Nathan Case
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View article: BioSecure Digital Twin: Manufacturing Innovation and Cybersecurity Resilience
BioSecure Digital Twin: Manufacturing Innovation and Cybersecurity Resilience Open
U.S. national security, prosperity, economy, and well-being require secure, flexible, and resilient Biopharmaceutical Manufacturing. The COVID-19 pandemic reaffirmed that the biomedical production value-chain is vulnerable to disruption an…
View article: The Influence of Localized Dynamics on Dusk‐Dawn Convection in the Earth’s Magnetotail
The Influence of Localized Dynamics on Dusk‐Dawn Convection in the Earth’s Magnetotail Open
Previous work has shown that earthward convective flow bursts in the magnetotail have a dusk‐dawn ( ) component that is controlled by the historical state of the Interplanetary Magnetic Field (IMF) B y component. Here, we analyze 27 years …
View article: Dynamics of variable dusk–dawn flow associated with magnetotail current sheet flapping
Dynamics of variable dusk–dawn flow associated with magnetotail current sheet flapping Open
We present Cluster spacecraft observations from 12 October 2006 of convective plasma flows in the Earth's magnetotail. Earthward flow bursts with a dawnward v⊥y component, observed by Cluster 1 (C1), are inconsistent with the duskward flow…
View article: Reply on AC2
Reply on AC2 Open
Abstract. We present Cluster spacecraft observations from 12 October 2006 of convective plasma flows in the Earth's magnetotail. Earthward flow bursts with a dawnward v⊥y component, observed by Cluster 1 (C1), are inconsistent with the dus…
View article: Dynamics of Variable Dusk-Dawn Flow Associated with Magnetotail Current Sheet Flapping
Dynamics of Variable Dusk-Dawn Flow Associated with Magnetotail Current Sheet Flapping Open
Previous observations have provided a clear indication that the dusk-dawn (v⊥y) sense of both slow (< 200 km s−1) and fast (> 200 km s−1) convective magnetotail flows is strongly governed by the Interplanetary Magnetic Field (IMF) By condi…
View article: Inner Magnetospheric Response to the Interplanetary Magnetic Field <i>B</i><sub><i>y</i></sub> Component: Van Allen Probes and Arase Observations
Inner Magnetospheric Response to the Interplanetary Magnetic Field <i>B</i><sub><i>y</i></sub> Component: Van Allen Probes and Arase Observations Open
We utilize 17 years of combined Van Allen Probes and Arase data to statistically analyze the response of the inner magnetosphere to the orientation of the interplanetary magnetic field (IMF) B y component. Past studies have demonstrated th…
View article: Convection in the Magnetosphere‐Ionosphere System: A Multimission Survey of Its Response to IMF <i>B</i><sub><i>y</i></sub> Reversals
Convection in the Magnetosphere‐Ionosphere System: A Multimission Survey of Its Response to IMF <i>B</i><sub><i>y</i></sub> Reversals Open
Past studies have demonstrated that the interplanetary magnetic field (IMF) B y component introduces asymmetries in the magnetosphere‐ionosphere (M‐I) system, though the exact timings involved are still unclear with two distinct mechanisms…
View article: Do Statistical Models Capture the Dynamics of the Magnetopause During Sudden Magnetospheric Compressions?
Do Statistical Models Capture the Dynamics of the Magnetopause During Sudden Magnetospheric Compressions? Open
Under periods of strong solar wind driving, the magnetopause can become compressed, playing a significant role in draining electrons from the outer radiation belt. Also termed “magnetopause shadowing,” this loss process has traditionally b…
View article: Do Statistical models capture magnetopause dynamics during sudden magnetospheric compressions?
Do Statistical models capture magnetopause dynamics during sudden magnetospheric compressions? Open
<p>Under steady-state conditions the magnetopause location is described as a pressure balance between internal magnetic pressures and the external dynamic pressure of the solar wind. The question is, does this approximation hold duri…
View article: National Astronomy Meeting 2019 Abstract Book
National Astronomy Meeting 2019 Abstract Book Open
The National Astronomy Meeting 2019 Abstract Book. Abstracts accepted and presented, including both oral and poster presentations, at the Royal Astronomical Society's NAM2019 conference, held at Lancaster University between 30 June and 4 J…
View article: National Astronomy Meeting 2019 Abstract Book
National Astronomy Meeting 2019 Abstract Book Open
The National Astronomy Meeting 2019 Abstract Book. Abstracts accepted and presented, including both oral and poster presentations, at the Royal Astronomical Society's NAM2019 conference, held at Lancaster University between 30 June and 4 J…
View article: Vertical Current Density Structure of Saturn's Equatorial Current Sheet
Vertical Current Density Structure of Saturn's Equatorial Current Sheet Open
Routine spacecraft encounters with the Saturn current sheet due to the passage of aperiodic waves provide the opportunity to analyze the current sheet structure. The current density is expected to peak where the field strength reaches a mi…
View article: Aurorasaurus Database of Real‐Time, Crowd‐Sourced Aurora Data for Space Weather Research
Aurorasaurus Database of Real‐Time, Crowd‐Sourced Aurora Data for Space Weather Research Open
This technical report documents the details of Aurorasaurus citizen science data for the period spanning 2015 and 2016 as well as its routine data filtering protocols. Aurorasaurus citizen science data is a collection of auroral sightings …
View article: Response of Earth's Neutral Sheet to Reversals in the IMF <i>B</i><sub><i>y</i></sub> Component
Response of Earth's Neutral Sheet to Reversals in the IMF <i>B</i><sub><i>y</i></sub> Component Open
The B y component of the interplanetary magnetic field (IMF) plays an integral part in the coupling of the solar wind‐magnetosphere‐ionosphere system. In this study, we use a suite of magnetospheric spacecraft, with data spanning nearly 25…
View article: Aurorasaurus Real-Time Citizen Science Aurora Data
Aurorasaurus Real-Time Citizen Science Aurora Data Open
Aurorasaurus citizen science data is a collection of auroral sightings submitted to the project via its website (aurorasaurus.org) or apps and mined from social media. It is a robust data set and particularly abundant during strong geomagn…
View article: Aurorasaurus Real-Time Citizen Science Aurora Data
Aurorasaurus Real-Time Citizen Science Aurora Data Open
Aurorasaurus citizen science data is a collection of auroral sightings submitted to the project via its website (aurorasaurus.org) or apps and mined from social media. It is a robust data set and particularly abundant during strong geomagn…
View article: New science in plain sight: Citizen scientists lead to the discovery of optical structure in the upper atmosphere
New science in plain sight: Citizen scientists lead to the discovery of optical structure in the upper atmosphere Open
Citizen scientists, along with satellite and ground-based sensors, have revealed a new arc boundary at subauroral latitudes.
View article: Twisting of Earth's Neutral Sheet and its Response to Changes in the IMF By Component
Twisting of Earth's Neutral Sheet and its Response to Changes in the IMF By Component Open
We have collated over 25 years of magnetic field, electric field, and velocity data from the Geotail, Cluster, Double Star, and Themis spacecraft missions to elucidate large-scale patterns in the terrestrial magnetotail, particularly those…
View article: AuroraWatch UK: An Automated Aurora Alert System
AuroraWatch UK: An Automated Aurora Alert System Open
The AuroraWatch UK aurora alert service uses a network of magnetometers from across the United Kingdom to measure the disturbance in the Earth's magnetic field caused by the aurora borealis (northern lights). The service has been measuring…
View article: An analysis of magnetic reconnection events and their associated auroral enhancements
An analysis of magnetic reconnection events and their associated auroral enhancements Open
An analysis of simultaneous reconnection events in the near‐Earth magnetotail and enhancements in the aurora is undertaken. Exploiting magnetospheric data from the Geotail, Cluster, and Double Star missions, along with auroral images from …
View article: Determining the Accuracy of Crowdsourced Tweet Verification for Auroral Research
Determining the Accuracy of Crowdsourced Tweet Verification for Auroral Research Open
The Aurorasaurus project harnesses volunteer crowdsourcing to identify sightings of an aurora (the “northern/southern lights”) posted by citizen scientists on Twitter. Previous studies have demonstrated that aurora sightings can be mined f…
View article: A real‐time hybrid aurora alert system: Combining citizen science reports with an auroral oval model
A real‐time hybrid aurora alert system: Combining citizen science reports with an auroral oval model Open
Accurately predicting when, and from where, an aurora will be visible is particularly difficult, yet it is a service much desired by the general public. Several aurora alert services exist that attempt to provide such predictions but are, …
View article: Using citizen science reports to define the equatorial extent of auroral visibility
Using citizen science reports to define the equatorial extent of auroral visibility Open
An aurora may often be viewed hundreds of kilometers equatorward of the auroral oval owing to its altitude. As such, the NOAA Space Weather Prediction Center (SWPC) Aurora Forecast product provides a “view line” to demonstrate the equatori…
View article: A Comparison of Modeled Auroral Boundaries with Observations from Citizen Scientists
A Comparison of Modeled Auroral Boundaries with Observations from Citizen Scientists Open
Over the past year, the citizen science project Aurorasaurus has collected new, globally-distributed, ground-based observations of the aurora and has integrated them with space-based estimates of auroral activity. A case study of these obs…
View article: Aurorasaurus: A citizen science platform for viewing and reporting the aurora
Aurorasaurus: A citizen science platform for viewing and reporting the aurora Open
A new, citizen science‐based, aurora observing and reporting platform has been developed with the primary aim of collecting auroral observations made by the general public to further improve the modeling of the aurora. In addition, the rea…