A5019938271- Ionosphere and magnetosphere dynamics
- GNSS positioning and interference
- Geophysics and Gravity Measurements
- Earthquake Detection and Analysis
- Spacecraft Design and Technology
- Space exploration and regulation
- Radiation Detection and Scintillator Technologies
- Solar and Space Plasma Dynamics
- Meteorological Phenomena and Simulations
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Target Tracking and Data Fusion in Sensor Networks
- Astronomical Observations and Instrumentation
- Soil Moisture and Remote Sensing
- Radio Wave Propagation Studies
- Astrophysics and Cosmic Phenomena
- Satellite Communication Systems
- Oil, Gas, and Environmental Issues
- Mobile and Web Applications
- Maritime Navigation and Safety
- Arctic and Antarctic ice dynamics
- Ocean Waves and Remote Sensing
- Methane Hydrates and Related Phenomena
- Radioactivity and Radon Measurements
- Infrared Target Detection Methodologies
- Planetary Science and Exploration
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2015-2023
Institute of Solar-Terrestrial Physics
2022-2023
Institute for Magnetospheric Physics
2023
University of Massachusetts Lowell
2017
University College London
2017
Istituto Nazionale di Geofisica e Vulcanologia
2017
Abstract On 6 September 2017, an X‐class flare of the magnitude 9.3 occurred around noon UT, being strongest event in a decade. The itself was highlight quite interesting phase solar‐terrestrial interactions caused by active region known as Catania sunspot group 46 or number 2673 on NOAA catalog. From 3 to 13 2017 strong activities occurred, accompanied radio bursts and earthward‐directed coronal mass ejections. Solar wind influences at Earth were modest during activity limited polar regions...
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 solar eclipse on March 20, 2015 was a fascinating event for people in Northern Europe. From scientific point of view, the can be considered as an situ experiment Earth's upper atmosphere with well-defined switching off and irradiation. Due to strong changes radiation during eclipse, dynamic processes were initiated ionosphere causing measurable impact, example, temperature ionization. We analyzed behavior total ionospheric ionization over Europe by reconstructing electron content (TEC)...
Space weather can strongly affect trans-ionospheric radio signals depending on the used frequency. In order to assess strength of a space event from its origin at sun towards impact ionosphere number physical quantities need be derived scientific measurements. These are for example Wolf sunspot index, solar flux density F10.7, measurements interplanetary magnetic field, proton density, wind speed, dynamical pressure, geomagnetic indices Auroral Electrojet, Kp, Ap and Dst as well Total...
Abstract The ionospheric Nighttime Winter Anomaly (NWA) was first reported more than three decades ago based on total electron content (TEC) and vertical sounding data. aim of this paper is to provide further evidence that the NWA effect a persistent feature in Northern Hemisphere at American Southern Asian longitude sector under low solar activity conditions. analysis ground‐based GPS derived TEC peak density data from radio occultation measurements Formosat‐3/COSMIC satellites confirms...
A signal, such as from a GNSS satellite or microwave sounding system, propagating in the randomly inhomogeneous ionosphere, experiences chaotic modulations of its amplitude and phase. This effect is known scintillation. article reviews basic theoretical concepts simulation strategies for modeling scintillation phenomenon. We focused our attention primarily on methods connected with random phase screen model. For weak scattering regime ionospheric irregularities, single-phase model enables us...
Abstract. Small-scale ionospheric disturbances may cause severe radio scintillations of signals transmitted from global navigation satellite systems (GNSSs). Consequently, small-scale plasma irregularities heavily degrade the performance current GNSSs such as GPS, GLONASS or Galileo. This paper presents analysis results obtained primarily two high-rate GNSS receiver stations designed and operated by German Aerospace Center (DLR) in cooperation with Bahir Dar University (BDU) at 11.6° N,...
Since its launch in 2013, ESA’s Swarm satellite constellation has pushed the frontiers of space weather research and monitoring by means broad spectrum high-quality experiments on-board. Particularly, observations are being used to globally characterize small- mid-scale perturbations topside ionosphere that may cause severe amplitude phase scintillations trans-ionospheric radio signals. Ionospheric scintillation can signal outage, as well disruption modern technological systems for...
Abstract Enhanced scintillation activities observed at transionospheric radio signals are often correlated with slant total electron content (STEC) depletions in the equatorial ionosphere. In this study, data derived from high‐rate Global Navigation Satellite System (GNSS) receivers were used to analyze STEC depletions, commonly associated plasma bubbles causing scintillations We found that depletion can be described by a wedge‐shaped structure. To quantitatively describe structure of we...
Transionospheric radio signals might undergo random modulations of their amplitude and phase caused by scattering on irregular structures in the ionosphere. These scintillation phenomena are highly anisotropic, depend local geomagnetic field configuaration relative position signal receiver irregularity. We derive analytical expressions anisotropic indices using model a thin screen. results extend classical derivations [C. Rino, Radio Sci. 14, 1135 (1979)] to larger domain applicability...
The solar terminator is a moving boundary between day-side and night-side regions on the Earth, which substantial source of perturbations in ionosphere. In vicinity terminator, essential parameters like S4 index measurements are widely analyzed order to monitor predict utilization scintillation well-accepted approach describe amplitude/intensity fluctuation received signal, predominantly caused by small-scale irregularities ionospheric plasma. We report longitudinal daily seasonal occurrence...
This work shows a 20-month statistical evaluation of different Total Electron Content (TEC) estimators for the Central and South America regions. The TEC provided by International GNSS Service (IGS) in area covered around monitoring stations are used as reference values, they compared to estimates from physics-based (Sheffield University Plasmasphere Ionosphere Model—PIM) empirical (Neustrelitz Model-Global—NTCM-GL) models. mean values show strong dependence on both solar activity seasonal...
Within the European Space Agency's (ESA) Weather Service Network, development of performance indicators for Global Navigation Satellite System (GNSS) has been identified as essential to meet growing needs end users information in field navigation. This requires a targeted analysis Weather-related disturbances technical systems and services satellite-based navigation, considering requirements all different this domain. The goal Impact on GNSS Performance: Application Development (SWIGPAD)...
Given the ever-increasing demands for accuracy, reliability, availability and safety of modern radio systems in telecommunications navigation, need to establish ionospheric information data services connection with space weather is beyond question. The Department Space Weather Impacts newly founded DLR Institute Solar- Terrestrial Physics investigates influence on crucial such as GNSS or HF communication well ground based infrastructures power grids satellites. This includes operation...
Multiple studies of scintillation phenomena have shown that, in certain situations, the intense phase fluctuations trans-ionospheric radio signals are associated with scattering on strong electron density gradients. The present study provides a theoretical framework for modeling such type fluctuation events. Using geometrical-optics approximation and retaining second-order smallness correction expansion eikonal function, we relate transmitted wave not only to total content (TEC) ionosphere...
In this paper an analysis of scintillation phase and amplitude from measurement data with a new dual smoother scheme is performed. The was obtained in Fortaleza, Brazil, during ionospheric event April 2016. Ionospheric scintillations affect the global navigation satellite system’s (GNSS) signal phase. Both, amplitude, are temporally correlated stochastic processes which can severely disturb tracking if not considered process. To overcome problem, statistics be modeled as auto-regressive...
<p>The PECASUS Consortium (European for Aviation Space weather User Services) provides targeted space services focusing on the dissemination of warning messages, called 'advisories', towards aviation actors. corresponds to extreme events with impact GNSS systems, HF communication and radiation levels at flight altitudes. In November 2018 ICAO (International Civil Organization) designated three global service centers. These centers acre operated by European consortium, United...
The development of operational ICAO Space Weather Center to support aviation community has made significant progress during the last two years, resulting in start a continuous service on 07. November 2019. Although this is recently most advanced space weather terms operability and forecasting, there still important research ahead address need different stakeholders use-cases domain. Especially impact spatial temporal ionospheric gradients as caused by small scale irregularities or storms...