Aponte, N., S. A. González, M. C. Kelley, C. A. Tepley, X. Pi, and B. Iijima, Advection of the equatorial anomaly over Arecibo by small-storm related disturbance dynamo electric fields, Geophys. Res. Lett., 27(18), 2,833, 2000.

Aponte, N., M. P. Sulzer, and S. A. González, Correction of the Jicamarca electron-ion temperature ratio problem: Verifying the effect of electron Coulomb collisions on the incoherent scatter spectrum, J. Geophys. Res., 106, 24,785-24,794, 2001.

Aponte et al.(2005)

Aponte, N., M. J. Nicolls, S. A. González, M. P. Sulzer, M. C. Kelley, E. Robles, and C. A. Tepley, Instantaneous electric field measurements and derived neutral winds at Arecibo, Geophys. Res. Lett., 32(L12107), doi:10.1029/2005GL022609, 2005.

Aponte et al.(2007)

Aponte, N., M. P. Sulzer, M. J. Nicolls, R. Nikoukar, and S. A. Sixto, Molecular ion composition measurements in the F1 region at Arecibo, J. Geophys. Res., 112(A6), doi:10.1029/2006JA012028, 2007.

Berkey et al.(1990)

Berkey, J. E., A. D. Richmond, R. M. Barnes, S. González, and C. A. Tepley, Solar cycle variations in F region electrodynamic drifts at Arecibo, J. Geophys. Res., 95, 4,303-4,306, 1990.

Biondi et al.(1990)

Biondi, M. A., J. W. Meriwether Jr., B. G. Fejer, and S. A. González, Seasonal Variations in the equatorial thermospheric wind measured at Arequipa, Peru, J. Geophys. Res., 95, 12,243-12,250, 1990.

Biondi et al.(1991)

Biondi, M. A., J. W. Meriwether Jr., B. G. Fejer, S. A. González, and D. C. Hallenbeck, Equatorial thermospheric wind changes during the solar cycle: Measurements at Arequipa, Peru, from 1983 to 1990, J. Geophys. Res., 96, 15,917-15,930, 1991.

Bishop et al.(2002)

Bishop, R. L., G. D. Earle, S. A. González, M. P. Sulzer, and S. C. Collins, Inferred vertical ion drifts associated with intermediate layers, J. Atmos. Solar Terr. Phys., 64, 1,471-1,477, 2002.

Buonsanto et al.(1999a)

Buonsanto, M., S. A. González, X. Pi, J. M. Ruohoniemi, M. P. Sulzer, W. Swartz, J. Thayer, and D. N. Yuan, Radar Chain Study of the May, 1995 Storm, J. Atmos. Solar Terr. Phys., 61, 233-248, 1999a.

Buonsanto et al.(1999b)

Buonsanto, M. J., S. A. González, G. Lu, B. Reinish, and J. P. Thayer, Coordinated incoherent scatter radar study of the January, 1997 storm, J. Geophys. Res., 104, 24,625-24,637, 1999b.

Collins et al.(2002)

Collins, S. C., J. M. C. Plane, M. C. Kelley, T. G. Wright, P. Soldán, T. J. Kane, A. J. Gerrard, B. W. Grime, R. J. Rollason, J. S. Friedman, S. A. González, Q. Zhou, M. P. Sulzer, and C. A. Tepley, A study of the role of ion-molecule chemistry in the formation of sporadic sodium layers, J. Atmos. Terr. Phys., 64, 845-860, 2002.

Djuth et al.(2004)

Djuth, F. T., M. P. Sulzer, S. A. Gonzalez, J. D. Mathews, J. H. Elder, and R. L. Walterscheid, A continuum of gravity waves in the Arecibo thermosphere?, Geophys. Res. Lett., 31(L16801), doi:10.1029/2003GL019376, 2004.

Earle et al.(2000)

Earle, G. D., R. L. Bishop, S. C. Collins, S. A. González, and M. P. Sulzer, Descending layer variability over Arecibo, J. Geophys. Res., 105, 24,951-24,962, 2000.

Fejer et al.(1991)

Fejer, B. G., E. R. de Paula, S. A. González, and R. F. Woodman, Average vertical and zonal F region plasma drifts over Jicamarca, J. Geophys. Res., 96, 13,901-13,906, 1991.

Friedman et al.(2000)

Friedman, J. S., S. A. González, C. A. Tepley, Q. Zhou, M. P. Sulzer, S. C. Collins, and B. W. Grime, Simultaneous atomic and ion layer enhancements observed in the mesopause region over Arecibo during the Coqui II sounding rocket campaign, Geophys. Res. Lett., 27, 449-452, 2000.

Fritts et al.(2006)

Fritts, D. C., D. Janches, D. M. Riggin, R. G. Stockwell, and S. Sulzer, M. P. González, Gravity waves and momentum fluxes in the mesosphere and lower thermosphere using 430 MHz dual-beam measurements at Arecibo: 2. Frequency spectra, momentum fluxes, and variability, J. Geophys. Res., 111(D18), doi:10.1029/2005JD006883, 2006.

González and Sulzer(1996)

González, S. A., and M. P. Sulzer, Detection of He⁺ layering in the topside ionosphere over Arecibo during equinox solar minimum conditions, Geophys. Res. Lett., 23, 2,509-2,512, 1996.

González et al.(2004)

González, S. A., M. P. Sulzer, M. J. Nicolls, and R. B. Kerr, Solar cycle variability of nighttime topside helium ion concentrations over Arecibo, J. Geophys. Res., 109, 7302-+, doi:10.1029/2003JA010100, 2004.

González(1994)

González, S. A., Radar, satellite, and modelling studies of the low latitude protonosphere, Ph.D. thesis, Utah State Univ., Logan, Ut., 1994.

González et al.(1992)

González, S. A., B. G. Fejer, R. A. Heelis, and W. B. Hanson, Ion composition of the topside equatorial ionosphere during solar minimum, J. Geophys. Res., 97, 4,299-4,303, 1992.

González et al.(2005)

González, S. A., M. J. Nicolls, M. P. Sulzer, and N. Aponte, An energy balance studies of the lower topside ionosphere using the Arecibo incoherent scatter radar and heating facilities, J. Geophys. Res., 110(A11), doi:10.1029/2005JA011154, 2005.

Isham et al.(2000)

Isham, B., C. A. Tepley, M. P. Sulzer, Q. H. Zhou, M. C. Kelley, J. S. Friedman, and S. A. González, Upper atmospheric observations at the Arecibo Observatory: Examples obtained using new capabilities, J. Geophys. Res., 105(A8), 18,609-18,637, 2000.

Janches et al.(2006)

Janches, D., D. C. Fritts, D. M. Riggin, and S. Sulzer, M. P. González, Gravity waves and momentum fluxes in the mesosphere and lower thermosphere using 430 MHz dual-beam measurements at Arecibo: 1. Measurements, methods, and gravity waves, J. Geophys. Res., 111(D18), doi:10.1029/2005JD006882, 2006.

Kamalabadi et al.(2002)

Kamalabadi, F., G. Bust, K. Dymond, S. González, P. Bernhardt, S. Chakrabarti, D. cotton, A. Stephan, R. McCoy, S. Budzien, and S. Thonnard, Tomographic studies of aeronomic phenomena using radio and uv techniques, J. Atmos. Solar Terr. Phys., 64, 1,573-1,580, 2002.

Kelley et al.(1999)

Kelley, M. C., J. J. Makela, B. MacPherson, S. A. González, and M. H. Reilly, The first Caribbean ionosphere campaign: incoherent scatter and GPS results, Proc. IES Symp., 1999.

Kelley et al.(2000)

Kelley, M. C., J. J. Makela, A. Saito, N. Aponte, M. Sulzer, and S. A. González, On the electical structure of airglow depletion/height layer bands over Arecibo, Geophys. Res. Lett., 27(18), 2,837-2,840, 2000.

Kerr et al.(2001a)

Kerr, R. B., R. Garcia, H. He, J. Noto, R. S. Lancaster, C. A. Tepley, S. A. González, J. Friedman, R. A. Doe, M. Lappen, and B. McCormack, Secular variability of the geocoronal Balmer $\alpha$ brightness: Magnetic activity and possible human influences, J. Geophys. Res., 106(A12), 28,819-28,830, 2001a.

Kerr et al.(2001b)

Kerr, R. B., R. Garcia, X. He, J. Noto, R. S. Lancaster, C. A. Tepley, S. A. González, J. Friedman, D. R. A., M. Lappen, and B. McCormack, Periodic variations of geocornal Balmer $\alpha$ brightness due to solar-driven exospheric abundance variations, J. Geophys. Res., 106(A12), 28,797-28,818, 2001b.

MacPherson et al.(1998)

MacPherson, B., S. A. González, G. J. Bailey, R. J. Moffett, and M. P. Sulzer, The effects of meridional neutral winds on the O⁺ - H⁺ transition altitude over Arecibo, J. Geophys. Res., 103, 29,183-29,198, 1998.

MacPherson et al.(2000a)

MacPherson, B., S. A. González, X. Pi, M. Kelley, G. J. Bailey, M. P. Sulzer, G. Hajj, M. Buonsanto, and C. Wang, Comparison between SUPIM simulations and measured TEC for the January, 1997 storm, Geophys. Res. Lett., 27, 2,845-2,848, 2000a.

MacPherson et al.(2000b)

MacPherson, B., S. A. González, M. P. Sulzer, G. J. Bailey, F. Djuth, and P. Rodriguez, Measurements of the topside ionosphere over Arecibo during the total solar eclipse of February 26, 1998, J. Geophys. Res., 105, 23,055-23,068, 2000b.

Makela et al.(2000)

Makela, J. J., S. A. González, B. MacPherson, X. Pi, M. C. Kelley, and P. J. Sultan, Intercomparisons of total electron content measurements using the Arecibo incoherent scatter radar and GPS, Geophys. Res. Lett., 27(18), 2,841-2,844, 2000.

Makela et al.(2001)

Makela, J. J., M. C. Kelley, S. A. González, N. Aponte, and R. P. McCoy, Ionospheric topography maps using multiple-wavelength all-sky images, J. Geophys. Res., 106(A12)(29), 29,161-29,174, 2001.

Makela et al.(2003)

Makela, J. J., M. C. Kelley, S. A. Gonzalez, N. Aponte, and J. J. Sojka, Mid-latitude plasma and electric field measurements during space weather month, September 1999, J. Atmos. Solar Terr. Phys., 65(10), 1077-1085, 2003.

Mathews et al.(2001)

Mathews, J. D., S. González, M. P. Sulzer, Q.-H. Zhou, J. Urbina, E. Kudeki, and S. Franke, Kilometer-Scale Layered Structures Inside Spread-F, Geophys. Res. Lett., 28, 4,167, 2001.

Nicolls et al.(2004)

Nicolls, M. J., M. C. Kelley, A. J. Coster, S. A. González, and J. J. Makela, Imaging the structure of a large-scale TID using ISR and TEC data, Geophys. Res. Lett., 31, 9812-+, doi:10.1029/2004GL019797, 2004.

Nicolls et al.(2006a)

Nicolls, M. J., N. Aponte, S. González, M. P. Sulzer, and W. L. Olliver, Daytime F region ion energy balance at arecibo for moderate to high solar flux conditions, J. Geophys. Res., 111(A10), doi:10.1029/2006JA011664, 2006a.

Nicolls et al.(2006b)

Nicolls, M. J., M. P. Sulzer, N. Aponte, R. Seal, R. Nikoukar, and S. González, High-resolution electron temperature measurements using the plasma line asymmetry, Geophys. Res. Lett., 33(18), doi:10.1029/2006GL027222, 2006b.

Noto et al.(1998)

Noto, J., R. B. Kerr, E. M. Shea, L. S. Waldrop, G. Fisher, R. J. Rudy, J. H. Hecht, S. A. González, M. P. Sulzer, and R. Garcia, Evidence for recombination as a significant source of metastable helium, J. Geophys. Res., 103, 11,595-11,604, 1998.

Sojka et al.(2003)

Sojka, J. J., D. C. Thompson, R. W. Schunk, J. V. Eccles, J. J. Makela, M. C. Kelley, S. A. Gonzalez, N. Aponte, and T. W. Bullett, Ionospheric data assimilation: recovery of strong mid-latitudinal density gradients, J. Atmos. Solar Terr. Phys., 65(10), 1087-1097, 2003.

Sulzer and González(1999)

Sulzer, M. P., and S. González, The effect of electron Coulomb collisions on the incoherent scatter spectrum in the F region at Jicamarca, J. Geophys. Res., 104, 22,535-22,552, 1999.

Sulzer and González(1996)

Sulzer, M. P., and S. A. González, Simultaneous measurements of O⁺ and H⁺ temperatures in the topside ionosphere over Arecibo, Geophys. Res. Lett., 23, 3,235, 1996.

Sulzer et al.(2005)

Sulzer, M. P., N. Aponte, and S. A. González, Application of linear regularization methods to Arecibo vector velocities, J. Geophys. Res., 110(A10), doi:10.1029/2005JA011042, 2005.

Swartz et al.(2000)

Swartz, W. E., M. C. Kelley, J. J. Makela, S. C. Collins, E. Kudeki, S. Franke, J. Urbina, N. Aponte, M. P. Sulzer, and S. A. González, Coherent and incoherent scatter radar observations during intense mid-latitude spread F, Geophys. Res. Lett., 27(18), 2,829-2,832, 2000.

Swartz et al.(2002)

Swartz, W. E., S. C. Collins, M. C. Kelley, J. J. Makela, E. Kudeki, S. Franke, J. Urbina, N. Aponte, S. González, M. P. Sulzer, and J. S. Friedman, First observations of an F-region turbulent upwelling coincident with severe E-region plasma and neutral atmosphere perturbations, J. Atmos. Solar Terr. Phys., 64, 1,545-1556,, 2002.

Urbina et al.(2000)

Urbina, J., E. Kudeki, S. J. Franke, S. González, Q. Zhou, and S. C. Collins, 50 MHz radar observations of mid-latitude E-region irregularities at Camp Santiago, Puerto Rico, Geophys. Res. Lett., 27, 2,853-2,856, 2000.

Vlasov et al.(2005)

Vlasov, M. N., M. J. Nicolls, M. C. Kelley, S. M. Smith, N. Aponte, and S. A. González, Modeling of airglow and ionospheric parameters at Arecibo during quiet and disturbed periods in October 2002, J. Geophys. Res., 110(A07303), doi:10.1029/2005JA011074, 2005.

Waldrop et al.(2006)

Waldrop, E., L. S. Kudeki, S. A. González, M. P. Sulzer, R. Garcia, M. Butala, and F. Kamalabadi, Derivation of neutral oxygen density under charge exchange in the midlatitude topside ionosphere, J. Geophys. Res., 111(A11), doi:10.1029/2005JA011496, 2006.

Waldrop et al.(2005)

Waldrop, L. S., R. B. Kerr, S. A. González, M. P. Sulzer, J. Noto, and F. Kamalabadi, Generation of metastable helium and the 1083 nm emission in the upper thermosphere, J. Geophys. Res., 110(A8), doi:10.1029/2004JA010855, 2005.

Wilford et al.(2003)

Wilford, C. R., R. J. Moffett, J. M. Ress, G. J. Bailey, and S. A. González, Comparison of the He⁺ layer observed over Arecibo during solar maximum and solar minimum with CTIP model results, J. Geophys. Res., 108, Art. No. 1452, 2003.