A5045892842- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Solar and Space Plasma Dynamics
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Oceanographic and Atmospheric Processes
- Meteorological Phenomena and Simulations
- Atmospheric Ozone and Climate
- Aerospace Engineering and Energy Systems
- Astro and Planetary Science
- Spacecraft Design and Technology
- Tropical and Extratropical Cyclones Research
- Traffic Prediction and Management Techniques
- Geochemistry and Elemental Analysis
- Spacecraft Dynamics and Control
- Gas Dynamics and Kinetic Theory
- Icing and De-icing Technologies
- Flood Risk Assessment and Management
- Coastal and Marine Dynamics
University of Michigan
2020-2025
MathWorks (United States)
2023
American University
2022
Goddard Space Flight Center
2022
Michigan United
2021
Indian Institute of Technology Bombay
2014
The magnetospheric physics research community uses a broad array of quantitative data-model comparison methods (metrics) when conducting their investigations. It is often the case, though, that any particular study will only use one or two metrics, with most common being Pearson correlation coefficient and root mean square error (RMSE). Because metrics are designed to test specific aspect relationship, limiting reduces physical insights can be gleaned from analysis, restricting possible...
Ionospheric conductance is a crucial factor in regulating the closure of magnetospheric field-aligned currents through ionosphere as Hall and Pedersen currents. Despite its importance predictive investigations magnetosphere - coupling, estimation ionospheric auroral region precarious most global first-principles based models. This impreciseness estimating impedes both our understanding capabilities magnetosphere-ionosphere system during extreme space weather events. In this article, we...
In the recent geological past, Earth’s magnetic field reduced to ~10% of modern values and poles shifted away from geographic poles, causing Laschamps geomagnetic excursion, about 41 millennia ago. The excursion lasted ~2000 years, with dipole strength reduction tilting spanning 300 years. During this period, field’s multipolarity resembled outer planets, rapid magnetospheric changes. To our knowledge, study presents first space plasma analysis linking field, system, upper atmosphere in...
The accurate determination of auroral precipitation in global models has remained a daunting and rather inexplicable obstacle. Understanding the calculation balance multiple sources that constitute aurora, their eventual conversion into ionospheric electrical conductance, is critical for improved prediction space weather events. In this study, we present semi-physical modeling approach characterizes contributions by four types precipitation-monoenergetic, broadband, electron, ion diffuse-to...
The performance of three global magnetohydrodynamic (MHD) models in estimating the Earth's magnetopause location and ionospheric cross polar cap potential (CPCP) have been presented. Using Community Coordinated Modeling Center's Run-on-Request system extensive database on results various magnetospheric scenarios simulated for a variety solar weather patterns, aforementioned model predictions compared with standoff distance estimations obtained from six empirical models, Assimilative Mapping...
Abstract One of the prominent effects space weather is formation rapid geomagnetic field variations on Earth's surface driven by magnetosphere‐ionosphere system. These disturbances (GMDs) cause geomagnetically induced currents to run through ground conducting systems. In particular, localized GMDs (LGMDs) can be high amplitude and have an effect scale sizes less than 100 km, making them hazardous power grids difficult predict. this study, we examine ability Space Weather Modeling Framework...
Abstract We present the first high resolution global MHD with coupled inner magnetosphere simulation results of an observed theta aurora event. use Space Weather Modeling Framework in Geospace configuration, which produces accurate field aligned current closure ionosphere that is integral to formation. At location aurora, a narrow channel Joule heating along both open and closed lines, between pair oppositely directed field‐aligned sheets ionosphere. demonstrate this pattern we identify as...
In this study, a detailed metric survey on the “Galaxy 15” (April 2010) space weather event is conducted to validate MAGNetosphere–Ionosphere–Thermosphere (MAGNIT), semi-physical auroral ionospheric conductance model characterizing four precipitation sources, against AMPERE measurements via field-aligned current (FAC) characteristics. As part of comparative performance three ionosphere electrodynamic specifications involving models, MAGNIT, Ridley Legacy Model (RLM) (empirical), and...
Acquiring quantitative metrics-based analysis regarding the performance of most first-principle space physics modeling approaches is key in understanding solar and weather. As established by successive Geospace Environment Modeling Challenges, quantification help set a precedent science behind various phenomena observed naturally addition to elucidating merits demerits weather prediction method. In this study, three magnetohydrodynamic models (SWMF/BATS-R-US, LFM OpenGGCM) estimating Earth's...
Earth and Space Science Open Archive Presented WorkOpen AccessYou are viewing the latest version by default [v1]Forecasting of Localized Geomagnetic Disturbances in Global Models: Physics NumericsAuthorsElizabethVandegriffiDDanielWellingAgnitMukhopadhyayiDAndrewDimmockStevenMorleyiDSee all authors Elizabeth VandegriffiDCorresponding Author• Submitting AuthorUniversity Texas at ArlingtoniDhttps://orcid.org/0000-0001-8851-0301view email addressThe was not providedcopy addressDaniel...
Earth and Space Science Open Archive This work has been accepted for publication in Weather. Version of RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v2]Conductance Model Extreme Events : Impact Auroral Conductance on Weather ForecastsAuthorsAgnitMukhopadhyayiDDaniel TWellingMichael W.LiemohniDAaron J.RidleyiDShibajiChakrabortyiDBrian...
Earth and Space Science Open Archive PosterOpen AccessYou are viewing the latest version by default [v1]Global Driving of Auroral Conductance - Balance Sources & Numerical ConsiderationsAuthorsAgnitMukhopadhyayiDDanielWellingMeghanBurleighMichaelLiemohniDAaronRidleyiDShashaZouiDBrianAndersoniDElizabethVandegriffHyunjuConnoriDJesperGjerloevSee all authors Agnit MukhopadhyayiDCorresponding Author• Submitting AuthorUniversity MichiganiDhttps://orcid.org/0000-0003-4666-944Xview email addressThe...
Ionospheric conductance is a crucial factor in regulating the closure of magnetospheric field-aligned currents through ionosphere as Hall and Pedersen currents. Despite its importance predictive investigations magnetosphere - coupling, estimation ionospheric auroral region precarious most global first-principles based models. This impreciseness estimating impedes both our understanding capabilities magnetosphere-ionosphere system during extreme space weather events. In this article, we...
We present simulation results of a transpolar auroral arc event that show the formation occurs on both open and closed field lines is sourced from dayside nightside magnetospheric reconnection. The precipitation sources magnetically connect across polar cap in flow channel to create structure. simulate 15 May 2005 observed by IMAGE satellite with University Michigan Space Weather Modeling Framework (SWMF) Geospace configuration. compare observations produced ionospheric Joule heating...
Heliophysics is the field that "studies nature of Sun, and how it influences very space - and, in turn, atmospheres planetary bodies technology exists there." However, NASA's Division tends to limit study magnetospheres only those Earth. This leaves exploration understanding plasma physics at other worlds purview Planetary Science Astrophysics Divisions. detrimental general since, although some cross-divisional funding opportunities do exist, vital elements can be best addressed by extending...
Estimation of the ionospheric conductance is a crucial step in coupling magnetosphere & ionosphere (MI). Since high-latitude closes magnetospheric currents, this region pivotal to examine predict MI dynamics, especially during extreme events. In spite its importance, only recently have impacts key contributors affecting auroral (e.g., particle distribution, ring current, anomalous heating, etc.) been explored using global models. Addressing these uncertainties require new capabilities -...
Earth and Space Science Open Archive This is a preprint has not been peer reviewed. ESSOAr venue for early communication or feedback before review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]Global Magnetohydrodynamic Simulations: Performance Quantification of Magnetopause Distances Convection Potential PredictionAuthorsAgnitMukhopadhyayiDXianzheJiaDanielWellingMichaelLiemohniDSee all authors Agnit...