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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  • The Radiation Belt Electron Scattering by Magnetosonic Wave: Dependence on Key Parameters 

    Lei, Mingda; Xie, Lun; Li, Jinxing; Pu, Zuyin; Fu, Suiyan; Ni, Binbin; Hua, Man; Chen, Lunjin; Li, Wen (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 

    Walach, M. -T; Milan, S. E.; Yeoman, T. K.; Hubert, B. A.; Hairston, Marc R. (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 

    Tulasi Ram, S.; Yokoyama, T.; Otsuka, Y.; Shiokawa, K.; Sripathi, S.; Veenadhari, B.; Heelis, Roderick A.; Ajith, K. K.; Gowtam, V. S.; Gurubaran, S.; Supnithi, P.; Le Huy, M. (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 

    Huang, Cheryl Yu-Ying; Huang, Yanshi; Su, Yi-Jiun; Sutton, Eric K.; Hairston, Marc Rotan; Coley, William Robin (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 

    Smith, J. M.; Rodrigues, Fabiano S.; de Paula, E. R. (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 

    Kelley, M. C.; Rodrigues, Fabiano S.; Pfaff, R. F.; Klenzing, J. (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 ...
  • Identifying Equatorial Ionospheric Irregularities using In Situ Ion Drifts 

    Stoneback, Russell A.; Heelis, Roderick A. (Copernicus Gesellschaft Mbh, 2014-04-15)
    Previous climatological investigations of ionospheric irregularity occurrence in the equatorial ionosphere have utilized in situ measurements of plasma density to identify the presence of an irregularity. Here we use the ...
  • Storm-Time Meridional Flows: A Comparison of CINDI Observations and Model Results 

    Hairston, Marc R.; Maruyama, N.; Coley, William R.; Stoneback, Russell A. (Copernicus Gmbh, 2014-06-17)
    During a large geomagnetic storm, the electric field from the polar ionosphere can expand far enough to affect the mid-latitude and equatorial electric fields. These changes in the equatorial zonal electric field, called ...
  • The Longitudinal Variability of Equatorial Electrojet and Vertical Drift Velocity in the African and American Sectors 

    Yizengaw, E.; Moldwin, M. B.; Zesta, E.; Biouele, C. M.; Damtie, B.; Mebrahtu, A.; Rabiu, B.; Valladares, C. F.; Stoneback, Russell A. (Copernicus Gesellschaft Mbh, 2014-03-13)
    While the formation of equatorial electrojet (EEJ) and its temporal variation is believed to be fairly well understood, the longitudinal variability at all local times is still unknown. This paper presents a case and ...
  • Modeling a Sensor to Improve its Efficacy 

    Malakar, Nabin K.; Gladkov, Daniil; Knuth, Kevin H. (Hindawi Publishing Corporation, 2013-05-20)
    Robots rely on sensors to provide them with information about their surroundings. However, high-quality sensors can be extremely expensive and cost-prohibitive. Thus many robotic systems must make due with lower-quality ...