A5080008694- Ionosphere and magnetosphere dynamics
- Earthquake Detection and Analysis
- Geomagnetism and Paleomagnetism Studies
- Solar and Space Plasma Dynamics
- GNSS positioning and interference
- Geophysics and Gravity Measurements
- Methane Hydrates and Related Phenomena
- Soil Moisture and Remote Sensing
- Ocean Waves and Remote Sensing
- Atmospheric Ozone and Climate
- Calibration and Measurement Techniques
- Atmospheric and Environmental Gas Dynamics
- Astro and Planetary Science
- Coastal and Marine Dynamics
- Solar Radiation and Photovoltaics
- Radio Wave Propagation Studies
- Seismology and Earthquake Studies
- Astrophysics and Cosmic Phenomena
- Geochemistry and Geologic Mapping
- Underwater Vehicles and Communication Systems
- Atomic and Subatomic Physics Research
- Statistical and numerical algorithms
National Oceanic and Atmospheric Administration
2025
Technical University of Denmark
2016-2020
Jet Propulsion Laboratory
2017
Abstract The geomagnetic storm of 17–18 March 2015 was caused by the impacts a coronal mass ejection and high‐speed plasma stream from hole. high‐latitude ionosphere dynamics is studied using arrays ground‐based instruments including GPS receivers, HF radars, ionosondes, riometers, magnetometers. phase scintillation index computed for signals sampled at rate up to 100 Hz specialized receivers supplemented proxy obtained geodetic‐quality data 1 Hz. In context solar wind coupling...
The mission of NOAA’s Space Weather Prediction Center (SWPC) is to provide space weather products and services stakeholders by issuing alerts, watches, warnings. For the satellite GNSS users, different thermosphere ionospheric have been developed. These ionosphere-thermosphere are based on first-principle data-assimilative models. To operate stable 24/7, gone through long cycles development, verification, validation. Once in operation, need be continuously evaluated assess their...
Abstract This study presents an assessment of scintillation observations obtained from PlanetiQ and Spire Global commercial CubeSat constellation radio occultation (RO) missions. A conservative algorithm is developed to detect distinguish ionospheric other scintillation‐like features in the RO measurements. Identified events are compared with independent instruments including ground‐based Navigation Satellite System monitors Constellation Observing for Meteorology, Ionosphere, Climate‐2...
Abstract We present a multiinstrumented approach for the analysis of Arctic ionosphere during 19 February 2014 highly complex, multiphase geomagnetic storm, which had largest impact on disturbance storm‐time index that year. The storm was result two powerful Earth‐directed coronal mass ejections (CMEs). It produced strong long lasting negative phase over Greenland with dominant energy input in polar cap. employed global navigation satellite system (GNSS) networks, observatories, and specific...
Abstract This paper presents electron number density profiles derived from high‐resolution Global Positioning System (GPS) radio occultation (RO) observations performed using the Enhanced Polar Outflow Probe payload on high inclination CAScade, Smallsat and IOnospheric Explorer (CASSIOPE) spacecraft. We have developed applied a novel inverse Abel transform algorithm rate RO total content measurements along GPS to CASSIOPE links recover profiles. The inferred are (1) in very good agreement...
A new wave propagator that can be used to simulate global navigation satellite systems reflected signals from ocean surfaces is presented. The simulates the characteristics of a bistatic scattering system. Simulated GPS surface reflections will presented and discussed based on different characteristics. spectra simulated are analyzed, results simulations compared measured reflections. measurements were performed using space-qualified receiver placed mountain at Haleakala observatory Hawaiian...
Abstract The processing of measurement data from satellite constellations such as Global Navigation Satellite Systems (GNSS), including the well-known Positioning System (GPS), have been successfully applied to virtually all areas geophysical sciences. In this work, a method is described where Geographical Information (GIS) are employed build hourly ionospheric Total Electron Content (TEC) maps for 2011 over southern Iberian Peninsula. used GPS-derived geometryfree linear combinations...
This study explores the intricate relationship between spectral irradiance variations and polar cap mean vertical total electron content (MVTEC) climatology, using ground-based GNSS measure-ments from Thule station in Arctic. The analysis focuses on understanding how different solar magnetospheric processes drive changes MVTEC patterns over a 2-year period. Three primary factors are identified as key drivers of variations: (1) Russell-McPherron Effect: During equinoxes, enhanced energy...
Interplanetary coronal mass ejections (ICMEs) compounded by high-speed plasma streams from holes caused two intense geomagnetic storms on March 17-18, 2013 and 2015 during the current solar cycle. Ionospheric responses to in northern southern hemispheres are compared context of wind coupling magnetosphere-ionosphere system. Phase scintillation is observed at high latitudes arrays high-rate GNSS Scintillation TEC Monitors (GISTMs) geodetic-quality GPS receivers sampling 1 Hz. The distributed...