Publications

Simon Shepherd

Cousins, E. D. P. and S. G. Shepherd (2012), Statistical maps of small-scale electric field variability in the high-latitude ionosphere, J. Geophys. Res., 117, A12304, doi:10.1029/2012JA017929.
Cousins, E. D. P. and S. G. Shepherd (2012), Statistical characteristics of small-scale spatial and temporal electric field variability in the high-latitude ionosphere, J. Geophys. Res., 117, A03317, doi:10.1029/2011JA017383.
Clausen, L. B. N., J. B. H. Baker, J. M. Ruohoniemi, R. A. Greenwald, E. G. Thomas, S. G. Shepherd, E. R. Talaat, W. A. Bristow, Y. Zheng, A. J. Coster, and S. Sazykin (2012), Large-scale observations of a subauroral polarization stream by midlatitude SuperDARN radars: Instantaneous longitudinal velocity variations, J. Geophys. Res., 117, A05306, doi:10.1029/2011JA017232.
Cousins, E. D. P., and S. G. Shepherd (2010), A dynamical model of high-latitude convection derived from SuperDARN plasma drift measurements, J. Geophys. Res., 115, A12329, doi:10.1029/2010JA016017.
Pettigrew, E. D., S. G. Shepherd, and J. M. Ruohoniemi (2010), Climatological patterns of high-latitude convection in the Northern and Southern hemispheres: Dipole tilt dependencies and interhemispheric comparisons, J. Geophys. Res., 115, A07305, doi:10.1029/2009JA014956.
Shepherd, S. G., and J. P. G. Shepherd (2009), Toroidal magnetic spacecraft shield used to deflect energetic charged particles, JOURNAL OF SPACECRAFT AND ROCKETS, VOL. 46, doi:10.2514/1.37727.
Shepherd, S. G. and B. T. Kress (2007), Störmer theory applied to magnetic spacecraft shielding, Space Weather, 5, S04001, doi:10.1029/2006SW000273.
Shepherd, S. G. and B. T. Kress (2007), Comment on "Applications for Deployed High Temperature Superconducting Coils in Spacecraft Engineering: A Review and Analysis" by J. C. Cocks et al., JOURNAL OF THE BRITISH INTERPLANETARY SOCIETY, VOL. 60, PAGES 129--132.
Shepherd, S. G. (2007), Polar Cap Potential Saturation: Observations, Theory, and Modeling, J. Atmos. Solar-Terr. Phys., 69, doi:10.1016/j.jastp.2006.07.022, 234-248.
Bristow, W. A., R. A. Greenwald, S. G. Shepherd, and J. M. Hughes (2004), On the observed variability of the cross-polar cap potential, J. Geophys. Res., 109, A02203, doi:10.1029/2003JA010206.
Shepherd, S. G., J. M. Ruohoniemi, and R. A. Greenwald, Direct measurements of the ionospheric convection variability near the cusp/throat, Geophys. Res. Lett., 30(21), 2109, doi:10.1029/2003GL017668, 2003.
Shepherd, S. G. and F. Shubitidze (2003), Method of auxiliary sources for calculating the magnetic and electric fields induced in a layered Earth, J. Atmos. Solar-Terr. Phys., 65(10), 1151-1160, doi:10.1016/S1364-6826(03)00159-7.
Shepherd, S. G., J. M. Ruohoniemi, and R. A. Greenwald, Testing the Hill model of transpolar potential with Super Dual Auroral Radar Network observations, Geophys. Res. Lett., 30(1), 1002, doi:10.1029/2002GL015426, 2003.
Rhuohoniemi, J. M., S. G. Shepherd, and R. A. Greenwald (2002), The response of the high-latitude ionosphere to IMF variations, J. Atmos. Solar-Terr. Phys., 64(2), 159-171.
Shepherd, S. G., R. A. Greenwald, and J. M. Ruohoniemi (2002), Cross polar cap potentials measured with Super Dual Auroral Radar Network during quasi-steady solar wind and interplanetary magnetic field conditions, 107(A7), 1094, doi:10.1029/2001JA000152, 2002.
Greenwald, R. A., S. G. Shepherd, T. S. Sotirelis, J. M. Ruohoniemi, and R. J. Barnes (2002), Dawn and dusk sector comparisons of small-scale irregularities, convection, and particle precipitation in the high-latitude ionosphere, J. Geophys. Res., 107(A9), 1241, doi:10.1029/2001JA000158, 2002.
Ruohoniemi, J., R. Barnes, R. Greenwald, and S. G. Shepherd (2001), The response of the high-latitude ionosphere to the coronal mass ejection event of April 6, 2000: A practical demonstration of space weather nowcasting with the Super Dual Auroral Radar Network HF radars, J. Geophys. Res., 106(A12), 30085-30097.
Shepherd, S. G., and J. Ruohoniemi (2000), Electrostatic potential patterns in the high-latitude ionosphere constrained by SuperDARN measurements, J. Geophys. Res., 105(A10), 23005-23014.
Shepherd, S. G., R. A. Greenwald, and J. M. Ruohoniemi (1999), A possible explanation for rapid, large-scale ionospheric responses to southward turnings of the IMF, Geophys. Res. Lett., 26(20), 3197-3200.
Shepherd, S. G., J. LaBelle, C. Carlson, and G. Rostoker (1999), Latitudinal dynamics of auroral roar emissions, J. Geophys. Res., 104(A8), 17217-17232.
Shepherd, S. G., J. LaBelle, and M. Trimpi (1998), Further investigation of auroral roar fine structure, J. Geophys. Res., 103(A2), 2219-2229.
Yoon, P., A. Weatherwax, T. Rosenberg, J. LaBelle, and S. G. Shepherd (1998), Propagation of medium frequency (1-4 MHz) auroral radio waves to the ground via the Z-mode radio window, J. Geophys. Res., 103(A12), 29267-29275.
Shepherd, S. G., J. LaBelle, R. Doe, M. McCready, and A. Weatherwax (1998), Ionospheric structure and the generation of auroral roar, J. Geophys. Res., 103(A12), 29253-29266.
Shepherd, S. G., J. LaBelle, and M. L. Trimpi (1997), The polarization of auroral radio emissions, Geophys. Res. Lett., 24(24), 3161-3164.
LaBelle, J., S. G. Shepherd, and M. Trimpi (1997), Observations of auroral medium frequency bursts, J. Geophys. Res., 102(A10), 22221-22231.
Letcher Jr., D. M. Shook, and S. G. Shepherd (1995), Relational geometric synthesis: Part 1--framework, COMPUTER-AIDED DESIGN, 27(11): 821-832.

Ellen Pettigrew Cousins

Cousins, E. D. P. and S. G. Shepherd (2012), Statistical maps of small-scale electric field variability in the high-latitude ionosphere, J. Geophys. Res., 117, A12304, doi:10.1029/2012JA017929. (Link to Full Paper)
Cousins, E. D. P. and S. G. Shepherd (2012), Statistical characteristics of small-scale spatial and temporal electric field variability in the high-latitude ionosphere, J. Geophys. Res., 117, A03317, doi:10.1029/2011JA017383. (Link to Full Paper)
Cousins, E. D. P. and S. G. Shepherd (2010), A dynamical model of high-latitude convection derived from SuperDARN plasma drift measurements, J. Geophys. Res., 115, A12329, doi:10.1029/2010JA016017. (Link to Full Paper)
Pettigrew, E. D., S. G. Shepherd, and J. M. Ruohoniemi (2010), Climatological patterns of high-latitude convection in the Northern and Southern hemispheres: Dipole tilt dependencies and interhemispheric comparisons, J. Geophys. Res., 115, A07305, doi:10.1029/2009JA014956. (Link to Full Paper)