A5077891526- Ionosphere and magnetosphere dynamics
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Earthquake Detection and Analysis
- GNSS positioning and interference
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Planetary Science and Exploration
- Inertial Sensor and Navigation
- Meteorological Phenomena and Simulations
- Atmospheric and Environmental Gas Dynamics
- Spacecraft Design and Technology
- Spacecraft and Cryogenic Technologies
- Climate variability and models
- Seismic Waves and Analysis
- Geophysical and Geoelectrical Methods
- Satellite Image Processing and Photogrammetry
- Atmospheric aerosols and clouds
- Calibration and Measurement Techniques
- Oceanographic and Atmospheric Processes
- Advanced Frequency and Time Standards
- Space Satellite Systems and Control
- Pulsars and Gravitational Waves Research
- Fault Detection and Control Systems
Royal Netherlands Meteorological Institute
2019-2025
Delft University of Technology
2010-2019
European Space Agency
2014
SRON Netherlands Institute for Space Research
2011
The Horizontal Wind Model (HWM) has been updated in the thermosphere with new observations and formulation changes. These data are ground‐based 630 nm Fabry‐Perot Interferometer (FPI) measurements equatorial polar regions, as well cross‐track winds from Gravity Field Steady State Ocean Circulation Explorer (GOCE) satellite. GOCE wind provide valuable twilight regions. FPI fill latitudinal gaps prior observational database. Construction of this reference model also provides opportunity to...
Abstract NRLMSIS® 2.0 is an empirical atmospheric model that extends from the ground to exobase and describes average observed behavior of temperature, eight species densities, mass density via a parametric analytic formulation. The inputs are location, day year, time day, solar activity, geomagnetic activity. NRLMSIS major, reformulated upgrade previous version, NRLMSISE‐00. now couples thermospheric densities entire column, effective profile transitions each fully mixed region below ~70 km...
Swarm, a three-satellite constellation to study the dynamics of Earth’s magnetic field and its interactions with Earth system, is expected be launched in late 2013. The objective Swarm mission provide best ever survey geomagnetic temporal evolution, order gain new insights into system by improving our understanding interior environment. In derive advanced models (and other higher-level data products) it necessary take explicit advantage aspect Swarm. SCARF (SatelliteConstellationApplication...
Covers advancements in spacecraft and tactical strategic missile systems, including subsystem design application, mission analysis, materials structures, developments space sciences, processing manufacturing, operations, applications of technologies to other fields.
Abstract By using data from multiple instruments, we investigate ionospheric/thermospheric behavior during the period 21 to 23 June 2015, when three interplanetary shocks (IS) of different intensities arrived at Earth. The first IS was registered 16:45 UT on and caused ~50 nT increase in SYM ‐ H index. second 5:45 22 induced an enhancement auroral/substorm activity that led rapid thermospheric neutral mass density ionospheric vertical total electron content high latitudes. Several hours...
The Swarm satellites were launched on November 22, 2013, and carry accelerometers GPS receivers as part of their scientific payload. do not only provide the position time for magnetic field measurements, but are also used determining non-gravitational forces like drag radiation pressure acting spacecraft. measure these directly, at much finer resolution than receivers, from which thermospheric neutral densities can be derived. Unfortunately, acceleration measurements suffer a variety...
Abstract. Atmospheric gravity waves (GWs) are essential for the dynamics of middle atmosphere. Recent studies have shown that these also important thermosphere/ionosphere (T/I) system. Via vertical coupling, GWs can significantly influence mean state T/I However, penetration into system is not fully understood in modeling as well observations. In current study, we analyze correlation between GW momentum fluxes observed atmosphere (30–90 km) and GW-induced perturbations T/I. atmosphere,...
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...
This paper presents a review on the PECASUS service, which provides advisories enhanced space weather activity for civil aviation. The are tailored according to Standards and Recommended Practices of International Civil Aviation Organization (ICAO). Advisories disseminated in three impact areas: radiation levels at flight altitudes, GNSS-based navigation positioning, HF communication. review, is based experiences authors from two years running pilot ICAO services, describes empirical models...
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,...
[1] Thermospheric density simultaneously observed by the CHAMP and GRACE satellites in both pre-dawn afternoon local time sectors undergoes significant decrease across hemispheres during major stratospheric sudden warming (SSW) January 2009. This is largest equatorial region near subsolar latitude, reaching ∼30% at 325 km, 45% 475 km altitude sector. large drop demonstrates a substantial cooling of about 50 Kelvin upper thermosphere. Furthermore, varies clearly with longitude terms magnitude...
[1] Using ground observations of total electron content (TEC) and equatorial electrojet (EEJ) in the Asian sector, along with plasma neutral densities obtained from CHAMP satellite, we investigate ionospheric electrodynamics background this longitude sector during major stratospheric sudden warming (SSW) January 2009. Our analysis reveals following prominent features. First, TEC response tropical regions is strongly latitude dependent, monotonic depletion at dip equator but a semidiurnal...
Abstract We present a case study of the 5 April 2010 geomagnetic storm using observations and numerical simulations. The event was driven by fast‐moving coronal mass ejection despite being moderate with minimum Dst near −50 nT, exhibited elevated thermospheric density surges traveling atmospheric disturbances (TADs) more typically seen during major storms. Thermosphere‐Ionosphere‐Mesosphere‐Electrodynamics General Circulation Model (TIMEGCM) used to assess how these features were generated...
Abstract Vertical coupling between the lower and middle thermosphere due to eastward propagating diurnal tide with zonal wave number 3 (DE3) 3.5 day ultra‐fast Kelvin Wave (UFKW) is investigated using Thermosphere, Ionosphere, Mesosphere, Energetics Dynamics‐Sounding of Atmosphere Broadband Emission Radiometry (TIMED‐SABER) temperatures near 100 km Gravity field steady‐state Ocean Circulation Explorer (GOCE) neutral densities winds 260 km. The analysis performed ±45 ∘ latitude during 2011,...
Abstract. Although the knowledge of gravity Earth has improved considerably with CHAMP, GRACE, and GOCE (see appendices for a list abbreviations) satellite missions, geophysical community identified need continued monitoring time-variable component purpose estimating hydrological glaciological yearly cycles long-term trends. Currently, GRACE-FO satellites are sole dedicated provider these data, while previously GRACE mission fulfilled that role 15 years. There is data gap spanning from July...
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...
The Carrington event of September 1859 is the best known example an extreme geomagnetic storm, often cited when discussing space weather risks for modern infrastructure. Historic observations including auroral sightings, magnetometer records and anecdotes impacts on telegraph systems have been widely shared before, but none these included from Netherlands. Geomagnetic taken in Utrecht Den Helder during were digitised Royal Netherlands Meteorological Institute’s (KNMI) yearbook 1859, compared...
Abstract Anthropogenic greenhouse gas emissions significantly impact the middle and upper atmosphere. They cause cooling thermal shrinking affect atmospheric structure. Atmospheric contraction results in changes key features, such as stratopause height or peak ionospheric electron density, also reduced thermosphere density. These can impact, among others, lifespan of objects low Earth orbit, refraction radio communication GPS signals, altitudes meteoroids entering Earth's Given this, there...