William B. Hanson Center for Space Sciences
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The William B. Hanson Center for Space Sciences conducts research in space plasma physics. Its goal is to "advance the understanding of the evolution of Solar system bodies and their interaction with the Sun." Find out more about the Center on its website.
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Temporal Characteristic of the Mesoscale Plasma Flow Perturbations in the High-Latitude Ionosphere
(Amer Geophysical Union, 2019-01-03)Spatial and temporal characteristics of flow perturbations in the high-latitude ionosphere are important considerations for energy deposition from the magnetosphere. In this study, we examine the temporal characteristics ... -
Event Studies of O⁺ Density Variability Within Quiet-Time Plasma Sheet
(Blackwell Publishing Ltd, 2019-06-18)To understand the variations of the O⁺ ions in the quiet-time plasma sheet between the regions of cold-dense plasma sheet (CDPS) and hot plasma sheet (HPS), we conduct three event studies. These studies investigate the O⁺ ... -
Modeling Energetic Electron Nonlinear Wave-Particle Interactions with Electromagnetic Ion Cyclotron Waves
(Blackwell Publishing Ltd, 2019-04-15)Electromagnetic ion cyclotron (EMIC) waves in duskside plasmasphere and plasmaspheric plume scatter megaelectron volt electrons into the loss cone and are considered a major loss mechanism for the outer radiation belt. ... -
Estimating the Daily Pollen Concentration in the Atmosphere Using Machine Learning and NEXRAD Weather Radar Data
(Springer International Publishing, 2019-06-07)Millions of people have an allergic reaction to pollen. The impact of pollen allergies is on the rise due to increased pollen levels caused by global warming and the spread of highly invasive weeds. The production, release, ... -
Applying Deep Neural Networks and Ensemble Machine Learning Methods To Forecast Airborne Ambrosia Pollen
(MDPI AG, 2019-06-04)Allergies to airborne pollen are a significant issue affecting millions of Americans. Consequently, accurately predicting the daily concentration of airborne pollen is of significant public benefit in providing timely ... -
Seasonal and Temporal Variations of Field-Aligned Currents and Ground Magnetic Deflections During Substorms
Field-aligned currents (FACs), also known as Birkeland currents, are the agents by which energy and momentum are transferred to the ionosphere from the magnetosphere and solar wind. This coupling is enhanced at substorm ... -
Plasma Dynamics Associated with Equatorial Ionospheric Irregularities
The Communication/Navigation Outage Forecasting System satellite was operational from 2008, a period of deep solar minimum, to 2015, a period of moderate solar conditions. The behavior of the vertical plasma drift and the ... -
The Ion/Electron Temperature Characteristics of Polar Cap Classical and Hot Patches and their Influence on Ion Upflow
The term of “polar cap hot patch” is a newly identified high-density plasma irregularity at high latitudes, which is associated with high electron temperature and particle precipitation, while a classical polar cap patch ... -
Quantifying Extremely Rapid Flux Enhancements of Radiation Belt Relativistic Electrons Associated with Radial Diffusion
Previous studies have revealed a typical picture that seed electrons are transported inward under the drive of radial diffusion and then accelerated via chorus to relativistic energies. Here we show a potentially different ... -
Study of the Equatorial and Low-Latitude Electrodynamic and Ionospheric Disturbances during the 22–23 June 2015 Geomagnetic Storm Using Ground-Based and Spaceborne Techniques
We use a set of ground-based instruments (Global Positioning System receivers, ionosondes, magnetometers) along with data of multiple satellite missions (Swarm, C/NOFS, DMSP, GUVI) to analyze the equatorial and low-latitude ... -
An Auroral Boundary-Oriented Model of Subauroral Polarization Streams (SAPS)
An empirical model of subauroral polarization stream (SAPS) electric fields has been developed using measurements of ion drifts and particle precipitation made by the Defense Meteorological Satellite Program from 1987 to ... -
Coincident Observations by the Kharkiv IS Radar and Ionosonde, DMSP and Arase (ERG) Satellites, and FLIP Model Simulations: Implications for the NRLMSISE-00 Hydrogen Density, Plasmasphere, and Ionosphere
This paper reports the results of ionosphere and plasmasphere observations with the Kharkiv incoherent scatter radar and ionosonde, Defense Meteorological Satellite Program, and Arase (ERG) satellites and simulations with ... -
Effects of Electric Field and Neutral Wind on the Asymmetry of Equatorial Ionization Anomaly
The zonal electric field and the meridional neutral wind are the principal drivers that define the geometry and characteristics of the equatorial ionization anomaly (EIA). Here we present the response of the EIA to the ... -
The Plasma Environment Associated with Equatorial Ionospheric Irregularities
We examine the density structure of equatorial depletions referred to here as equatorial plasma bubbles (EPBs). Data recorded by the Ion Velocity Meter as part of the Coupled Ion Neutral Dynamics Investigation (CINDI) ... -
The Radiation Belt Electron Scattering by Magnetosonic Wave: Dependence on Key Parameters
(Amer Geophysical Union, 2018-10-22)Magnetosonic (MS) waves have been found capable of creating radiation belt electron butterfly distributions in the inner magnetosphere. To investigate the physical nature of the interactions between radiation belt electrons ... -
Testing Nowcasts of the Ionospheric Convection from the Expanding and Contracting Polar Cap Model
(Amer Geophysical Union, 2017-04-20)The expanding/contracting polar cap (ECPC) model, or the time-dependent Dungey cycle, provides a theoretical framework for understanding solar wind-magnetosphere-ionosphere coupling. The ECPC describes the relationship ... -
Duskside Enhancement of Equatorial Zonal Electric Field Response to Convection Electric Fields During the St. Patrick's Day Storm on 17 March 2015
(Blackwell Publishing Ltd, 2016-01-11)The equatorial zonal electric field responses to prompt penetration of eastward convection electric fields (PPEF) were compared at closely spaced longitudinal intervals at dusk to premidnight sectors during the intense ... -
Ionosphere-Thermosphere (IT) Response to Solar Wind Forcing During Magnetic Storms
(EDP Sciences S A, 2016-01-25)During magnetic storms, there is a strong response in the ionosphere and thermosphere which occurs at polar latitudes. Energy input in the form of Poynting flux and energetic particle precipitation, and energy output in ... -
Radar and Satellite Investigations of Equatorial Evening Vertical Drifts and Spread F
(Copernicus Gesellschaft Mbh, 2015-11-11)We analyzed pre-midnight equatorial F region observations made by the 30 MHz coherent backscatter radar of Sao Luis, Brazil between August 2010 and February 2012. These measurements were processed, and used to create monthly ... -
Observations of the Generation of Eastward Equatorial Electric Fields near Dawn
(Copernicus Gesellschaft Mbh, 2014-09-19)We report and discuss interesting observations of the variability of electric fields and ionospheric densities near sunrise in the equatorial ionosphere made by instruments onboard the Communications/Navigation Outage ...
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