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Works (49)

Ionospheric Conductance Derived from Satellite Measurments: Limitations and Implications

2025-01-20 | Preprint
Contributors: Pouya Pourkarim; David Knudsen
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Ten Years of Low-Earth Orbit Observations from CASSIOPE/Swarm-Echo

2025-01-20 | Preprint
Contributors: Andrew Howarth; Andrew Yau; Paul Bernhardt; Gordon James; David Knudsen; Richard Langley; David Miles
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Crossref

Unexpected STEVE Observations at High Latitude During Quiet Geomagnetic Conditions

Geophysical Research Letters
2024-10-16 | Journal article
Contributors: B. Gallardo‐Lacourt; Y. Nishimura; L. Kepko; E. L. Spanswick; D. M. Gillies; D. J. Knudsen; J. K. Burchill; S. H. Skone; V. A. Pinto; D. Chaddock et al.
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Does high-latitude ionospheric electrodynamics exhibit hemispheric mirror symmetry?

Annales Geophysicae
2024-06-04 | Journal article
Contributors: Spencer Mark Hatch; Heikki Vanhamäki; Karl Magnus Laundal; Jone Peter Reistad; Johnathan K. Burchill; Levan Lomidze; David J. Knudsen; Michael Madelaire; Habtamu Tesfaw
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Power Spectral Characteristics of In‐Situ Irregularities and Topside GPS Signal Intensity at Low Latitudes Using High‐Sample‐Rate Swarm Echo (e‐POP) Measurements

Radio Science
2024-05 | Journal article
Contributors: Ali Mohandesi; David J. Knudsen; Susan Skone; Richard B. Langley; Andrew W. Yau
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What is the neutral wind in height-integrated ionospheric electrodynamics?

2024-05-03 | Preprint
Contributors: Spencer Mark Hatch; Johnathan K. Burchill; Heikki Vanhamäki; Rafael Luiz Araujo de Mesquita; Karl Laundal; David J. Knudsen
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Leroy L. Cogger: A Pioneer in Optical Observations From Space

Perspectives of Earth and Space Scientists
2023-12 | Journal article
Contributors: Andrew W. Yau; Andrew D. Howarth; David J. Knudsen; J. Sandy Murphree; Trond S. Trondsen
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Does high-latitude ionospheric electrodynamics exhibit hemispheric mirror symmetry?

2023-12-06 | Preprint
Contributors: Spencer Mark Hatch; Heikki Vanhamäki; Karl Magnus Laundal; Jone Peter Reistad; Johnathan Burchill; Levan Lomidze; David Knudsen; Michael Madelaire; Habtamu Tesfaw
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Crossref

Post‐Sunset Field‐Line Resonances at Equatorial Latitudes Observed by Swarm

Geophysical Research Letters
2023-07-28 | Journal article
Contributors: Hossein Ghadjari; David Knudsen; Susan Skone
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Regional Mapping of Small‐Scale Equatorial Ionospheric Irregularities Using Swarm Echo Satellite Measurements

Space Weather
2023-06 | Journal article
Contributors: Ali Mohandesi; David J. Knudsen; Susan Skone; Richard B. Langley; Andrew W. Yau
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Equinoctial Asymmetry in the Upper Ionosphere: Comparison of Satellite Observations and Models

Journal of Geophysical Research: Space Physics
2023-05 | Journal article
Contributors: L. Lomidze; D. J. Knudsen; M. Shepherd; J. D. Huba; A. Maute
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Multi‐Scale Ionospheric Poynting Fluxes Using Ground and Space‐Based Observations

Geophysical Research Letters
2023-05-28 | Journal article
Contributors: D. D. Billett; K. A. McWilliams; P. V. Ponomarenko; C. J. Martin; D. J. Knudsen; S. K. Vines
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Probability distribution of integrated power of equatorial ionosphere plasma density fluctuations measured by the Swarm Langmuir probes

2023-05-15 | Preprint
Contributors: Hossein Ghadjari; David Knudsen; Susan Skone
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Swarm Electric Field Instruments' Thermal Ion Imagers: A Decade of Discovery

2023-05-15 | Preprint
Contributors: David Knudsen; Johnathan Burchill
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Multi-Scale Ionospheric Poynting Fluxes Using Ground and Space-Based Observations

2023-03-26 | Preprint
Contributors: Daniel D Billett; Kathryn A McWilliams; Pavlo V. Ponomarenko; Carley Jade Martin; David J. Knudsen; Sarah Kimberly Vines
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High‐Resolution Poynting Flux Statistics From the Swarm Mission: How Much Is Being Underestimated at Larger Scales?

Journal of Geophysical Research: Space Physics
2022-07 | Journal article
Contributors: D. D. Billett; K. A. McWilliams; I. P. Pakhotin; J. K. Burchill; D. J. Knudsen; C. J. Martin
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Altitude Distribution of Large and Small‐Scale Equatorial Ionospheric Irregularities Sampled From an Elliptical Low‐Earth Orbit

Journal of Geophysical Research: Space Physics
2022-06 | Journal article
Contributors: Ali Mohandesi; David J. Knudsen; Susan Skone; Richard B. Langley; Andrew W. Yau
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Rainbow of the Night: First Direct Observation of a SAR Arc Evolving Into STEVE

Geophysical Research Letters
2022-06-16 | Journal article
Contributors: C. Martinis; I. Griffin; B. Gallardo‐Lacourt; J. Wroten; Y. Nishimura; J. Baumgardner; D. J. Knudsen
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High-resolution Poynting Flux Statistics from the Swarm Mission: How Much is Being Underestimated at Larger Scales?

2022-04-22 | Preprint
Contributors: Daniel D Billett; Kathryn A McWilliams; Ivan P Pakhotin; Johnathan K. Burchill; David J. Knudsen; Carley Jade Martin
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Standing Alfvén Waves Within Equatorial Plasma Bubbles

Geophysical Research Letters
2022-04-16 | Journal article
Contributors: Hossein Ghadjari; David Knudsen; Susan Skone
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Estimation of Ion Temperature in the Upper Ionosphere Along the Swarm Satellite Orbits

Earth and Space Science
2021-11 | Journal article
Contributors: L. Lomidze; J. K. Burchill; D. J. Knudsen; J. D. Huba
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Swarm Observations of Dawn/Dusk Asymmetries Between Pedersen Conductance in Upward and Downward Field‐Aligned Current Regions

Earth and Space Science
2021-07 | Journal article
Contributors: L. Olifer; C. Feltman; R. Ghaffari; S. Henderson; D. Huyghebaert; J. Burchill; A. N. Jaynes; D. Knudsen; K. McWilliams; J. I. Moen et al.
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Evolution of Mid‐latitude Density Irregularities and Scintillation in North America During the 7–8 September 2017 Storm

Journal of Geophysical Research: Space Physics
2021-06 | Journal article
Contributors: Y. Nishimura; S. Mrak; J. L. Semeter; A. J. Coster; P. T. Jayachandran; K. M. Groves; D. J. Knudsen; N. Nishitani; J. M. Ruohoniemi
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Birkeland Current Boundary Flows Associated With Field Line Resonances

Journal of Geophysical Research: Space Physics
2021-03 | Journal article
Contributors: F. R. Fenrich; R. Rankin; D. Sydorenko; W. E. Archer; D. J. Knudsen
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The Diffuse Auroral Eraser

Journal of Geophysical Research: Space Physics
2021-03 | Journal article
Contributors: R. N. Troyer; A. N. Jaynes; S. L. Jones; D. J. Knudsen; T. S. Trondsen
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Editorial: Topical Collection on Auroral Physics

Space Science Reviews
2021-02 | Journal article
Contributors: David J. Knudsen; Joseph E. Borovsky; Tomas Karlsson; Ryuho Kataoka; Noora Partamies
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e‐POP Observations of Suprathermal Electron Bursts in the Ionospheric Alfvén Resonator

Journal of Geophysical Research: Space Physics
2021-02 | Journal article
Contributors: J. Wu; D. J. Knudsen; Y. Shen; D. M. Gillies
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Effects of Ion Slippage in Earth's Ionosphere and the Plasma Sheet

Geophysical Research Letters
2021-02-16 | Journal article
Contributors: Wenrui Wang; Jian Yang; Yukitoshi Nishimura; Richard A. Wolf; Frank R. Toffoletto; Vassilis Angelopoulos; David J. Knudsen; Eric F. Donovan; Jun Cui
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Observational Evidence for the Role of Hall Conductance in Alfvén Wave Reflection

Journal of Geophysical Research: Space Physics
2020-12 | Journal article
Contributors: Magnus F. Ivarsen; Jaeheung Park; Young‐Sil Kwak; Yaqi Jin; David J. Knudsen; Lasse B. N. Clausen
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On O+ Ion Heating by BBELF Waves at Low Altitude: Test Particle Simulations

Journal of Geophysical Research: Space Physics
2020-08 | Journal article
Contributors: Yangyang Shen; David J. Knudsen
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Potential Evidence of Low‐Energy Electron Scattering and Ionospheric Precipitation by Time Domain Structures

Geophysical Research Letters
2020-08-28 | Journal article
Contributors: Yangyang Shen; Anton Artemyev; Xiao‐Jia Zhang; Ivan Y. Vasko; Andrei Runov; Vassilis Angelopoulos; David Knudsen
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The Diffuse Auroral Eraser

2020-07-07 | Other
Contributors: Riley N Troyer; Allison N Jaynes; Sarah L Jones; David J. Knudsen; Trond Steinar Trondsen
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Dayside Field‐Aligned Current Impacts on Ionospheric Irregularities

Geophysical Research Letters
2020-06-16 | Journal article
Contributors: A. Fæhn Follestad; K. Herlingshaw; H. Ghadjari; D. J. Knudsen; K. A. McWilliams; J. I. Moen; A. Spicher; J. Wu; Kjellmar Oksavik
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Observational evidence for the role of Hall conductance in Alfvén wave reflection

2020-04-25 | Other
Contributors: Magnus Fagernes Ivarsen; Jaeheung Park; Young-Sil Kwak; Yaqi Jin; David J. Knudsen; Lasse Boy Novock Clausen
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Swarm Survey of Alfvénic Fluctuations and Their Relation to Nightside Field‐Aligned Current and Auroral Arc Systems

Journal of Geophysical Research: Space Physics
2020-03 | Journal article
Contributors: J. Wu; D. J. Knudsen; D. M. Gillies; J. K. Burchill
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Quiescent Discrete Auroral Arcs: A Review of Magnetospheric Generator Mechanisms

Space Science Reviews
2020-02 | Journal article
Contributors: Joseph E. Borovsky; Joachim Birn; Marius M. Echim; Shigeru Fujita; Robert L. Lysak; David J. Knudsen; Octav Marghitu; Antonius Otto; Tomo-Hiko Watanabe; Takashi Tanaka
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Suprathermal Electron Acceleration Perpendicular to the Magnetic Field in the Topside Ionosphere

Journal of Geophysical Research: Space Physics
2020-02 | Journal article
Contributors: Yangyang Shen; David J. Knudsen
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A Comparison of Cross‐Track Ion Drift Measured by the Swarm Satellites and Plasma Convection Velocity Measured by SuperDARN

Journal of Geophysical Research: Space Physics
2019-06 | Journal article
Contributors: A. V. Koustov; D. B. Lavoie; A. F. Kouznetsov; J. K. Burchill; D. J. Knudsen; R.A.D. Fiori
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e‐POP and Red Line Optical Observations of Alfvénic Auroras

Journal of Geophysical Research: Space Physics
2019-06 | Journal article
Contributors: Jun Liang; Y. Shen; D. Knudsen; E. Spanswick; J. Burchill; E. Donovan
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Flow Velocity and Field‐Aligned Current Associated With Field Line Resonance: SuperDARN Measurements

Journal of Geophysical Research: Space Physics
2019-06 | Journal article
Contributors: Frances R. Fenrich; D. Megan Gillies; Eric Donovan; David Knudsen
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Magnetospheric Signatures of STEVE: Implications for the Magnetospheric Energy Source and Interhemispheric Conjugacy

Geophysical Research Letters
2019-06-16 | Journal article
Contributors: Y. Nishimura; B. Gallardo‐Lacourt; Y. Zou; E. Mishin; D. J. Knudsen; E. F. Donovan; V. Angelopoulos; R. Raybell
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Validity Study of the Swarm Horizontal Cross‐Track Ion Drift Velocities in the High‐Latitude Ionosphere

Earth and Space Science
2019-03 | Journal article
Contributors: Levan Lomidze; Johnathan K. Burchill; David J. Knudsen; Alexei Kouznetsov; Daniel R. Weimer
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Swarm Satellite and EISCAT Radar Observations of a Plasma Flow Channel in the Auroral Oval Near Magnetic Midnight

Journal of Geophysical Research: Space Physics
2018-06 | Journal article
Contributors: A. T. Aikio; H. Vanhamäki; A. B. Workayehu; I. I. Virtanen; K. Kauristie; L. Juusola; S. Buchert; D. Knudsen
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A Statistical Survey of the 630.0‐nm Optical Signature of Periodic Auroral Arcs Resulting From Magnetospheric Field Line Resonances

Geophysical Research Letters
2018-05-28 | Journal article
Contributors: D. Megan Gillies; David Knudsen; Robert Rankin; Stephen Milan; Eric Donovan
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Low‐Altitude Ion Heating, Downflowing Ions, and BBELF Waves in the Return Current Region

Journal of Geophysical Research: Space Physics
2018-04 | Journal article
Contributors: Yangyang Shen; David J. Knudsen; Johnathan K. Burchill; Andrew D. Howarth; Andrew W. Yau; David M. Miles; H. Gordon James; Gareth W. Perry; Leroy Cogger
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Calibration and Validation of Swarm Plasma Densities and Electron Temperatures Using Ground‐Based Radars and Satellite Radio Occultation Measurements

Radio Science
2018-01 | Journal article
Contributors: Levan Lomidze; David J. Knudsen; Johnathan Burchill; Alexei Kouznetsov; Stephan C. Buchert
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Diagnosing the Role of Alfvén Waves in Magnetosphere‐Ionosphere Coupling: Swarm Observations of Large Amplitude Nonstationary Magnetic Perturbations During an Interval of Northward IMF

Journal of Geophysical Research: Space Physics
2018-01 | Journal article
Contributors: I. P. Pakhotin; I. R. Mann; R. L. Lysak; D. J. Knudsen; J. W. Gjerloev; I. J. Rae; C. Forsyth; K. R. Murphy; D. M. Miles; L. G. Ozeke et al.
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Distinguishing Subauroral Ion Drifts From Birkeland Current Boundary Flows

Journal of Geophysical Research: Space Physics
2018-01 | Journal article
Contributors: W. E. Archer; D. J. Knudsen
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Alfvénic Dynamics and Fine Structuring of Discrete Auroral Arcs: Swarm and e‐POP Observations

Geophysical Research Letters
2018-01-28 | Journal article
Contributors: D. M. Miles; I. R. Mann; I. P. Pakhotin; J. K. Burchill; A. D. Howarth; D. J. Knudsen; R. L. Lysak; D. D. Wallis; L. L. Cogger; A. W. Yau
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