Andrew Gerrard

Y. Ogawa, Y. Tanaka, A. Kodokura, K. Hosokawa, Y. Ebihara, T. Motoba, B. Gustavsson, U. Brandstrom, Y. Sato, S. Oyama, M. Ozaki, T. Raita, F. Sigernes, S. Nozawa, K. Shiokawa, M. Kosh, K. Kauristie, C. Hall, S. Suzuki, Y. Miyoshi, Andrew J. Gerrard, H. Miyaoka, R. Fujii. 2020. “Development of low-cost multi-wavelength imager system for studies of aurora and airglow.” Polar Science, vol. 23.

C. Yue, Jacob Bortnik, W. Li, C.-P. Wang, R. M. Thorne, L. Lyons, G. D. Reeves, H. E. Spence, Andrew J. Gerrard, M. Gkioulidou, D. G. Mitchell. 2019. “Oxygen Ion Dynamics in the Earth's Ring Current: Van Allen Probes Observations.” Journal of Geophysical Research: Space Physics, vol. 124, no. 10.

A. Hull, C. Chaston, J. Bonnell, J. Wygant, C. Kletzing, G. Reeves, Andrew J. Gerrard. 2019. “Dispersive Alfvén Wave Control of O+ Ion Outflow and Energy Densities in the Inner Magnetosphere.” Geophysical Research Letters, vol. 46, no. 15, pp. 8597-8606.

B. Wang, Y. Nishimura, H. Zhang, X.-C. Shen, L. Lyons, V. Angelopoulos, Y. Ebihara, A. Weatherwax, Andrew J. Gerrard, H. Frey. 2019. “The 2-D Structure of Foreshock-Driven Field Line Resonances Observed by THEMIS Satellite and Ground-Based Imager Conjunctions.” Journal of Geophysical Research: Space Physics, vol. 124, no. 8, pp. 6792-6811.

I. Kuzichev, A. Soto-Chavez, J. Park, Andrew J. Gerrard, A. Spitkovsky. 2019. “Magnetospheric chorus wave simulation with the TRISTAN-MP PIC code.” Physics of Plasmas, vol. 26, no. 7.

A. Soto-Chavez, L. Lanzerotti, J. Manweiler, Andrew J. Gerrard, R. Cohen, Z. Xia, L. Chen, H. Kim. 2019. “Observational evidence of the drift-mirror plasma instability in Earth's inner magnetosphere.” Physics of Plasmas, vol. 26, no. 4.

C. Yue, C.-W. Jun, J. Bortnik, X. An, Q. Ma, G. Reeves, H. Spence, Andrew J. Gerrard, M. Gkioulidou, M. Gkioulidou, D. Mitchell, C. Kletzing. 2019. “The Relationship Between EMIC Wave Properties and Proton Distributions Based on Van Allen Probes Observations.” Geophysical Research Letters, vol. 46, pp. 4070-4078.

A. R. Soto-Chavez, Louis J Lanzerotti, J. W. Manweiler, Andrew J. Gerrard, R. Cohen, Z. Xia, L. Chen, Hyomin Kim. 2019. “Observational evidence of the drift-mirror plasma instability in Earth's inner magnetosphere.” Physics of Plasmas, vol. 26, no. 4.

N. Frissell, J. Vega, E. Markowitz, Andrew J. Gerrard, W. Engelke, P. Erickson, E. Miller, R. Luetzelschwab, J. Bortnik. 2019. “High-Frequency Communications Response to Solar Activity in September 2017 as Observed by Amateur Radio Networks.” Space Weather, vol. 17, pp. 118-132.

T. Motoba, Y. Ebihara, Y. Ogawa, A. Kadokura, M. Engebretson, V. Angelopoulos, Andrew J. Gerrard, A. Weatherwax. 2019. “On the Driver of Daytime Pc3 Auroral Pulsations.” Geophysical Research Letters, vol. 46, pp. 553-561.

C. Yue, J. Bortnik, W. Li, Q. Ma, M. Gkioulidou, G. Reeves, C.-P. Wang, R. Thorne, A. Lui, Andrew J. Gerrard, H. Spence, D. Mitchell. 2018. “The Composition of Plasma inside Geostationary Orbit Based on Van Allen Probes Observations.” Journal of Geophysical Research: Space Physics, vol. 123, pp. 6478-6493.

S. Khadka, C. Valladares, R. Sheehan, Andrew J. Gerrard. 2018. “Effects of Electric Field and Neutral Wind on the Asymmetry of Equatorial Ionization Anomaly.” Radio Science, vol. 53, pp. 683-698.

N. Frissell, J. Katz, S. Gunning, J. Vega, Andrew J. Gerrard, G. Earle, M. Moses, M. West, J. Huba, P. Erickson, E. Miller, R. Gerzoff, W. Liles, H. Silver. 2018. “Modeling Amateur Radio Soundings of the Ionospheric Response to the 2017 Great American Eclipse.” Geophysical Research Letters, vol. 45, pp. 4665-4674.

H. Kim, Andrew J. Gerrard, L. Lanzerotti, A. Soto-Chavez, R. Cohen, J. Manweiler. 2017. “Ring Current He Ion Control by Bounce Resonant ULF Waves.” Journal of Geophysical Research: Space Physics, vol. 122, no. 12, pp. 12301-12039.

Hyomin Kim, Andrew J. Gerrard, Louis J Lanzerotti, Rualdo Soto-Chavez, Ross J. Cohen, Jerry W. Manweiler. 2017. “Ring Current He Ion Control by Bounce Resonant ULF Waves.” Journal of Geophysical Research: Space Physics, vol. 122, no. 12, pp. 12031-12039.

I. Cohen, D. Mitchell, L. Kistler, B. Mauk, B. Anderson, J. Westlake, S. Ontani, D. Hamilton, D. Turner, B. Blake, J. Fennell, A. Jaynes, T. Leonard, Andrew J. Gerrard, L. Lanzerotti, R. Allen, J. Burch. 2017. “Dominance of high-energy (>150 keV) heavy ion intensities in Earth's middle to outer magnetosphere.” Journal of Geophysical Research: Space Physics, vol. 122, no. 9, pp. 9282-9293.

C. Yue, J. Bortnik, R. Thorne, Q. Ma, X. An, C. Chappell, Andrew J. Gerrard, L. Lanzerotti, Q. Shi, G. Reeves, H. Spence, D. Mitchell, M. Gkioulidou, C. Kletzing. 2017. “The characteristic pitch angle distributions of 1 eV to 600 keV protons near the equator based on Van Allen Probes observations.” Journal of Geophysical Research: Space Physics, vol. 122, pp. 9464-9473.

Ian J. Cohen, Donald G. Mitchell, Lynn M. Kistler, Barry H. Mauk, Brian J. Anderson, Joseph H. Westlake, Shinichi Ohtani, Douglas C. Hamilton, Drew L. Turner, J. Bernard Blake, Joseph F. Fennell, Allison N. Jaynes, Trevor W. Leonard, Andrew J. Gerrard, Louis J Lanzerotti, Robert C. Allen, James L. Burch. 2017. “Dominance of high-energy (>150 keV) heavy ion intensities in Earth's middle to outer magnetosphere.” Journal of Geophysical Research: Space Physics, vol. 122, no. 9, pp. 9282-9293.

Chao Yue, Jacob Bortnik, Richard M. Thorne, Qianli Ma, Xin An, C. R. Chappell, Andrew J. Gerrard, Louis J Lanzerotti, Quanqi Shi, Geoffrey D. Reeves, Harlan E. Spence, Donald G. Mitchell, Matina Gkioulidou, Craig A. Kletzing. 2017. “The Characteristic Pitch Angle Distributions of 1 eV to 600 keV Protons Near the Equator Based On Van Allen Probes Observations.” Journal of Geophysical Research: Space Physics, vol. 122, no. 9, pp. 9464-9473.

R. Cohen, Andrew J. Gerrard, A. R. Soto-Chavez, H. Kim, J. Manweiler. 2017. “Climatology of high-β plasma measurements in Earth's inner magnetosphere.” J. Geophys. Res. Space Physics, vol. 122, pp. 711-726.

Hyomin Kim, C. R. Clauer, Andrew J. Gerrard, M. Engebretson, M. Hartinger, M. Lessard, J. Matzka, D. Sibeck, H. Singer, C. Stolle, D. Weimer, Z. Xu. 2017. “Conjugate observations of electromagnetic ion cyclotron waves associated with traveling convection vortex events.” J. Geophys. Res. Space Physics, vol. 122, pp. 7336-7352.

D. Mehta, Andrew J. Gerrard, Y. Ebihara, A. Weatherwax, L. Lanzerotti. 2017. “Short-period mesospheric gravity waves and their sources at the South Pole.” Atmospheric Chemistry and Physics, vol. 17, pp. 911-919.

Dhvanit Mehta, Andrew J. Gerrard, Yusuke Ebihara, Allan T. Weatherwax, Louis J Lanzerotti. 2017. “Short-period mesospheric gravity waves and their sources at the South Pole.” Atmospheric Chemistry and Physics, vol. 17, no. 2, pp. 911-919.

Ross Cohen, Andrew J. Gerrard, Louis J Lanzerotti, A. R. Soto-Chavez, Hyomin Kim, Jerry W. Manweiler. 2017. “Climatology of high-β plasma measurements in Earth's inner magnetosphere.” Journal of Geophysical Research: Space Physics, vol. 122, no. 1, pp. 711-726.

T. Motoba, Y. Ebihara, A. Kadokura, M. Engebretson, M. Lessard, A. Weatherwax, Andrew J. Gerrard. 2016. “Fast-moving diffuse auroral patches: A new aspect of daytime Pc3 auroral pulsations.” J. Geophys. Res. Space Physics, vol. 122, pp. 1542-1554.

A. Soto-Chavez, L. Lanzerotti, Andrew J. Gerrard, H. Kim, J. Bortnik, J. Manweiler. 2016. “RBSPICE measurement of ion loss during the 2015 March storm: Adiabatic response to the geomagnetic field change.” Journal of Geophysical Research-Space, vol. 121, pp. 9547-9559.

A. R. Soto-Chavez, Louis J Lanzerotti, Andrew J. Gerrard, Hyomin Kim, J. Bortnik, J. W. Manweiler. 2016. “RBSPICE measurement of ion loss during the 2015 March storm: Adiabatic response to the geomagnetic field change.” Journal of Geophysical Research A: Space Physics, vol. 121, no. 10, pp. 9547-9559.

K. Urban, Andrew J. Gerrard, L. Lanzerotti, A. Weatherwax. 2016. “Rethinking the polar cap: Eccentric dipole structuring of ULF power at the highest corrected geomagnetic latitudes.” Journal of Geophysical Research-Space, vol. 121.

Kevin D. Urban, Andrew J. Gerrard, Louis J Lanzerotti, Allan T. Weatherwax. 2016. “Rethinking the polar cap: Eccentric dipole structuring of ULF power at the highest corrected geomagnetic latitudes.” Journal of Geophysical Research: Space Physics, vol. 121, no. 9, pp. 8475-8507.

D. Mehta, Andrew J. Gerrard, Y. Ebihara, A. Weatherwax, L. Lanzerotti. 2016. “Mesospheric gravity waves and their sources at the South Pole.” Atmospheric Chemistry and Physics Discussions.

N. Frissell, J. Baker, J. Ruohoniemi, R. Greenwald, Andrew J. Gerrard, E. Miller, M.-L. West. 2016. “Sources and characteristics of medium-scale traveling ionospheric disturbances observed by high-frequency radars in the North American sector.” Journal of Geophysical Research-Space, vol. 121.

C. C. Chaston, J. W. Bonnell, J. R. Wygant, C. A. Kletzing, G. D. Reeves, Andrew J. Gerrard, Louis J Lanzerotti, C. W. Smith. 2015. “Extreme ionospheric ion energization and electron heating in Alfvén waves in the storm time inner magnetosphere.” Geophysical Research Letters, vol. 42, no. 24, pp. 10531-10540.

C. Chaston, J. Bonnell, J. Wygant, C. Kletzing, G. Reeves, Andrew J. Gerrard, L. Lanzerotti, C. Smith. 2015. “Extreme ionospheric ion energization and electron heating in Alfvén waves in the storm-time inner magnetosphere.” Geophysical Research Letters, vol. 42, no. 24.

D. Baker, A. Jaynes, V. Hoxie, R. Thorne, J. Foster, X. Li, J. Fennell, J. Wygant, S. Kanekal, P. Erickson, W. Kurth, W. Li, Q. Ma, Q. Schiller, L. Blum, D. Malaspina, Andrew J. Gerrard, L. Lanzerotti. 2014. “An Impenetrable Barrier to Ultra-Relativistic Electrons in the Van Allen Radiation Belt.” Nature, vol. 515, pp. 531–534.

Andrew J. Gerrard, L. Lanzerotti, M. Gkioulidou, D. Mitchell, J. Manweiler, J. Bortnik, K. Keika. 2014. “Initial measurements of O-ion and He-ion decay rates observed fromthe Van Allen probes RBSPICE instrument.” J. Geophys. Res: Space Physics, vol. 119, pp. doi: 10.1002/2014JA020374.

N. Frissell, J. Baker, M. Ruohoniemi, Andrew J. Gerrard, E. Miller, J. Marini, M. West, W. Bristow. 2014. “Climatology of medium-scale traveling ionospheric disturbances observed by the midlatitude Blackstone SuperDARN radar.” J. Geophys. Res.: Space Physics, vol. 119, pp. doi:10.1002/2014JA019870.

J. Makela, B. Harding, J. Meriwether, R. Mesquita, S. Sanders, A. Ridley, M. Castellez, M. Ciocca, G. Earle, N. Frissell, D. Hampton, Andrew J. Gerrard, J. Noto, C. Martinas. 2014. “Storm time response of the midlatitude thermosphere: Observations from a network of Fabry-Perot interferometers.” J. Geophys. Res.: Space Physics, vol. 119, pp. doi:10.1002/2014JA019832.

R. Melville, A. Stillinger, Andrew J. Gerrard, A. Weatherwax. 2014. “Sustainable energy at the 100-W level for scientific sites on the Antarctic Plateau: Lessons learned from the PENGUIn-AGO project.” Review of Scientific Instruments, vol. 85, no. 4, pp. id.045117.

Andrew J. Gerrard, L. Lanzerotti, M. Gkioulidou, D. Mitchell, J. Manweiler, J. Bortnik. 2014. “Quiet time observations of He ions in the inner magnetosphere as observed from the RBSPICE instrument aboard the Van Allen Probes mission.” Geophys. Res. Lett., vol. 41.

G. Earle, R. Davidson, R. Heelis, W. Coley, D. Weimer, J. Makela, D. Fisher, Andrew J. Gerrard, J. Meriwether. 2013. “Low latitude thermospheric responses to magnetic storms.” Journal of Geophysical Research, pp. 10.1002/jgra.50212.

Z. Li, S. Naqvi, Andrew J. Gerrard, J. Chau, Y. Bhattacharya. 2012. “Numerical modeling of lower stratospheric Doppler ducted gravity waves over Jicamarca, Peru.” Atmos. Chem. and Phys., vol. 12, pp. 11085-11093.

K. Urban, Andrew J. Gerrard, Y. Bhattacharya, A. Ridley, L. Lanzerotti, A. Weatherwax. 2011. “Quiet time observations of the open‐closed boundary prior to the CIR‐induced storm of 9 August 2008.” Space Weather, vol. 9, no. S11001.

Andrew J. Gerrard, Y. Bhattacharya, J. Thayer. 2011. “Observations of in-situ generated gravity waves during a stratospheric temperature enhancement (STE) event.” Atmos. Chem. Phys., vol. 11, pp. 11913-11917.

Andrew J. Gerrard, J. Meriwether. 2011. “Initial daytime and nighttime SOFDI observations of thermospheric winds from Fabry-Perot Doppler shift measurements of the 630-nm OI line-shape profile.” Annales Geophysicae, vol. 29, pp. 1529–1536.

Z. Li, S. Naqvi, Andrew J. Gerrard, J. Chau, Y. Bhattacharya. 2011. “Numerical modeling of lower stratospheric Doppler ducted gravity waves over Jicamarca, Peru.” Atmos. Chem. and Phys. Discussions, vol. 11, pp. 19011-19027.

Andrew J. Gerrard, Y. Bhattacharya, J. Thayer. 2011. “Observations of in-situ generated gravity waves during a stratospheric temperature enhancement (STE) event.” Atmos. Chem. Phys. Discuss., vol. 11, pp. 14221-14232.

Yajnavalkya Bhattacharya, Andrew J. Gerrard. 2010. “Wintertime mesopause region vertical winds from Resolute Bay.” Journal of Geophysical Research-Atmospheres, vol. 115, no. D00N07.

Andrew J. Gerrard, D. Detrick, S. Mende, L. Lanzerotti, A. Weatherwax, Y. Bhattacharya. 2010. “Photometric observations of 630.0-nm OI and 427.8-nm N2+ emission from South Pole and McMurdo Stations during winter: Analysis of temporal variations spanning minutes to hourly timescales.” Journal of Geophysical Research-Space, vol. 115, no. A8, pp. 10.1029/2009JA014970.

Y. Bhattacharya, Andrew J. Gerrard. 2010. “Correlations of mesospheric winds with subtle motion of the Arctic polar vortex.” Atmos. Chem. Phys., vol. 10, pp. 431-436.