A5068266197- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Earthquake Detection and Analysis
- GNSS positioning and interference
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Atmospheric Ozone and Climate
- Plasma Diagnostics and Applications
- Magnetic confinement fusion research
- Planetary Science and Exploration
- Magnetic Field Sensors Techniques
- Laser-induced spectroscopy and plasma
- Atomic and Molecular Physics
- Dust and Plasma Wave Phenomena
- Atomic and Subatomic Physics Research
- Gamma-ray bursts and supernovae
- Radiation Detection and Scintillator Technologies
- Spacecraft Design and Technology
- Methane Hydrates and Related Phenomena
- Fluid Dynamics and Turbulent Flows
- Lightning and Electromagnetic Phenomena
- Seismic Waves and Analysis
- Advanced Frequency and Time Standards
- Space Satellite Systems and Control
Swedish Institute of Space Physics
2016-2025
Uppsala University
2020-2024
University of Helsinki
2023
University of Oulu
2023
Western University
2019
University of Michigan
2014-2017
University of Science and Technology of China
2014
Heliophysics
2014
Goddard Space Flight Center
2014
John Wiley & Sons (United States)
2014
Abstract The European Space Agency's three Swarm satellites were launched on 22 November 2013 into nearly polar, circular orbits, eventually reaching altitudes of 460 km (Swarm A and C) 510 B). Swarm's multiyear mission is to make precision, multipoint measurements low‐frequency magnetic electric fields in Earth's ionosphere for the purpose characterizing generated both inside external Earth, along with other plasma parameters associated current systems magnetosphere. Electric perpendicular...
Abstract The current study explores how the topside equatorial and low‐latitude ionosphere responded to super geomagnetic storm on 10–11 May 2024, using in situ data from Swarm constellation. During storm's main phase, enhancements EIA (equatorial ionization anomaly) were observed, forming strong super‐fountains. EIAs extended toward latitudes beyond of magnetic equator, with crests being shifted equator both hemispheres during phase storm. Swarm‐A observed strongest storm‐time...
Magnetic reconnection leads to energy conversion in large volumes space but is initiated small diffusion regions. Because of the sizes regions, their crossings by spacecraft are rare. We report four-spacecraft observations a region encounter at Earth's magnetopause that allow us reliably distinguish spatial from temporal features. find stable on ion time and length scales agreement with numerical simulations. The electric field normal current sheet balanced Hall term generalized Ohm's law,...
Abstract In this study we calibrate and validate in situ ionospheric electron density ( N e ) temperature T measured with Langmuir probes (LPs) on the three Swarm satellites orbiting Earth circular, nearly polar orbits at ~500 km altitude. We assess accuracy reliability of LP data (December 2013 to June 2016) by using coincident measurements from low‐ middle‐latitude incoherent scatter radars (ISRs), low‐latitude ionosondes, Constellation Observing System for Meteorology, Ionosphere, Climate...
The EISCAT (European Incoherent SCATer) Scientific Association has provided versatile incoherent scatter (IS) radar facilities on the mainland of northern Scandinavia (the UHF and VHF systems) Svalbard electronically scanning ESR (EISCAT Radar) for studies high-latitude ionised upper atmosphere ionosphere). radars were constructed about 30 years ago, based technological solutions that time. science drivers today, however, require a more flexible instrument, which allows measurements to be...
Abstract The SWARM satellites have both upward looking GPS receivers and Langmuir probes. repeatedly lost track of the L1 band signal in January–February 2014 at postsunset hours, when was nearly 500 km altitude. This indicates that disturbed by ionospheric irregularities this height above. losses occurred right density gradients associated with equatorial plasma bubbles predominantly where measured background highest. showed strong phase scintillations rather than amplitude, indicating...
Abstract Little is currently known about the optical phenomenon as Steve. The first scientific publication on subject suggests that Steve associated with an intense subauroral ion drift (SAID). However, additional inquiry warranted this suggested relationship it based a single case study. Here we present eight occurrences of coincident or near‐coincident measurements from European Space Agency's Swarm satellites and show consistently SAID. When satellite observations are compared to typical...
High-resolution in situ measurements from the three Swarm spacecraft, a string-of-pearls configuration, provide new insights about combined role of flow channel events and particle impact ionization creating $\textit{F}$ region electron density structures northern Scandinavian dayside cusp. We present case polar cap patch formation where reconnection-driven low-density relative westward is eroding solar-ionized plasma but cusp dominates initial structuring. In cusp, features are observed...
Abstract. The lower-thermosphere–ionosphere (LTI) system consists of the upper atmosphere and lower part ionosphere as such comprises a complex coupled to both below space above. atmospheric LTI is dominated by laws continuum fluid dynamics chemistry, while plasma controlled electromagnetic forces driven magnetosphere, solar wind, well wind dynamo. hence domain many different physical processes. However, systematic in situ measurements within this region are severely lacking, although...
Abstract. Swarm is the European Space Agency (ESA)'s first Earth observation constellation mission, which was launched in 2013 to study geomagnetic field and its temporal evolution. Two Langmuir probes aboard each of three satellites provide situ measurements plasma parameters, contribute ionospheric dynamics. To maintain a high data quality for scientific technical applications, products are continuously monitored validated via science-oriented diagnostics. This paper presents an overview...
The lower thermosphere-ionosphere (LTI) is a key transition region between Earth’s atmosphere and space. Interactions ions neutrals maximize within the LTI in particular at altitudes from 100 to 200 km, which least visited of near-Earth environment. lack situ co-temporal co-spatial measurements all relevant parameters their elusiveness most remote-sensing methods means that complex interactions its neutral charged constituents remain poorly characterized this date. This measurements,...
Abstract. The four Cluster spacecraft provide an excellent opportunity to study spatial structures in the magnetosphere and adjacent regions. Propagating waves are amongst interesting for first time, will allow one measure wave vector of low-frequency fluctuations a space plasma. Based on generalized minimum variance analysis estimates be determined terrestrial magnetosheath near-Earth solar wind. virtue weakness telescope technique used is discussed detail.Key words. Electromagnetics (wave...
We use data from the Cluster satellites to study waves in frequency range of ∼2–150 Hz at magnetopause. In addition broad band wave turbulence we identify lower hybrid drift and whistler waves. Wave amplitudes maximize within narrow current sheets that are associated with density gradients electron beams can be separatrices reconnection. The dispersion properties studied using interferometric measurements electric field. A direct estimate role particle diffusion across magnetopause shows...
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not.The documents may come from teaching institutions in France abroad, public private centers.L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de scientifiques niveau recherche, publiés ou non, émanant des établissements d'enseignement recherche français étrangers, laboratoires publics privés.Structure separatrix...
Abstract. The Daedalus mission has been proposed to the European Space Agency (ESA) in response call for ideas Earth Observation program's 10th Explorer. It was selected 2018 as one of three candidates a phase-0 feasibility study. goal is quantify key electrodynamic processes that determine structure and composition upper atmosphere, gateway between Earth's atmosphere space. An innovative preliminary design allows access electrodynamics down altitudes 150 km below. will perform situ...
Abstract In this study, we perform the first comprehensive comparison of ion density (Ni) in topside ionosphere measured by Langmuir probe (LP) and faceplate (FP) thermal imager on board Swarm satellites. Our results show a systematic difference between LP FP derived Ni values, shows prominent dependences solar flux, local time, season. Although both datasets generally good linear regression with electron (Ne) measurements from incoherent scatter radar (ISR) located at Jicamarca, an...
Experimental evidence is provided for the existence of slow-mode magnetosonic solitons in col-lisionless plasma at magnetopause boundary layer. The were detected by fleet Cluster spacecraft dusk flank magnetosphere as magnetic field depressions (up to 85%) accom-panied with enhancement density and temperature a factor 2. propagate 250 km/s respect satellites have perpendicular size 1000-2000 km, which few ion inertial scale lengths. comparison numerical solutions theoretical model shows...
The ability of the tristatic UHF radar EISCAT to measure plasma velocities in F region has been employed for assessment such motions proximity and relative auroral arcs. This required real‐time tracking arcs with upon command from ground station monitoring aurora. Slow arc order 30‐90 m s −1 were deduced observations, but error sources are considerable. Three cases presented, representing different situations. may move into an current system or out it. first case corresponds energy...
We study the plasma turbulence, at scales larger than ion inertial length scale, downstream of a quasiparallel bow shock using Cluster multispacecraft measurements. show that turbulence is intermittent and well described by extended structure function model, which takes into account spatial inhomogeneity cascade rate. For first time we use observations to characterize evolution magnetosheath particularly its intermittency, as distance from shock. The intermittency significantly changes over...
Abstract. The magnetopause (MP) reconnection is characterized by a density asymmetry across the current sheet. expected to produce characteristic features in layer. Here we present comparison between Cluster MP crossing reported Retinò et al. (2006) and virtual observations two-dimensional particle-in-cell simulation results. simulation, which includes but has zero guide field initial condition, reproduced well observed as follows: (1) prominent dip region detected at separatrix (SR) on...
We have investigated how geomagnetic activity, the solar wind (SW), and interplanetary magnetic field (IMF) influence occurrence of F ‐region/topside ionospheric ion upflow downflow. Occurrence dayside observed with European Incoherent Scatter Svalbard radar (ESR) at 75.2° latitude is highly correlated SW density, as well strength IMF By component. suggest that this correlation exists because region where occurs enlarged owing to density magnitude, but it does not move significantly in...