Publications

Simon Shepherd

Kelley, I. J., B. S. R. Kunduri, J. B. H. Baker, J. M. Ruohoniemi, S. G. Shepherd (2023), Storm Time Electrified MSTIDs Observed over Mid-Latitude North America, J. Geophys. Res., doi:10.1029/2022JA031115.
Bristow, W. A., L. R. Lyons, Y. Nishimura, S. G. Shepherd and E. F. Donovan (2022), High-latitude plasma convection based on SuperDARN observations and the locally divergence free criterion, J. Geophys. Res., 127, e2022JA030883, doi:10.1029/2022JA030883.
Wang, Y., P. T. Jayachandran, Y.-Z. Ma, Q. Zhang, Z.-Y. Xing, J. M. Ruohoniemi, S. G. Shepherd and M. Lester (2022), Dependencies of GPS scintillation indices on the ionospheric plasma drift and rate of change of TEC around the dawn sector of the polar ionosphere, J. Geophys. Res., 127, e2022JA030870, doi:10.1029/2022JA030870.
Shi, X., D. Lin, W. Wang, J. B. H. Baker, J. M. Weygand, M. D. Hartinger, V. G. Merkin, J. M. Ruohoniemi, K. Pham, H. Wu, V. Angelopoulos, K. A. McWilliams, N. Nishitani, S. G. Shepherd (2022), Geospace concussion: Global reversal of ionospheric vertical plasma drift in response to a sudden commencement, Geophys. Res. Lett., 49, e2022GL100014, doi:10.1029/2022GL100014.
Kunduri, B. S. R., J. B. H. Baker, J. M. Ruohoniemi, E. G. Thomas, and S. G.. Shepherd (2022), An examination of SuperDARN backscatter modes using machine learning guided by ray-tracing, Space Weather, 20, doi:10.1029/2022SW003130.
Thomas, E. G. and S. G. Shepherd (2022), Virtual height characteristics of ionospheric and ground scatter observed by mid-latitude SuperDARN HF rdars, Radio Sci., 57, doi:10.1029/2022RS007429.
Zou, Y., L. Lyons, X. Shi, J. Liu, Q. Wu, M. Conde, S. G. Shepherd, S. Mende, Y. Zhang, A. Coster (2022), Effects of Subauroral Polarization Streams on the Upper Thermospheric Winds during Non-Storm Time, J. Geophys. Res., doi:10.1029/2021JA029988.
Nishimura, Y., J. Goldstein, C. Martinis, Q. Ma, W. Li, S. R. Zhang, A. J. Coster, S. Mrak, J. L. Semeter, N. Nishitani, J. M. Ruohoniemi, S. G. Shepherd (2022), Multi-Scale Density Structures in the Plasmaspheric Plume During a Geomagnetic Storm, J. Geophys. Res., doi:10.1029/2021JA030230.
Workayehu, A. B., H. Vanhamaki, A. T. Aikio, S. G. Shepherd (2021), Effect of Interplanetary Magnetic Field on Hemispheric Asymmetry in Ionospheric Horizontal and Field-Aligned Currents During Different Seasons, J. Geophys. Res., 126(10), doi:10.1029/2021JA029475.
Kunduri, B. S. R., J. B. H. Baker, J. B. H., J. M. Ruohoniemi, A. J. Coster, S. K. Vines, B. J. Anderson, S. G. Shepherd, A. T. Chartier (2021), An Examination of Magnetosphere-Ionosphere Influences During a SAPS Event, Geophys. Res. Lett., 48(19), doi:10.1029/2021GL095751.
Chisham, G., A. G. Burrell, A. Marchaudon, S. G. Shepherd, E. G. Thomas, and P. V. Ponomarenko (2021), Comparison of interferometer calibration techniques for improved SuperDARN elevation angles, Polar Science, doi:10.1016/j.polar.2021.100638.
Moses, M. L. Moses, L. J. Kordella, G. D. Earle, D. Drob, J. D. Huba, J. M. Ruohoniemi, S. G. Shepherd, and V. Sivakumar (2020), Observations and Modeling Studies of Solar Eclipse Effects on Oblique HF Radio Propagation, Space Weather, doi:10.1029/2020SW002560.
Shepherd, S. G., K. T. Sterne, E. G. Thomas, J. M. Ruohoniemi, J. B. H. Baker, R. T. Parris, T. R. Pedersen, and J. M. Holmes (2020), Bistatic Observations with SuperDARN HF Radars: First Results, Radio Science, 55(8), doi:10.1029/2020RS007121.
Berngardt, O. I., J. M. Ruohoniemi, J.-P. St-Maurice, A. Marchaudon, M. J. Kosch, A. S. Yukimatu, N. Nishitani, S. G. Shepherd, M. F. Marcucci, H. Hu, T. Nagatsuma and M. Lester (2019), Global Diagnostics of Ionospheric Absorption During X-Ray Solar Flares Based on 8- to 20-MHz Noise Measured by Over-the-Horizon Radars, Space Weather, 17(6), doi:10.1029/2018SW002130.
Chakraborty, S., J. B. H. Baker, J. M. Ruohoniemi, B. Kunduri, N. Nishitani and S. G. Shepherd (2019), A Study of SuperDARN Response to Co-occurring Space Weather Phenomena, Space Weather, 17(9), doi:10.1029/2019SW002179.
Wang, Zihan, S. Zou, S. G. Shepherd, J. Liang, J. W. Gjerloev, J. M. Ruohoniemi, B. Kunduri and J. R. Wygant (2019), Multi-instrument Observations of Mesoscale Enhancement of Subauroral Polarization Stream Associated With an Injection, J. Geophys. Res., doi:10.1029/2019JA026535.
Nishitani, N., J. M. Ruohoniemi, M. Lester, J. B. H. Baker, A. V. Koustov, S. G. Shepherd, G. Chisham, T. Hori, E. G. Thomas, R. A. Makarevich, A. Marchaudon, P. Ponomarenko, J. A. Wild, S. E. Milan, W. A. Bristow, J. Devlin, E. Miller, R. A. Greenwald, T. Ogawa, and T. Kikuchi (2019), Review of the accomplishments of mid-latitude Super Dual Auroral Radar Network (SuperDARN) HF radars, Prog Earth Planet Sci, 6:27, doi:10.1186/s40645-019-0270-5.
Hori, T., N. Nishitani, S. G. Shepherd, J. M. Ruohoniemi, M. Connors, M. Teramoto, S. Nakano, K. Seki, N. Takahashi, S. Kasahara, S. Yokota, T. Mitani, T. Takashima, N. Higashio, A. Matsuoka, K. Asamura, Y. Kazama, S.-Y. Wang, S. W. Y. Tam, Y. Miyoshi, I. Shinohara (2018), Substorm-associated ionospheric flow fluctuations during the 27 March 2017 magnetic storm: SuperDARN-Arase conjunction, Geophys. Res. Lett., doi:10.1029/2018GL079777.
Fiori, R. A. D., A. V. Koustov, S. Chakraborty, J. M. Ruohoniemi, D. W. Danskin, D. H. Boteler and S. G. Shepherd (2018), Examining the potential of the Super Dual Auroral Radar Network for monitoring the space weather impact of solar X-ray flares, Space Weather, SWE20750, doi:10.1029/2018SW001905.
Kunduri, B. S. R., J. B. H. Baker, J. M. Ruohoniemi, N. Nishitani, K. Oksavik, P. J. Erickson, A. J. Coster and S. G. Shepherd (2018), A new empirical model of the sub-auroral polarization stream, J. Geophys. Res., JGRA54492, doi:10.1029/2018JA025690.
Shinbori, A., Y. Otsuka, T. Tsugawa, M. Nishioka, A. Kumamoto, F. Tsuchia, S. Matsuda, Y. Kasahra, A. Matsuoka, J. M. Ruohoniemi, S. G. Shepherd and N. Nishitani (2018), Temporal and spatial variations of storm-time mid-latitude ionospheric trough based on global GNSS-TEC and Arase satellite observations, Geophys. Res. Lett., doi:10.1029/2018GL078723.
Berngardt, O. I., J. M. Ruohoniemi, N. Nishitani, S. G. Shepherd, W. A. Bristow, E. S. Miller (2018), Attenuation of decameter wavelength sky noise during x-ray solar flares in 2013-2017 based on the observations of midlatitude HF radars, J. Atmos. and Solar-Terr. Phys., 173, http://doi.org/10.1016/j.jastp.2018.03.022.
Thomas, E. G. and S. G. Shepherd (2018), Statistical patterns of ionospheric convection derived from mid-latitude, high-latitude, and polar SuperDARN HF radar observations, J. Geophys. Res. Space Physics, 123, 3196-3216, doi:10.1002/2018JA025280.
Shepherd, S. G. (2017), Elevation angle determination for SuperDARN HF radar layouts, Radio Sci., 52, doi:10.1002/2017RS006348.
Kunduri, B. S. R., J. B. H. Baker, J. M. Ruohoniemi, E. G. Thomas, S. G. Shepherd, and K. T. Sterne (2017), Statistical characterization of the large-scale structure of the subauroral polarization stream, J. Geophys. Res. Space Physics, 122, 6035-6048, doi:10.1002/2017JA024131.
Lyons, L. R., B. Gallardo-Lacourt, S. Zou, J. M. Weygand, Y. Nishimura, W. Li, M. Gkioulidou, V. Angelopoulos, E. F. Donovan, J. M. Ruohoniemi, B. J. Anderson, S. G. Shepherd, and N. Nishitani (2016), The 17 March 2013 storm: Synergy of observations related to electric field modes and their ionospheric and magnetospheric effects, J. Geophys. Res. Space Physics, 121, 10,880-10,897, doi:10.1002/2016JA023237.
Wu, Q., B. A. Emery, S. G. Shepherd, J. M. Ruohoniemi, N. A. Frissell and J. Semeter, (2015), High-latitude thermospheric wind observations and simulations with SuperDARN data driven NCAR TIEGCM during the December 2006 magnetic storm, J. Geophys. Res., 120, doi:10.1002/2015JA021026.
Prikryl, P., R. Ghoddousi-Fard, E. G. Thomas, J. M. Ruohoniemi, S. G. Shepherd, P. T. Jayachandran, D. W. Danskin, E. Spanswick, Y. Zhang, Y. Jiao and Y. T. Morton, (2015), GPS phase scintillation at high latitudes during geomagnetic storms of 7-17 March 2012-Part 1: The North American sector, Ann. Geophysicae, 33, 6, doi:10.5194/angeo-33-637-2015.
Shepherd, S. G. (2014), Altitude-adjusted corrected geomagnetic coordinates: Definition and functional approximations, J. Geophys. Res., 119, doi:10.1002/2014JA020264.
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.
Coco, I., E. Amata, M. F. Marcucci, D. Ambrosino and S. G. Shepherd (2011), Effects of Abrupt Variations of Solar Wind Dynamic Pressure on the High-Latitude Ionosphere, Int. J. Geophys.}, doi:10.1155/2011/207514.
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 (2003), Direct measurements of the ionospheric convection variability near the cusp/throat, Geophys. Res. Lett., 30(21), 2109, doi:10.1029/2003GL017668.
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 (2003), Testing the Hill model of transpolar potential with Super Dual Auroral Radar Network observations, Geophys. Res. Lett., 30(1), 1002, doi:10.1029/2002GL015426.
Ruohoniemi, 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, doi:10.1016/S1364-6826(01)00081-5.
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.
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.
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, doi:10.1029/2000JA000217.
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, doi:10.1029/2000JA000171.
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, doi:10.1029/1999GL010670.
Shepherd, S. G., J. LaBelle, C. Carlson, and G. Rostoker (1999), Latitudinal dynamics of auroral roar emissions, J. Geophys. Res., 104(A8), 17217-17232, doi:10.1029/1999JA900203.
Shepherd, S. G., J. LaBelle, and M. Trimpi (1998), Further investigation of auroral roar fine structure, J. Geophys. Res., 103(A2), 2219-2229, doi:10.1029/97JA03171.
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, doi:10.1029/1998JA900032.
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, doi:10.1029/98JA02295.
Shepherd, S. G., J. LaBelle, and M. L. Trimpi (1997), The polarization of auroral radio emissions, Geophys. Res. Lett., 24(24), 3161-3164, doi:10.1029/97GL03160.
LaBelle, J., S. G. Shepherd, and M. Trimpi (1997), Observations of auroral medium frequency bursts, J. Geophys. Res., 102(A10), 22221-22231, doi:10.1029/97JA01905.
Letcher Jr., D. M. Shook, and S. G. Shepherd (1995), Relational geometric synthesis: Part 1--framework, COMPUTER-AIDED DESIGN, 27(11): 821-832, doi:10.1016/0010-4485(95)00003-8.

Evan Thomas

Walach, M.-T., A. Grocott, E. G. Thomas, and F. Staples (2022), Dusk-dawn asymmetries in SuperDARN convection maps, J. Geophys. Res. Space Physics, 127, doi:10.1029/2022JA030906.
Prikryl, P., R. G. Gillies, D. R. Themens, J. M. Weygand, E. G. Thomas, and S. Chakraborty (2022), Multi-instrument observations of polar cap patches and traveling ionospheric disturbances generated by solar wind Alfven waves coupling to the dayside magnetosphere, Ann. Geophys., 40, 619-639, doi:10.5194/angeo-40-619-2022.
Kunduri, B. S. R., J. B. H. Baker, J. M. Ruohoniemi, E. G. Thomas, and S. G. Shepherd (2022), An examination of SuperDARN backscatter modes using machine learning guided by ray-tracing, Space Weather, 20, doi:10.1029/2022SW003130.
Zhang, S.-R., Y. Nishimura, P. J. Erickson, E. Aa, H. Kil, Y. Deng, E. G. Thomas, W. Rideout, A. J. Coster, R. Kerr, and J. Vierinen (2022), Traveling ionospheric disturbances in the vicinity of storm enhanced density at midlatitudes, J. Geophys. Res. Space Physics, 127, doi:10.1029/2022JA030429.
Chisham, G., A. G. Burrell, E. G. Thomas, and Y.-J. Chen (2022), Ionospheric boundaries derived from auroral images, J. Geophys. Res. Space Physics, 127, doi:10.1029/2022JA030622.
Thomas, E. G., and S. G. Shepherd (2022), Virtual height characteristics of ionospheric and ground scatter observed by mid-latitude SuperDARN HF rdars, Radio Sci., 57, doi:10.1029/2022RS007429.
Walach, M.-T., A. Grocott, F. Staples, and E. G. Thomas (2022), Super Dual Auroral Radar Network expansion and its influence on the derived ionospheric convection pattern, J. Geophys. Res. Space Physics, 127, doi:10.1029/2021JA029559.
Reistad, J. P., K. M. Laundal, N. Østgaard, A. Ohma, A. G. Burrell, S. M. Hatch, S. Haaland, and E. G. Thomas (2021), Quantifying the lobe reconnection rate during dominant IMF By periods and different dipole tilt orientations, J. Geophys. Res. Space Physics, 126, doi:10.1029/2021JA029742.
Chisham, G., A. G. Burrell, A. Marchaudon, S. G. Shepherd, E. G. Thomas, and P. V. Ponomarenko (2021), Comparison of interferometer calibration techniques for improved SuperDARN elevation angles, Polar Science, 28, 100638, doi:10.1016/j.polar.2021.100638.
Shreedevi, P. R., R. K. Choudhary, S. V. Thampi, S. Yadav, T. K. Pant, Y. Yu, R. M. McGranaghan, E. G. Thomas, A. Bhardwaj, and A. K. Sinha (2020), Geomagnetic storm induced plasma density enhancements in the southern polar ionospheric region: a comparative study using St. Patrick's day storms of 2013 and 2015, Space Weather, 18, doi:10.1029/2019SW002383.
Shepherd, S. G., K. T. Sterne, E. G. Thomas, J. M. Ruohoniemi, J. B. H. Baker, R. T. Parris, T. R. Pedersen, and J. M. Holmes (2020), Bistatic observations with SuperDARN HF radars: First results, Radio Sci., 55, doi:10.1029/2020RS007121.
Fogg, A. R., M. Lester, T. K.Yeoman, A. G. Burrell, S. M. Imber, S. E. Milan, E. G. Thomas, H. Sangha, and B. J. Anderson (2020), An improved estimation of SuperDARN Heppner-Maynard Boundaries using AMPERE data, J. Geophys. Res. Space Physics, 125, doi:10.1029/2019JA027218.
Burrell, A. G., G. Chisham, S. E. Milan, L. Kilcommons, Y.-J. Chen, E. G. Thomas, and B. Anderson (2020), AMPERE polar cap boundaries, Ann. Geophys., 38, 481-490, doi:10.5194/angeo-38-481-2020.
Fæhn Follestad, A., L. B. N. Clausen, E. G. Thomas, Y. Jin, and A. J. Coster (2019), Polar cap patch prediction in the expanding contracting polar cap paradigm, Space Weather, 17, 1570-1583, doi:10.1029/2019SW002276.
Reistad, J. P., K. M. Laundal, N. Østgaard, A. Ohma, E. G. Thomas, S. Haaland, K. Oksavik, and S. E. Milan (2019), Separation and quantification of ionospheric convection sources: 2. The dipole tilt angle influence on reverse convection cells during northward IMF, J. Geophys. Res. Space Physics, 124, 6182-6194, doi:10.1029/2019JA026641.
Shore, R. M., M. P. Freeman, J. C. Coxon, E. G. Thomas, J. W. Gjerloev, and N. Olsen (2019), Spatial variation in the responses of the surface external and induced magnetic field to the solar wind, J. Geophys. Res. Space Physics, 124, 6195-6211, doi:10.1029/2019JA026543.
Shreedevi, P. R., R. K. Choudhary, Y. Yu, and E. G. Thomas (2019), Morphological study on the ionospheric variability at Bharati, a polar cusp station in the southern hemisphere, J. Atmos. Solar-Terr. Phys, 193, 105058, doi:10.1016/j.jastp.2019.105058.
Nishitani, N., J. M. Ruohoniemi, M. Lester, J. B. H. Baker, A. V. Koustov, S. G. Shepherd, G. Chisham, T. Hori, E. G. Thomas, R. A. Makarevich, A. Marchaudon, P. Ponomarenko, J. A. Wild, S. E. Milan, W. A. Bristow, J. Devlin, E. Miller, R. A. Greenwald, T. Ogawa, and T. Kikuchi (2019), Review of the accomplishments of mid-latitude Super Dual Auroral Radar Network (SuperDARN) HF radars, Prog Earth Planet Sci, 6:27, doi:10.1186/s40645-019-0270-5.
Priyadarshi, S., Q.-H. Zhang, E. G. Thomas, L. Spogli, and C. Cesaroni (2018), Polar traveling ionospheric disturbances inferred with the B-spline method and associated scintillations in the Southern Hemisphere, Adv. Space Res., 62, 3249-3266, doi:10.1016/j.asr.2018.08.015.
Thomas, E. G., and S. G. Shepherd (2018), Statistical patterns of ionospheric convection derived from mid-latitude, high-latitude, and polar SuperDARN HF radar observations, J. Geophys. Res. Space Physics, 123, 3196-3216, doi:10.1002/2018JA025280.
Correia, E., L. Spogli, L. Alfonsi, C. Cesaroni, A. M. Gulisano, E. G. Thomas, R. F. H. Ramirez, and A. A. Rodel (2017), Ionospheric F-region response to the 26 September 2011 geomagnetic storm in the Antarctic American and Australian sectors, Ann. Geophys., 35, 1113-1129, doi:10.5194/angeo-35-1113-2017.
Kunduri, B. S. R., J. B. H. Baker, J. M. Ruohoniemi, E. G. Thomas, S. G. Shepherd, and K. T. Sterne (2017), Statistical characterization of the large-scale structure of the subauroral polarization stream, J. Geophys. Res. Space Physics, 122, 6035-6048, doi:10.1002/2017JA024131.
Zou, S., A. J. Ridley, X. Jia, E. Boyd, M. J. Nicolls, A. J. Coster, E. G. Thomas, and J. M. Ruohoniemi (2017), PFISR observation of intense ion upflow fluxes associated with an SED during the 1 June 2013 geomagnetic storm, J. Geophys. Res. Space Physics, 122, 2589-2604, doi:10.1002/2016JA023697.
Coster, A. J., P. J. Erickson, J. C. Foster, E. G. Thomas, J. M. Ruohoniemi, and J. B. H. Baker (2016), Solar Cycle 24 Observations of Storm Enhanced Density and the Tongue of Ionization, in Ionospheric Space Weather: Longitude and Hemispheric Dependencies and Lower Atmosphere Forcing (eds T. Fuller-Rowell, E. Yizengaw, P. H. Doherty, and S. Basu), John Wiley & Sons, Inc, Hoboken, NJ, doi:10.1002/9781118929216.ch6.
Prikryl, P., R. Ghoddousi-Fard, J. M. Weygand, A. Viljanen, M. Connors, D. W. Danskin, P. T. Jayachandran, K. S. Jacobsen, Y. L. Andalsvik, E. G. Thomas, J. M. Ruohoniemi, T. Durgonics, K. Oksavik, E. Spanswick, M. Aquino, and V. Sreeja (2016), GPS phase scintillation at high latitudes during the geomagnetic storm of March 17-18, 2015, J. Geophys. Res. Space Physics, 121, 10,448-10,465, doi:10.1002/2016JA023171.
Zhang, Q. -H., J. Moen, M. Lockwood, I. McCrea, B.-C. Zhang, K. A. McWilliams, Q.-G. Zong, S.-R. Zhang, J. M. Ruohoniemi, E. G. Thomas, M. W. Dunlop, R.-Y. Liu, H. Yang, H.-Q. Hu, and M. Lester (2016), Polar cap patch transportation beyond the classic scenario, J. Geophys. Res. Space Physics, 121, 9063-9074, doi:10.1002/2016JA022443.
Zhang, Q. -H., M. Lockwood, R. Heelis, M. Hairston, J. Liang, I. McCrea, B.-C. Zhang, J. Moen, S.-R. Zhang, Y. Zhang, J. M. Ruohoniemi, M. Lester, E. G. Thomas, R.-Y. Liu, M. W. Dunlop, Y. Liu, and Y.-Z. Ma (2016), Earth's ion upflow associated with polar cap patches: Global and in situ observations, Geophys. Res. Lett., 43, 1845-1853, doi:10.1002/2016GL067897.
Thomas, E. G., J. B. H. Baker, J. M. Ruohoniemi, A. J. Coster, and S.-R. Zhang (2016), The geomagnetic storm time response of GPS total electron content in the North American sector, J. Geophys. Res. Space Physics, 121, 1744-1759, doi:10.1002/2015JA022182.
Prikryl, P., R. Ghoddousi-Fard, J. M. Ruohoniemi, and E. G. Thomas (2015), GPS Phase Scintillation at High Latitudes during Two Geomagnetic Storms, in Auroral Dynamics and Space Weather (eds Y. Zhang and L. J. Paxton), John Wiley & Sons, Inc, Hoboken, NJ, doi:10.1002/9781118978719.ch15.
Joshi, P. P., J. B. H. Baker, J. M. Ruohoniemi, J. J. Makela, D. J. Fisher, B. J. Harding, N. A. Frissell, and E. G. Thomas (2015), Observations of storm time midlatitude ion-neutral coupling using SuperDARN radars and NATION Fabry-Perot interferometers, J. Geophys. Res. Space Physics, 120, 8989-9003, doi:10.1002/2015JA021475.
Thomas, E. G., K. Hosokawa, J. Sakai, J. B. H. Baker, J. M. Ruohoniemi, S. Taguchi, K. Shiokawa, Y. Otsuka, A. J. Coster, J.-P. St.-Maurice, and K. A. McWilliams (2015), Multi-instrument, high-resolution imaging of polar cap patch transportation, Radio Sci., 50, 904-915, doi:10.1002/2015RS005672.
Liu, J., T. Nakamura, L. Liu, W. Wang, N. Balan, T. Nishiyama, M. R. hairston, and E. G. Thomas (2015), Formation of polar ionospheric tongue of ionization during minor geomagnetic disturbed conditions, J. Geophys. Res. Space Physics, 120, 6860-6873, doi:10.1002/2015JA021393.
Walsh, B. M., E. G. Thomas, K.-J. Hwang, J. B. H. Baker, J. M. Ruohoniemi, and J. W. Bonnell (2015), Dense plasma and Kelvin-Helmholtz waves at Earth's dayside magnetopause, J. Geophys. Res. Space Physics, 120, 5560-5573, doi:10.1002/2015JA021014.
Prikryl, P., R. Ghoddousi-Fard, E. G. Thomas, J. M. Ruohoniemi, S. G. Shepherd, P. T. Jayachandran, D. W. Danskin, E. Spanswick, Y. Zhang, Y. Jiao, and Y. T. Morton (2015), GPS phase scintillation at high latitudes during geomagnetic storms of 7-17 March 2012 - Part 1: The North American sector, Ann. Geophys., 33, 636-656, doi:10.5194/angeo-33-637-2015.
Prikryl, P., R. Ghoddousi-Fard, L. Spogli, C. N. Mitchell, G. Li, B. Ning, P. J. Cilliers, V. Sreeja, M. Aquino, M. Terkildsen, P. T. Jayachandran, Y. Jiao, Y. T. Morton, J. M. Ruohoniemi, E. G. Thomas, Y. Zhang, A. T. Weatherwax, L. Alfonsi, G. De Franceschi, and V. Romano (2015), GPS phase scintillation at high latitudes during geomagnetic storms of 7-17 March 2012 - Part 2: Interhemispheric comparison, Ann. Geophys., 33, 657-670, doi:10.5194/angeo-33-657-2015.
Zou, S., M. B. Moldwin, A. J. Ridley, M. J. Nicolls, A. J. Coster, E. G. Thomas, and J. M. Ruohoniemi (2014), On the generation/decay of the storm-enhanced density plumes: Role of the convection flow and field-aligned ion flow, J. Geophys. Res. Space Physics, 119, 8543-8559, doi:10.1002/2014JA020408.
Zou, S., A. J. Ridley, M. B. Moldwin, M. J. Nicolls, A. J. Coster, E. G. Thomas, and J. M. Ruohoniemi (2013), Multi-instrument observations of SED during 24-25 October 2011 storm: Implications for SED formation processes, J. Geophys. Res. Space Physics, 118, 7798-7809, doi:10.1002/2013JA018860.
Prikryl, P., R. Ghoddousi-Fard, B. S. R. Kunduri, E. G. Thomas, A. J. Coster, P. T. Jayachandran, E. Spanswick, and D. W. Danskin (2013), GPS phase scintillation and proxy index at high latitudes during a moderate geomagnetic storm, Ann. Geophys., 31, 805-816, doi:10.5194/angeo-31-805-2013.
Zhang, Q. -H., B.-C. Zhang, M. Lockwood, H.-Q. Hu, J. Moen, J. M. Ruohoniemi, E. G. Thomas, S.-R. Zhang, H.-G. Yang, R.-Y. Liu, K. A. McWilliams, and J. B. H. Baker (2013), Direct Observations of the Evolution of Polar Cap Ionization Patches, Science, 339, 1597-1600, doi:10.1126/science.1231487.
Thomas, E. G., J. B. H. Baker, J. M. Ruohoniemi, L. B. N. Clausen, A. J. Coster, J. C. Foster, and P. J. Erickson (2013), Direct observations of the role of convection electric field in the formation of a polar tongue of ionization from storm enhanced density, J. Geophys. Res. Space Physics, 118, 1180-1189, doi:10.1002/jgra.50116.
Kunduri, B. S. R., J. B. H. Baker, J. M. Ruohoniemi, L. B. N. Clausen, A. Grocott, E. G. Thomas, M. P. Freeman, and E. R. Talaat (2012), An examination of interhemispheric conjugacy in a sub-auroral polarization stream, J. Geophys. Res., 117, A08225, doi:10.1029/2012JA017784.
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. Sazykini (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.

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)