space plasma turbulence incorporates multi-scale coexisting occurrences of many physical phenomena such as waves, large amplitude field and fluctuations, formation coherent structures the variety associated energy transfer, transport conversion processes. For example, magnetic reconnection converts to kinetic thermal energies accelerates particles. Contrarily, dynamo action refers processes through which fields are generated or/and amplified at expense energy. Magnetic has been extensively...
Between 1974 and 1975, the Mariner 10 spacecraft investigated Mercury's environment during three flybys. By using its ultraviolet spectrometer, it identified helium, atomic oxygen, hydrogen atoms in Mercury’s exosphere. Interestingly, no H2 molecules were detected these Based on data from occultation instrument, an upper limit for surface density was established detection threshold of about 1.4 x 107 cm-3. Here, we present first in-situ Hermean Exosphere, through magnetic field...
BepiColombo, the joint ESA-JAXA mission on route to planet Mercury, was launched in 2018. After eight successful planetary flybys, spacecraft had its final Mercury flyby 08 Jan 2025. The PICAM (Planetary Ion Camera) instrument, part of SERENA package, operational from 48 hours prior closest encounter, until afterwards. This ion sensor successfully monitored upstream solar wind, as well magnetospheric and ions at vicinity Mercury. Near planet, operated mass spectrometry mode using Hadamard...
Thanks to MESSENGER observations, we know that Mercury’s magnetosphere is highly dynamic, and it can be fully reconfigured in a few minutes, with strong influences of external conditions.BepiColombo mission includes comprehensive payload for the investigation environment. During cruise phase, not all sensors operate science measurements, however, during swing-bys magnetic field particles are successfully measured by MPO Mio payloads. In this presentation, will focus on swing-by 2...
The analysis of directional discontinuities (DDs) in the solar wind provides insights for understanding its embedded structures, such as flux ropes and switchbacks (SBs).We aim to investigate occurrence nature DDs observed by BepiColombo (BC) close Mercury’s orbit establish links between magnetic field measurements plasma parameters. Specifically, we assess potential indicators SBs other structures.We use attitude gradient detect combined with minimum variance characterize their...
Abstract Helium (He) was first detected by remote spectroscopic observations of the Ultraviolet Visible Spectrometers (UVVS) instrument in Mercury's exosphere during three Mariner 10 flybys 1974 and 1975. Here, we derive situ radial density profile He extended analyzing magnetic field plasma measurements from 2011 to 2015 obtained MErcury Surface, Space ENvironment, Geophysics, Ranging (MESSENGER) spacecraft. Our results indicate that most exospheric follows a thermal trend. Interestingly,...
The interaction of the solar wind (SW) with coupled magnetosphere-exosphere-surface Mercury is complex. Charged particles released by SW can precipitate along planetary magnetic field lines on specific areas surface planet. processes responsible for particle precipitation strongly depend orientation interplanetary (IMF) upstream Mercury. During third flyby (MFB3) BepiColombo, properties inferred from BepiColombo observations a highly compressed magnetosphere corresponded to those very dense...
Abstract. The Magnetospheric Multiscale mission (MMS1) data for 8 months in the winter periods of 2017–2018 and 2018–2019, when MMS had its apogee upstream solar wind Earth's bow shock, are used to study linear magnetic holes (LMHs). These LMHs characterized by a depression more than 50 % rotation background field less then 10∘. A total 406 found and, based on their magnetoplasma characteristics, split into three categories: cold (increase density, little change ion temperature), hot...
Abstract During the first flyby of BepiColombo composite spacecraft at Mercury in October 2021 ion spectrometers observed two intense spectral lines with energies between 10 and 70 eV. The persisted also larger distances from were again lower intensity during cruise phase March 2022 second third as a single band. composition indicates that water is dominant gas source. outgassing causes to charge up negative potential −50 V. distribution energy signal depends on low electron fluxes around...
The BepiColombo mission to Mercury consists of two spacecraft MPO and MIO was launched in 2018. During the cruise phase towards target performed its last close flyby near on 8 Jan 2025 (MSB6). This before going into orbit around innermost planet at end 2026. We report particle results from Mass Spectrum Analyzer MSA Planetary Ion Camera PICAM onboard together with magnetic field data MAG hybrid simulation during this flyby. measured solar wind upstream recorded magnetospheric magnetosheath...