Positions

Research Areas research areas

Overview

  • Our technology-driven society is dependent upon satellite technology for communication, navigation, and national security, as well as upon a reliable power grid for everyday needs such as food storage. These infrastructure systems are vulnerable to geomagnetic activity, when charged particles in the space surrounding Earth are energized and transported due to energy input from the Sun. My research centers on studying these charged particles during enhanced geomagnetically active events to improve our understanding of and eventually be able to forecast the characteristics of space during them. Such improved space weather forecasts would provide a reliable warning system to protect satellite and power grid infrastructure.

    My research includes three areas: magnetospheric physics, instrument development, and laboratory plasma physics. In magnetospheric physics, I analyze satellite-based data to understand the dynamics of the magnetosphere during geomagnetic storms. These data are often incorporated with computer models to improve understanding of the underlying physics. I am working to develop the next generation of plasma spectrometers to measure charged particles in space, particularly on small platforms such as CubeSats. The spectrometer is also being developed as a diagnostic for fusion energy producing plasma research. I am also involved in laboratory based plasma physics research, particularly with laser-based diagnostics. These studies help us to understand space-relevant phenomena.
  • Publications

    Academic Article

    Year Title
    2018 Micro-spectrometer for fusion plasma boundary measurements.Review of Scientific Instruments.  89:10J116. 2018
    2018 Laser induced fluorescence of Ar-I metastables in the presence of a magnetic fieldPlasma Sources Science and Technology.  27:065007-065007. 2018
    2017 The Effect of Storm Driver and Intensity on Magnetospheric Ion TemperaturesJournal of Geophysical Research.  122:9414-9426. 2017
    2017 Storm time equatorial magnetospheric ion temperature derived from TWINS ENA fluxJournal of Geophysical Research.  122:3985-3996. 2017
    2016 A micro-scale plasma spectrometer for space and plasma edge applications (invited).Review of Scientific Instruments.  87:11D302. 2016
    2016 Geomagnetic disturbance intensity dependence on the universal timing of the storm peakJournal of Geophysical Research.  121:7561-7571. 2016
    2016 Key elements of a low voltage, ultracompact plasma spectrometerJournal of Geophysical Research.  121:1452-1465. 2016
    2015 Effects of modeled ionospheric conductance and electron loss on self-consistent ring current simulations during the 5-7 April 2010 stormJournal of Geophysical Research.  120:5355-5376. 2015
    2015 Statistical storm time examination of MLT-dependent plasmapause location derived from IMAGE EUVJournal of Geophysical Research.  120:5545-5559. 2015
    2015 Database of ion temperature maps during geomagnetic storms.Earth and Space Science.  2:39-46. 2015
    2015 The hot hELicon eXperiment (HELIX) and the large experiment on instabilities and anisotropy (LEIA)Journal of Plasma Physics.  81. 2015
    2014 Regions of ion energization observed during the Galaxy-15 substorm with TWINSJournal of Geophysical Research.  119:8274-8287. 2014
    2014 Superposed epoch analyses of ion temperatures during CME- and CIR/HSS-driven stormsJournal of Atmospheric and Solar-Terrestrial Physics Journal of Atmospheric and Terrestrial Physics.  115:67-78. 2014
    2014 First results using TWINS-derived ion temperature boundary conditions in CRCMJournal of Geophysical Research.  119:3345-3361. 2014
    2014 Dawn-dusk asymmetries in the coupled solar wind-magnetosphere-ionosphere system: a reviewAnnales Geophysicae.  32:705-737. 2014
    2013 Spontaneous ion beam formation in the laboratory, space, and simulationPhysics of Plasmas.  20:072118-072118. 2013
    2012 Inner magnetosphere convection and magnetotail structure of hot ions imaged by ENA during a HSS-driven stormJournal of Geophysical Research.  117:n/a-n/a. 2012
    2011 Remote observations of ion temperatures in the quiet time magnetosphereGeophysical Research Letters.  38:n/a-n/a. 2011
    2008 Method to estimate the electron temperature and neutral density in a plasma from spectroscopic measurements using argon atom and ion collisional-radiative models.Review of Scientific Instruments.  79:10E324. 2008
    2008 Remote measurements of ion temperatures in the terrestrial magnetotailJournal of Geophysical Research.  113:n/a-n/a. 2008
    2008 Mini-conference on helicon plasma sourcesPhysics of Plasmas.  15:058301-058301. 2008
    2007 Neutral density profiles in argon helicon plasmasPlasma Sources Science and Technology.  16:742-749. 2007
    2007 Flow, flow shear, and related profiles in helicon plasmasPhysics of Plasmas.  14:043505-043505. 2007
    2005 The ion velocity distribution function in a current-free double layerPhysics of Plasmas.  12:093502-093502. 2005
    2005 Observations of ion-beam formation in a current-free double layer.Physical Review Letters.  95:025004. 2005
    2004 High-speed imaging of edge turbulence in NSTXNuclear Fusion.  44:134-153. 2004
    2002 Slow wave ion heating in the HELIX helicon sourcePlasma Sources Science and Technology.  11:413-425. 2002
    2002 Evidence for thermal anisotropy effects on shear modified ion acoustic instabilitiesPhysics of Plasmas.  9:4399-4401. 2002
    2002 Remote ion temperature measurements of Earth's magnetosphere: Medium energy neutral atom (MENA) imagesGeophysical Research Letters.  29:80-1-80-4. 2002
    2002 RF absorption and ion heating in helicon sources.Physical Review Letters.  88:195002. 2002

    Conference Proceeding

    Year Title
    2010 Time-resolved measurements of double layer evolution in expanding plasmaPhysics of Plasmas. 055701-055701. 2010
    2006 Neutral argon density profile determination by comparison of spectroscopic measurements and a collisional-radiative model (invited)Review of Scientific Instruments. 10F304-10F304. 2006
    2004 Laser-induced fluorescence measurements of three plasma species with a tunable diode laserReview of Scientific Instruments. 4091-4093. 2004
    2003 Ion dynamics in helicon sourcesPhysics of Plasmas. 2127-2135. 2003

    Principal Investigator On

    Teaching Activities

  • Optics Taught course 2018
  • Senior Design Project Taught course 2018
  • Education And Training

  • B.S. Mathematics, Davidson College
  • M.S. Physics, West Virginia University
  • Ph.D. Plasma Physics, West Virginia University
  • Full Name

  • Amy Keesee