The Department of Physical Sciences is home to several degree programs: Bachelor of Science in Astronomy & AstrophysicsBachelor of Science in Engineering PhysicsBachelor of Science in Space PhysicsMaster of Science in Engineering Physics; and Doctor of Philosophy in Engineering Physics.

The programs offer a unique balance of engineering and physics curriculum, so students can focus on the scientific challenges and planning associated with mission design and space exploration, along with engineering fundamentals.

These programs prepare students to make positive scientific and technological contributions to our increasingly complex society. This highly research-oriented department has one of the oldest and largest Engineering Physics programs in the nation. Students are involved in all the research, which includes grants funded by NASA, the National Security Agency (NSA), and other agencies.

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Submissions from 2022

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Resonant Alfvén Waves in the Lower Auroral Ionosphere: Evidence for the Nonlinear Evolution of the Ionospheric Feedback Instability, Hassanali Akbari, Anatoly Streltsov, Robert Pfaff, James Clemmons, Henry Freudenreich, and Douglas Rowland

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Feedback Interactions Between the Ionosphere and Magnetosphere at Middle Latitude, Mergen Alimaganbetov and Anatoly Streltsov

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Rocket Measurements of Electron Energy Spectra From Earth’s Photoelectron Production Layer, Aroh Barjatya, Shantanab Debchoudhury, Glyn A. Collinson, Alex Glocer, Dennis Chornay, and Et al.

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The Endurance Rocket Mission, Glyn Collinson, Aroh Barjatya, Robert Clayton, Nathan Graves, Henry Valentine, and et. al.

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Comparison of MLT Momentum Fluxes Over the Andes at Four Different Latitudinal Sectors Using Multistatic Radar Configurations, J. Federico Conte, Alan Liu, Zishun Qiao, Jorge L. Chau, David C. Fritts, José L. Hormaechea, Jacobo O. Salvador, and Marco A. Milla

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Oxygen Ion Escape at Venus Associated With Three-Dimensional Kelvin-Helmholtz Instability, Tong Dang, Xuanye Ma, Jiuhou Le, Binzheng Zhang, Tielong Zhang, Zhonghua Yao, John Lyon, Sudong Xiao, Maodong Yan, Oliver Brambles, and Kareem Sorathia

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Climatology of Deep O+ Dropouts in the Night-Time F-Region in Solar Minimum Measured by a Langmuir Probe Onboard the International Space Station, Shantanab Debchoudhury, Aroh Barjatya, Joseh I. Minow, Victoria N. Coffey, and Linda N. Parker

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3D Numerical Simulation of Secondary Wave Generation From Mountain Wave Breaking Over Europe, Christopher J. Heale, Katrina Bossert, and Sharon L. Vadas

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Venus Mountain Waves in the Upper Atmosphere Simulated by A Time-Invariant Linear Full-Wave Spectral Model, Michael P. HIckey, Richard L. Walterscheid, Thomas Navarro, and Gerald Schubert

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Simulation of Infrasonic Acoustic Wave Imprints on Airglow Layers During the 2016 M7.8 Kaikoura Earthquake, P. A. Inchin, J. Aguilar Guerrero, J. B. Snively, and Y. Kaneko

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Observations and Modeling of Scintillation in the Vicinity of a Polar Cap Patch, Leslie J. Lamarche, Kshitija B. Deshpande, and Matthew D. Zettergren

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Statistical Characteristics of High-frequency Gravity Waves Observed by an Airglow Imager at Andes Lidar Observatory, Alan Z. Liu and Bing Cao

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Anomalous Orbital Characteristics of the AQ Col (EC 05217-3914) System, Tomomi Otani, Anthony E. Lynas-Gray, David Kilkenny, Chris Koen, Ted von Hippel, Murat Uzundag, Maja Vuckovic, Clara Pennock, and Roberto Silvotti

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A Monte Carlo Method for Evaluating Empirical Gyrochronology Models and Its Application to Wide Binary Benchmarks, Tomomi Otani, Ted von Hippel, Derek Buzasi, Terry Oswalt, Alexander Stone-Martinez, and Patrice Majewski

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Revisit of Open Clusters Upk 39, Upk 41 and Phoc 39 : A New Binary Open Cluster Found, Xianhao Ye, Terry D. Oswalt, Jingkun Zhao, Yong Yang, and Gang Zhao

Submissions from 2021

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A Quasi-27-Day Oscillation Activity From the Troposphere to the Mesosphere And Lower Thermosphere at Low Latitudes, Hao Cheng, Alan Z. Liu, Kaiming Huang, Shaodong Zhang, Chunming Huang, and Yun Gong

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Observations and Validation of Plasma Density, Temperature, and O+ Abundance From a Langmuir Probe Onboard the International Space Station, Shantanab Debchoudhury, Aroh Barjatya, Joseph I. Minow, Victoria N. Coffey, and Michael O. Chandler

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Primary Versus Secondary Gravity Wave Responses at F-Region Heights Generated by a Convective Source, C. J. Heale, P. A. Inchin, and J. B. Snively

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Venus Mountain Waves in the Upper Atmosphere Simulated by a Time-Invariant Linear Full-Wave Spectral Model, Michael P. Hickey, Thomas Navarro, Gerald Schubert, and Richard L. Walterscheid

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Inferring the Evolution of a Large Earthquake from Its Acoustic Impacts on the Ionosphere, P. A. Inchin, J. B. Snively, M. D. Zettergren, Y. Kaneko, and A. Komjathy

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Modeling of Upper Atmospheric Responses to Acoustic-Gravity Waves Generated by Earthquakes and Tsunamis, Pavel Inchin, Jonathan Snively, Matthew D. Zettergren, Yoshihiro Kaneko, and Attila Komjathy

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Reduced-order Dynamic Modeling and Robust Nonlinear Control of Fluid Flow Velocity Fields, Anu Kossery Jayaprakash, William MacKunis, Vladimir Golubev, and Oksana Stalnov

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Corrigendum: The Remote Observatories of the Southeastern Association for Research in Astronomy (SARA), William C. Keel, Terry Oswalt, Peter Mack, Gary Henson, Todd Hillwig, Daniel Batcheldor, Robert Berrington, Chris De Pree, Dieter Hartmann, Martha Leake, Javier Licandro, Brian Murphy, James Webb, and Matt A. Wood

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Mosaic: A Satellite Constellation to Enable Groundbreaking Mars Climate System Science and Prepare for Human Exploration, Robert J. Lillis, Aroh Barjatya, David Mitchell, Luca Montabone, Nicholas Heavens, Tanya Harrison, Cassie Stuurman, Scott Guzewich, Scott England, Paul Withers, Mike Chaffin, Shannon Curry, Chi Ao, Steven Matousek, Nathan Barba, Ryan Woodley, Isaac Smith, Gordon R. Osinski, Armin Kleinböhl, Leslie Tamppari, Michael Mischna, David Kass, Michael Smith, Michael Wolff, Melinda Kahre, Aymeric Spiga, François Forget, Bruce Cantor, Justin Deighan, Amanda Brecht, Stephen Bougher, Christopher M. Fowler, David Andrews, Martin Patzold, Kerstin Peter, Silvia Tellmann, Mark Lester, Beatriz Sánchez-Cano, Janet Luhmann, François Leblanc, Jasper Halekas, David Brain, Xiaohua Fang, Jared Espley, Hermann Opgenoorth, Oleg Vaisberg, David Hinson, Sami Asmar, Joshua Vander Hook, Ozgur Karatekin, and Abhishek Tripathi

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Statistical Spectral Characteristics of Three-Dimensional Winds in the Mesopause Region Revealed by the Andes Lidar, Qian Li, Alan Z. Liu, Shao Dong Zhang, Chun Ming Huang, Kai Ming Huang, Yun Gong, Quan Gan, Yan Ying Yan, and Hang Liu

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Auroral Heating of Plasma Patches Due to High-Latitude Reconnection, Joaquin Diaz Pena, Joshua Semeter, Yukitoshi Nishimura, Roger Varney, Ashton Reimer, Marc Hairston, Matthew Zettergren, Michael Hirsch, Olga Verkhoglyadova, Keisuke Hosokawa, and Kazuo Shiokawa

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Atmospheric Tomography Using the Nordic Meteor Radar Cluster and Chilean Observation Network De Meteor Radars: Network Details and 3DVAR Retrieval, Gunter Stober, Alan Liu, Zishun Qiao, Alexander Kozlovsky, Masaki Tsutsumi, Chris Hall, Satonori Nozawa, Mark Lester, Evgenia Belova, Johan Kero, Patrick J. Espy, Robert E. Hibbins, and Nicholas Mitchell

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Atmospheric Tomography Using the Nordic Meteor Radar Cluster And Chilean Observation Network de Meteor Radars: Network Details and 3D-Var Retrieval, Gunter Stober, Alan Z. Liu, Zishun Qiao, Alexander Kozlovsky, Masaki Tsutsumi, Chris Hall, Satonori Nozawa, Mark Lester, Evgenia Belova, Johan Kero, Patrick J. Espy, Robert E. Hibbins, and Nicholas Mitchell

Submissions from 2020

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Evidence for Horizontal Blocking and Reflection of a Small-Scale Gravity Wave in the Mesosphere, N. R. Criddle, C. Heale, J. Snively, P. -D. Pautet, T. Yuan, Y. Zhao, and M. J. Taylor

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gravity waves, na lidar, Yafang Guo and Alan Z. Liu

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Secondary Gravity Waves Generated by Breaking Mountain Waves Over Europe, Christopher J. Heale, Jonathan B. Snively, Katrina Bossert, S. L. Vadas, Lars Hoffmann, A. Dörnbrack, G. Stober, and C. Jacobi

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Kelvin-Helmholtz Billow Interactions and Instabilities In The Mesosphere Over the Andes Lidar Observatory: 1. Observations, J. H. Hecht, R. L. Walterscheid, A. Z. Liu, D. C. Fritts, L. J. Gelinas, and R. J. Rudy

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The Dynamics of Nonlinear Atmospheric Acoustic-Gravity Waves Generated by Tsunamis Over Realistic Bathymetry, P. A. Inchin, C. J. Heale, J. B. Snively, and M. D. Zettergren

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Mesopause Airglow Disturbances Driven by Nonlinear Infrasonic Acoustic Waves Generated by Large Earthquakes, P. A. Inchin, J. B. Snively, J. Aguilar Guerrero, M. D. Zettergren, A. Williamson, and D. Melgar

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Modeling of Ionospheric Responses to Atmospheric Acoustic and Gravity Waves Driven by the 2015 Nepal M w 7.8 Gorkha Earthquake, P. A. Inchin, J. B. Snively, M. D. Zettergren, A. Komjathy, O. P. Verkhoglyadova, and S. Tulasi Ram

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The EXOTIME Project: Signals in the O − C Diagrams of the Rapidly Pulsating Subdwarfs DW Lyn, V1636 Ori, QQ Vir, and V541 Hya, F. Mackebrandt, Terry Oswalt, S. Schuh, R. Silvotti, S. -L. Kim, D. Kilkenny, E. M. Green, R. Lutz, T. Nagel, J. L. Provencal, Tomomi Otani, S. Benatti, L. Lanteri, A. Bonanno, A. Frasca, R. Janulis, M. Paparó, L. Molnár, R. Claudi, and R. H. Østensen

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Finite-Time State Estimation for an Inverted Pendulum under Input-Multiplicative Uncertainty, William MacKunis, Sergey V. Drakunov, Anu Kossery Jayaprakash, Krishna Bhavithavya Kidambi, and Mahmut Reyhanoglu

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Astro2020 APC White Paper. 2020 Vision: Towards a Sustainable OIR System, Sally Oey, Terry D. Oswalt, Tom Maccarone, Fred Walter, Charles Bailyn, Jay Gallagher, Todd Henry, Derek Buzasi, J. Allyn Smith, Rachael Beaton, Jim Webb, Brad Barlow, Misty Bentz, Leslie Hebb, Patrick Kelly, Jedidah Isler, Michael Meyer, John Salzer, and Simone Scaringi

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Nearly 30,000 Late-Type Main-Sequence Stars with Stellar Age from LAMOST DR5, Jiajun Zhang, Terry D. Oswalt, Jingkun Zhao, Xilong Liang, Xianhao Ye, and Gang Zhao

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Two Portions of Sagittarius Stream in the LAMOST Complete Spectroscopic Survey of Pointing Area at Southern Galactic Cap, J. K. Zhao, Terry D. Oswalt, X. H. Ye, H. Wu, M. Yang, X. X. Xue, Y. Q. Chen, J. J. Zhan, and G. Zhao

Submissions from 2019

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Bayesian Characterization of Main-Sequence Binaries in the Old Open Cluster NGC 188, Roger E. Cohen, Ted von Hippel, and Aaron M. Geller

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Multilayer Observations and Modeling of Thunderstorm-Generated Gravity Waves Over the Midwestern United States, C. J. Heale, J. B. Snively, A. N. Bhatt, L. Hoffmann, and C. C. Stephan

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Numerical Modeling of the Propagation of Infrasonic Acoustic Waves Through the Turbulent Field Generated by the Breaking of Mountain Gravity Waves, Michael P. Hickey, Jonathan Snively, C Bailly, and J. L. Garrison

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Preservation of Our Astronomical Heritage: State of the Profession White Paper for Astro2020, James Lattis, Wayne Osborn, Terry D. Oswalt, Jennifer Lynn Bartlett, Elizabeth Griffin, Thomas Hockey, Stephen McCluskey, Alexei A. Pevtsov, Sara Schechner, and Virginia Trimble

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Gravity Wave Ducting Observed in the Mesosphere Over Jicamarca, Peru, Gerald A. Lehmacher, Christopher J. Heale, Jonathan B. Snively, Erhan Kudeki, Pablo M. Reyes, and Kiwook Lee

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Vortex: A New Rocketexperiment to Studymesoscale Dynamics at the Turbopause, Gerald A. Lehmacher, Jonathan B. Snively, Aroh Barjatya, Miguel F. Larsen, Michael J. Taylor, Franz-Josef Lübken, and Jorge L. Chau

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Comparison Between Fluid Simulation with Test Particles and 1 Hybrid Simulation for the Kelvin-Helmholtz Instability, Xuanye Ma, Katariina Nykyri, Brandon L. Burkholder, Rachel C. Rice, Peter A. Delamere, and Bishwa Neupane

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Steve and the Picket Fence: Evidence of Feedback-Unstable Magnetosphere-Ionosphere Interaction, Evgeny Mishin and Anatoly Streltsov

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First MMS Observation of Energetic Particles Trapped in High-Latitude Magnetic Field Depressions, Katariina Nykyri, Christina Chu, Xuanye Ma, Stephen A. Fuselier, and Rachel Rice

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Book Review: Exoplanets : Hidden Worlds and the Quest for Extraterrestrial Life, T. D. Oswalt

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An Analysis of the Atmospheric Propagation of Underground-Explosion-Generated Infrasonic Waves Based on the Equations of Fluid Dynamics: Ground Recordings, Roberto Sabatini, Jonathan B. Snively, Michael P. Hickey, and J. L. Garrison

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Effects of the Hall Conductivity in Ionospheric Heating Experiments, B. Tulegenov and A. V. Streltsov

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Artificial Aurora Produced by HAARP, B. Tulegenov, A. V. Streltsov, E. Kendall, M. McCarrick, and I. Galkin

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Latitude and Longitude Dependence of Ionospheric Tec and Magnetic Perturbations From Infrasonic-Acoustic Waves Generated by Strong Seismic Events, M. D. Zettergren and J. B. Snively

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Stellar Chromospheric Activity and Age Relation from Open Clusters in the LAMOST Survey, Jiajun Zhang, Terry Oswalt, Jingkun Zhao, Xiangsong Fang, Gang Zhao, Xilong Liang, Xianhao Ye, and Jing Zhong

Submissions from 2018

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Error Analysis of Multi-Needle Langmuir Probe Measurement Technique, Aroh Barjatya and William Merritt

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Momentum Flux Spectra of a Mountain Wave Event Over New Zealand, Katrina Bossert, David C. Fritts, Christopher J. Heale, Stephen D. Eckermann, John M. C. Plane, Jonathan B. Snively, Bifford P. Williams, Iain M. Reid, Damian J. Murphy, Andrew J. Spargo, and Andrew D. MacKinnon

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Modulation of Low-Altitude Ionospheric Upflow by Linear and Nonlinear Atmospheric Gravity Waves, M. R. Burleigh, C. J. Heale, M. D. Zettergren, and J. B. Snively

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Three-Dimensional Hybrid Simulation of Viscous-Like Processes at Saturn's Magnetosphere Boundary, P. A. Delamere, B. Burkholder, and X. Ma

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Dust Production and Depletion in Evolved Planetary Systems, J. Farihi, Ted von Hippel, Rik van Lieshout, P.W. Cauley, Erik Dennihy, and Et al.

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Precise Ages of Field Stars from White Dwarf Companions, M. Fouesneau, H-W. Rix, T. von Hippel, D. W. Hogg, and H. Tian

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A Comparison of Small- And Medium-Scale Gravity Wave Interactions in the Linear and Nonlinear Limits, C. J. Heale and J. B. Snively

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Localization Effects on the Dissipation of Gravity Wave Packets in the Upper Mesophere and Lower Thermosphere, C. J. Heale, R. L. Walterscheid, and J. B. Snively

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Breaking the Habit: The Peculiar 2016 Eruption of the Unique Recurrent Nova M31N 2008-12a, M. Henze, T. D. Oswalt, M. J. Darnley, S. C. Williams, M. Kato, and et al.

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A Bayesian Analysis of the Ages of Four Open Clusters, Elizabeth Jeffery, Ted von Hippel, David A. van Dyk, David C. Stenning, Elliot Robinson, Nathan Sten, and William H. Jefferys

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On the Short-Term Variability of Turbulence and Temperature in the Winter Mesosphere, Gerald A. Lehmacher, Aroh Barjatya, Miguel F. Larsen, Richard L. Collins, and Boris Strelnikov

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Kelvin-Helmholtz Instability: Lessons Learned and Ways Forward, A. Masson and K. Nykyri

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Book Review: Life on Mars: What to Know Before We Go, T. D. Oswalt

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Book Review: Spectral Atlas for Amateur Astronomers: A Guide to the Spectra of Astronomical Objects and Terrestrial Light Sources, T. D. Oswalt

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Orbital Characteristics of the Subdwarf-B and F V Star Binary EC 20117-4014 (=V4640 Sgr), T. Otani, T. D. Oswalt, A. E. Lynas-Gray, D. Kilkenny, C. Koen, M. Amaral, and R. Jordan

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Unexpected Occurrence of Mesospheric Frontal Gravity Wave Events Over the South Pole (90 degrees S), P.-D. Pautet, M. J. Taylor, J. B. Snively, and C. Solorio

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Bayesian Hierarchical Modelling of Initial-Final Mass Relations Across Star Clusters, Shijing Si, David A. van Dyk, Ted von Hippel, Elliot Robinson, Elizabeth Jeffery, and David C. Stenning

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Bayesian Analysis of Two Stellar Populations in Galactic Globular Clusters I: Statistical and Computational Methods, David Stenning, Ted von Hippel, Rachel Wagner-Kaiser, Elliot Robinson, David van Dyk, Ata Sarajedini, and Nathan Stein

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On the Existence of Ionospheric Feedback Instability in the Earth’s Magnetosphere-Ionosphere System, Anatoly V. Streltsov and Evgeny V. Mishin

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Ultralow Frequency Electrodynamics of Magnetosphere-Ionosphere Interactions Near the Plasmapause During Substorms, Anatoly V. Streltsov and Evgeny V. Mishin

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On the Asymmetry Between Upward and Downward Field-Aligned Currents Interacting With the Ionosphere, A. V. Streltsov

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Observations of Reduced Turbulence and Wave Activity in the Arctic Middle Atmosphere Following the January 2015 Sudden Stratospheric Warming, Colin C. Triplett, Aroh Barjatya, Jintai Li, Richard L. Collins, Gerald A. Lehmacher, David C. Fritts, Boris Strelnikov, Franz-Josef Lübken, Brentha Thurairajah, V. Lynn Harvey, Donald L. Hampton, and Roger H. Varney

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Thermal Removal of Carbon Dioxide from the Atmosphere: Energy Requirements and Scaling Issues, Ted von Hippel

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Bayesian Analysis of Two Stellar Populations in Galactic Globular Clusters II: NGC 5024, NGC 5272, and NGC 6352, Rachel Wagner-Kaiser, Ted von Hippel, David Stenning, Elliot Robinson, Ata Sarajedini, David van Dyk, Nathan Stein, and William H. Jefferys

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Asymmetric Kelvin-Helmholtz Instability at Jupiter's Magnetopause Boundary: Implications for Corotation-Dominated Systems, B. Zhang, P. A. Delamere, X. Ma, B. Burkholder, M. Wiltberger, J. G. Lyon, V. G. Merkin, and K. A. Sorathia

Submissions from 2017

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Secondary Gravity Wave Generation Over New Zealand During the DEEPWAVE Campaign, Katrina Bossert, Christopher G. Kruse, Christopher J. Heale, David C. Fritts, Bifford P. Williams, Jonathan B. Snively, Pierre-Dominique Pautet, and Michael J. Taylor

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Local Time Asymmetry of Saturn's Magnetosheath Flows, B. Burkholder, P. A. Delamere, X. Ma, M. F. Thomsen, R. J. Wilson, and F. Bagenal

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Anisotropic Fluid Modeling of Ionospheric Upflow: Effects of Low‐Altitude Anisotropy and Thermospheric Winds, M. R. Burleigh and M. Zettergren

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Temperature Variations in the Dayside Magnetosheath and Their Dependence on Ion-Scale Magnetic Structures: THEMIS Statistics and Measurements by MMS, A. P. Dimmock, A. Osmane, T. I. Pulkkinen, K. Nykyri, and E. Kilpua

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Magnetospherically-Trapped Dust and a Possible Model for the Unusual Transits at WD1145+017, J. Farihi, Ted von Hippel, and J. E. Pringle

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Hubble Parameter Measurement Constraints on the Redshift of the Deceleration-Acceleration Transition, Dynamical Dark Energy, and Space Curvature, Muhammad O. Farooq, Foram R. Madiyar, Sara Crandall, and Bharat Ratra

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Hubble Parameter Measurement Constraints on the Redshift of the Deceleration-Acceleration Transition, Dynamical Dark Energy, and Space Curvature, Omer Farooq, Foram Ranjeet Madiyar, Sara Crandall, and Bharat Ratra

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First Performance Results of a New Field-Widened Spatial Heterodyne Spectrometer for Geocoronal Hα Research, D. D. Gardner, E. J. Mierkiewicz, F. L. Roesler, J. M. Harlander, K. P. Jaehnig, S. M. Nossal, and L. M. Haffner

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Constraining Balmer Alpha Fine Structure Excitation Measured in Geocoronal Hydrogen Observations, D. D. Gardner, E. J. Mierkiewicz, F. L. Roesler, S. M. Nossal, and L. M. Haffner

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Multi-Site Simultaneous Time-Resolved Photometry with a Low Cost Electro-Optics System, F. Gasdia, Aroh Barjatya, and Sergei Bilardi

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First Na Lidar Measurements of Turbulence Heat Flux, Thermal Diffusivity, and Energy Dissipation Rate in the Mesopause Region, Yafang Guo, Alan Z. Liu, and Chester S. Gardner

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Numerical Modeling of a Multiscale Gravity Wave Event and Its Airglow Signatures over Mount Cook, New Zealand, During the DEEPWAVE Campaign, C. J. Heale, K. Bossert, J. B. Snively, D. C. Fritts, P. -D. Pautet, and M. J. Taylor

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On the Dawn-Dusk Asymmetry of the Kelvin-Helmholtz Instability Between 2007 and 2013, Z. W. Henry, K. Nykyri, T. W. Moore, A. P. Dimmock, and X. Ma

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Ionospheric Gravity Waves Driven by Oceanic Gravity Waves in Resonance: A Modeling Study in Search of Their Spectra, Michael P. Hickey and Yonghui Yu

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Local Time Dependence of Turbulent Magnetic Fields in Saturn's Magnetodisc, V. Kaminker, P. A. Delamere, C. S. Ng, T. Dennis, A. Otto, and X. Ma

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The Remote Observatories of the Southeastern Association for Research in Astronomy (SARA), William C. Keel, Terry D. Oswalt, Peter Mack, Gary Henson, Todd Hillwig, and et al.

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The Ages of the Thin Disk, Thick Disk, and the Halo from Nearby White Dwarfs, Mukremin Kilic, Ted von Hippel, Jeffrey A. Munn, Hugh C. Harris, James W. Liebert, and et al.

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Stellar Stream Candidates in the Solar Neighborhood Found in the LAMOST DR3 and TGAS, X. L. Liang, Terry Oswalt, J. K. Zhao, Y. Q. Chen, and G. Zhao

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Stellar Stream Candidates in the Solar Neighborhood Found in the LAMOST DR3 and TGAS, X. L. Liang, J. K. Zhao, T. D. Oswalt, Y. Q. Chen, L. Zhang, and G. Zhao

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IMF Dependence of Energetic Oxygen and Hydrogen Ion Distributions in the Near-Earth Magnetosphere, H. Luo, E. A. Kronberg, K. Nykyri, K. J. Trattner, P. W. Daly, G. X. Chen, A. M. Du, and Y. S. Ge