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Member Since 2009
Sigrid Close
Associate Professor, Stanford University
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Meteor Head Echo Detection at Multiple High‐Power Large‐Aperture Radar Facilities via a Convolutional Neural Network Trained on Synthetic Radar Data
JOURNAL OF GEOPHYSICAL RESEARCH: SPACE PHYSICS
28 march 2024
Trevor Hedges, Nicolas Lee, Sigrid Close
High‐power large‐aperture radar instruments are capable of detecting thousands of meteor head echoes within hours of observation, and m...
Meteor Head Echo Observations at Multiple High-Power Radar Facilities Detected via a Convolutional Neural Network Trained on Synthetic Data
PLANETARY RINGS, METEOROID AND DUST POPULATIONS, AND EFFECTS II POSTER
planetary sciences | 11 december 2023
Trevor Hedges, Nicolas Lee, Sigrid Close
High-power large-aperture (HPLA) radar instruments are capable of detecting thousands of meteors in timespans of hours. Their radar signatures, includ...
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Time‐Dependent Inversion of Energetic Electron Precipitation Spectra From Ground‐Based Incoherent Scatter Radar Measurements
JOURNAL OF GEOPHYSICAL RESEARCH: SPACE PHYSICS
08 may 2023
Diana Juarez Madera, Robert A. Marshall, Sigrid Cl...
In the D‐region, the ionization rate cannot be detected directly with any known measurement technique, therefore it must be estimated. Starti...
Improving the Physical Accuracy of 3D Particle-In-Cell Simulation of the Plasma Surrounding an Ablating Meteoroid via Simulated Ablation Physics
PLANETARY RINGS, METEOROID AND DUST POPULATIONS, AND EFFECTS I ORAL
planetary sciences | 14 december 2022
Trevor Hedges, Joseph Ferguson, Nicolas Lee, Sigri...
Meteor plasma head echoes are frequently observed by high-power large-aperture (HPLA) radars around the world. To meaningfully deduce meteoroid proper...
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Meteor Head Echo Analyses From Concurrent Radar Observations at AMISR Resolute Bay, Jicamarca, and Millstone Hill
JOURNAL OF GEOPHYSICAL RESEARCH: SPACE PHYSICS
06 october 2022
Trevor Hedges, Nicolas Lee, Sigrid Close
On 10 and 11 October 2019, high‐power radar observations were performed simultaneously for 8 hours at Resolute Bay Incoherent Scatter No...
Effect of Upper Thermosphere Flight on Meteoroid Ablation and Deceleration Prior to Radar Detection
COMPOSITION, WIND, AND TEMPERATURE VARIABILITY IN THE MESOSPHERE AND IONOSPHERE/THERMOSPHERE II ORAL
spa-aeronomy | 17 december 2021
Nicolas Lee, Sigrid Close
Meteoroids entering the Earth's thermosphere form meteors primarily between 80 and 120 km altitude. High-power large-aperture (HPLA) radar facilities ...
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Pushing the Boundaries of 3D Particle-In-Cell Simulations of the Plasma Surrounding an Ablating Meteoroid
PLANETARY RINGS, METEOROID AND DUST POPULATIONS, AND EFFECTS II POSTER
planetary sciences | 15 december 2021
Trevor Hedges, Sigrid Close, Meers M. Oppenheim, G...
Meteor plasma head echoes are frequently observed by high-power large-aperture (HPLA) radar, but to meaningfully deduce meteoroid properties from rada...
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Simulation‐Derived Radar Cross Sections of a New Meteor Head Plasma Distribution Model
JOURNAL OF GEOPHYSICAL RESEARCH: SPACE PHYSICS
30 june 2021
Glenn Sugar, Robert A. Marshall, Meers M. Oppenhei...
We present results and analysis of finite‐difference time‐domain (FDTD) simulations of electromagnetic waves scattering off meteor head...