Sebastijan Mrak

Supplementary material to "Electrodynamic Reconfiguration of the Polar Ionosphere During the 2021 Antarctic Solar Eclipse"

Shibaji Chakraborty, Sebastijan Mrak, Alex Timothy Chartier, Evan G. Thomas et autres

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Electrodynamic Reconfiguration of the Polar Ionosphere During the 2021 Antarctic Solar Eclipse

Shibaji Chakraborty, Sebastijan Mrak, Alex Timothy Chartier, Evan G. Thomas et autres

Abstract. The 4 December 2021 Antarctic total solar eclipse enhanced anti-sunward polar cap plasma flow, as directly and independently observed by the SuperDARN McMurdo (MCM) radar and the Jang Bogo VIPIR, modulated by eclipse obscuration. AMPERE field-aligned currents (FACs) over the same …

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The High‐Latitude Workbox for the Ionosphere (HAWK‐I): A New Toolkit for Real‐Time Specification of the Arctic Ionosphere

P. B. Dandenault, Clayton E. Cantrall, R. K. Schaefer, Sebastijan Mrak et autres

Abstract The high‐latitude ionosphere exhibits rapid spatial and temporal variability during geomagnetically active periods, creating persistent challenges for accurate nowcasts. The High‐latitude Workbox for the Ionosphere (HAWK‐I) is a real‐time ionosphere nowcast and specification system designed for operational deployment to address these …

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Impacts of Ionospheric Conductance During the December 2021 Solar Eclipse on the Coupled Magnetosphere‐Ionosphere‐Thermosphere System

Yu Hong, Yue Deng, Daniel T. Welling, A. J. Ridley et autres

Abstract Solar eclipses provide unique opportunities to investigate geospace dynamics driven by rapid, localized reductions in solar radiation. On December , 2021, a total solar eclipse occurred over West Antarctica during substorms. While eclipse effects on Earth's upper atmosphere are widely studied, …

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HAWK-I high-latitude TEC-only regridded output for the May 2024 geomagnetic storm

Patrick Dandenault, Clayton E. Cantrall, Robert Schaefer, Sebastijan Mrak et autres

This dataset contains reduced NetCDF output files from the HAWK-I / IDA4D high-latitude ionosphere data assimilation experiment for the May 2024 geomagnetic storm period. The files were derived from Regridded output products and subset to retain only longitude, latitude, and total electron …

HAWK-I high-latitude TEC-only regridded output for the May 2024 geomagnetic storm

Patrick Dandenault, Clayton E. Cantrall, Robert Schaefer, Sebastijan Mrak et autres

This dataset contains reduced NetCDF output files from the HAWK-I / IDA4D high-latitude ionosphere data assimilation experiment for the May 2024 geomagnetic storm period. The files were derived from Regridded output products and subset to retain only longitude, latitude, and total electron …

space-physics/dascasi: dascasi name, modernize

scivision, Samuel, Sebastijan Mrak

Digital All Sky Camera utilities, for U. Alaska Geophysical Institute cameras

Response of High-Latitude GNSS Scintillations to Ionospheric Gradients and Particle Precipitation During Storms and Substorms

Jay R. Johnson, Braeden Peterson, Noah D. Koliadko, Simon Wing et autres

Global Navigation Satellite System (GNSS) signals are highly susceptible to ionospheric scintillations, which can degrade positioning accuracy by several meters even under mild conditions and can cause total signal loss during periods of strong geomagnetic activity. High-latitude regions are particularly affected due …

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On the Use of High-frequency Surface Wave Oceanographic Research Radars as a Tool for Studying Traveling Ionospheric Disturbances

James P. Conroy, Val Hernley, Ethan Miller, Stephen Kaeppler et autres

In this paper, we build upon previous work (Kaeppler, S. R., Miller, E. S., Cole, D., and Updyke, T.: On the use of high-frequency surface wave oceanographic research radars as bistatic single-frequency oblique ionospheric sounders, Atmos. Meas. Tech., 15, 4531–4545, 2022) to …

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Spatio-Temporal Evolution of Ionospheric Irregularities and Their Impact on GPS Positioning: Insights From the May 2024 Solar Storm

Waqar Younas, Y. Nishimura, Weixuan Liao, Josh L. Semeter et autres

The May 10–11, 2024, geomagnetic superstorm offered a unique opportunity to investigate the multi-latitude impacts of storm-time ionospheric disturbances on Global Positioning System (GPS) performance. We combined ground-based GPS receiver data, positioning solutions, and Antarctic all-sky camera observations to analyze vertical total …

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High-Latitude GNSS Scintillation Responses to Storm and Substorm Forcing: Roles of Solar-Wind Driving, AL activity, and Seasonal Dependence

Jay Johnson, Braeden Peterson, Isaiah Scaffidi, Noah Koliadko et autres

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Thermospheric Gravity Waves and Ionospheric Disturbances Triggered by Mountain Waves Over the Western US in January 2017

Erich Becker, Sebastijan Mrak, Sharon L. Vadas

Abstract We analyze an episode of strong mountain wave (MW) activity over the western US from 9 to 12 January 2017 using the HIgh Altitude mechanistic General Circulation Model. We find that medium‐scale MWs were generated by strong eastward flow over the …

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