1972 - 1979

• Armstrong, T. P., S. M. Krimigis, D. V. Reames, and C. E. Fichtel, A Comparison of Measurements of the Charge Spectrum of Solar Cosmic Rays from Nuclear Emulsions and the Explorer 35 Solid State Detector, J. Geophys. Res., 77, 3607-3612, doi:10.1029/JA077i019p03607, 1972.
• Armstrong, T. P. and S. M. Krimigis, Measurements of the Relative Abundances of Fe-group, He, and M-nuclei during the October 29, 1972 Solar Particle Event, Proc. 13th International Cosmic Ray Conf. (Denver, Colorado, Aug. 17 to Aug. 30, 1973), 2, 1510-1515, 1973.
• Krimigis, S. M., J. W. Kohl, and T. P. Armstrong, The Magnetospheric Contribution to the Quiet Time Low Energy Nucleon Spectrum in the Vicinity of Earth, Geophys. Res. Lett., 2, 457-460, 1975.
• Contributions to the Fourteenth International Cosmic Ray Conference, Johns Hopkins University Applied Physics Laboratory preprint, June 1975.
  • Armstrong, T. P., and S. M. Krimigis, Variations in the Charge Composition of the July 2-12, 1974, Solar Particle Event, Proc. 14th International Cosmic Ray Conference (Munich, Germany, August 15 - 29, 1975) (SP 2.1-8).
  • Chen, G., and T. P. Armstrong, Acceleration of Charged Particles in Obliue MHD Shocks, Proc. 14th International Cosmic Ray Conference (Munich, Germany, August 15 - 29, 1975) (SP 5.3-4).
  • Krimigis, S. M., J. W. Kohl, and T. P. Armstrong, The Quiet-Time Low Energy Nucleon Spectrum in the Vicinity of Earth, Proc. 14th International Cosmic Ray Conference (Munich, Germany, August 15 - 29, 1975) (SP 2.2-7).
  • Krimigis, S. M., E. T. Sarris, and T. P. Armstrong,Observations of Quiet-Time Interplanetary Electron Enhancements of Jovian Origin, Proc. 14th International Cosmic Ray Conference (Munich, Germany, August 15 - 29, 1975) (SP 2.2-2).
  • Sarris, E. T., S. M. Krimigis, and T. P. Armstrong, Observations of Energetic Particles Near Interplanetary MHD Discontinuities, Proc. 14th International Cosmic Ray Conference (Munich, Germany, August 15 - 29, 1975) (SP 5.3-8).
• Armstrong, T. P., S. M. Krimigis, D. Hovestadt, B. Klecker and G. Gloeckler, Observations of Temporal and Spatial Variations in the Fe/O Charge Compositions of the Solar Particle Event of July 4, 1974, Solar Phys., 49, 395-407, doi:10.1007/BF00162460, doi:10.1007/BF00162460, 1976.
• Sarris, E. T., S. M. Krimigis, T. Iijima, C. O. Bostrom and T. P. Armstrong, Location of the Source of Magnetospheric Energetic Particle Bursts by Multispacecraft Observations, Geophys. Res. Lett., 3, 437-440, 1976.
• Sarris, E. T., S. M. Krimigis and T. P. Armstrong, Observations of a High Energy Shock Spike in Interplanetary Space, Geophys. Res. Lett., 3, 133-136, 1976.
• Armstrong, T. P., and S. M. Krimigis, Interplanetary Acceleration of Relativistic Electrons Observed with IMP-7, J. Geophys. Res., 81, 677-682, doi:10.1029/JA081i004p00677, 1976.
• Sarris, E. T., S. M. Krimigis and T. P. Armstrong, Observations of Magnetospheric Bursts of High Energy Protons and Electrons at 35 Re with IMP-7, J. Geophys. Res., 81, 2341-2355, doi:10.1029/JA081i013p02341, 1976.
• Kirsch, E., S. M. Krimigis, E. T. Sarris, R. P. Lepping and T. P. Armstrong, Possible Evidence for Large, Transient Electric Fields in the Magnetotail from Oppositely Directed Anisotropies of Energetic Protons and Electrons, Geophys. Res. Lett., 4, 137-140, doi:10.1029/GL004i004p00137, 1977.
• Sarris, E. T., S. M. Krimigis, C. O. Bostrom and T. P. Armstrong, Simultaneous Multispacecraft Observations of Energetic Proton and Electron Bursts Inside and Outside the Magnetosphere, J. Geophys. Res., 83, 4289-4305, doi:10.1029/JA083iA09p04289, 1978.
• Armstrong, T. P., S. M. Krimigis and R. P. Lepping, Magnetosheath Bursts of Predominantly Medium Nuclei Observed with IMP-8 on February 16, 1974, J. Geophys. Res., 83, 5198-5206, doi:10.1029/JA083iA11p05198, 1978.
• Zwickl, R. D., E. C. Roelof, R. E. Gold, S. M. Krimigis and T. P. Armstrong, Z-rich Solar Particle Event Characteristics 1972-1976, Astrophys. J., 225, 281-303, doi:10.1086/156491, 1978.
• Briggs, P. R., T. P. Armstrong and S. M. Krimigis, Hydrogen over Helium Enhancement in Successive Solar Flare Particle Events from the Same Active Region, Astrophys. J. Lett., 228, L83, doi:10.1086/182909, 1979.
• Decker, R. B. and T. P. Armstrong, A Study of Solar Electron Events from October 1972 through December 1974 from IMPs 7 and 8, J. Geophys. Res., 84, 7334-7347, doi:10.1089/JA084iA12p07334, 1979.

1980 - 1989

• Burlaga, L., R. Lepping, R. Weber, T. Armstrong, C. Goodrich, J. Sullivan, D. Gurnett, P. Kellogg, E. Keppler, F. Mariani, F. Neubauer, and R. Schwenn, Interplanetary Particles and Fields, November 22-December 6, 1977: Helios, Voyager, and IMP Observations between 0.6 and 1.6 AU, J. Geophys. Res., 85, 2227-2242, 1980.
• Nonnast, J. H., T. P. Armstrong, and J. W. Kohl, A Study of Solar Flare Soft X-Rays and Their Relation to Particle Events Observed with IMP-8, J. Geophys. Res., 87, 4327-4337, 1982.
• Pesses, M. E., R. B. Decker, and T. P. Armstrong, The Acceleration of Charged Particles in Interplanetary Shock Waves, Space Science Rev., 32, 185-204, 1982.
• Kutchko, F. J., P. R. Briggs, and T. P. Armstrong, The Bidirectional Particle Events of October 12, 1977 Possibly Associated with a Magnetic Loop, J. Geophys. Res., 87, 1419-1431, 1982.
• Laird, C. M., E. J. Zeller, T. P. Armstrong, and B. C. Parker, Solar Activity and Nitrate Deposition in South Pole Snow, Geophys. Res. Lett., 9, 1195-1198, 1982.
• Lui, A. T. Y., S. M. Krimigis, and T. P. Armstrong, Association Between Magnetic Field Fluctuations and Energetic Particle Bursts in the Earth's Magnetotail, J. Geophys. Res., 87, 8315-8320, 1982.
• Briggs, P. R., and T. P. Armstrong, Observations of Interplanetary Energetic Ion Enhancements Near Magnetic Sector Boundaries, Geophys. Res. Lett., 11, 27-30, 1984.
• Shields, J. E., T. P. Armstrong, S. Eckes, and P. R. Briggs, Solar and Interplanetary Ions at 2 to 4 MeV/nucleon during Solar Cycle 21: Systematic Variations of H/He and He/CNO Ratios and Intensities, J. Geophys. Res., 90, 9439-9453, 1985.
• Tholen, S. M., T. P. Armstrong, and L. J. Lanzerotti, Correlation of Geomagnetic Storm Sudden Commencement with Triggered Magnetospheric Particle Bursts, J. Geophys. Res., 91, 13717-13722, 1986.
• Kutchko, F. W., T. P. Armstrong, and Bernard Yu, Numerical Modelling of Proton and Electron Bursts in a Realistic Magnetotail, J. Geophys. Res., 92, 3234-3242, 1987.
• Armstrong, T. P., C. M. Laird, D. Venkatesan, S. Krishnaswamy, and T. J. Rosenberg, Interplanetary Energetic Ions and Polar Radio Wave Absorption, J. Geophys. Res., 94, 3543-3554, doi:10.1029/JA094iA04p03543, 1988.

1990 - Present

• Feynman, J., T. P. Armstrong, L. Dao-Gibner, and S. Silverman, New Interplanetary Proton Fluence Model, J. Spacecraft, 27, 403, 1990.
• Feynman, J., T. P. Armstrong, L. Dao-Gibner, and S. Silverman, Solar Proton Events During Solar Cycles 19, 20, and 21, Solar Physics, 126, 385, doi:10.1007/BF00153058, 1990.
• Boufaida, Moncef, and T. P. Armstrong, Spatial Variations of 0.2 to 5 MeV Protons in the 1-5 AU In-Ecliptic Region From Ulysses, Voyager 1 and 2, and IMP 8 Gradient Studies, J. Geophys. Res., 102, 7013, 1997.
• Vitt, F. M., T. P. Armstrong, T. E. Cravens, G. A. M. Dreschhoff, C. H. Jackman, and C. M. Laird, Computed Contributions to Odd Nitrogen Concentrations in the Earth's Polar Middle Atmosphere by Energetic Charged Particles, J. Atmospheric and Solar Terrestrial Physics, 62, 669, doi:10.1016/S1364-6826(00)00048-1, 2000.
• Patterson, J. D., T. P. Armstrong, C. M. Laird, D. L. Detrick, and A. T. Weatherwax, Correlation of Solar Energetic Protons and Polar Cap Absorption, J. Geophys. Res., 106, 149, doi:10.1029/2000JA002006, 2001.
• Simunac, K. D. C., and T. P. Armstrong, Solar Cycle Variations in Solar and Interplanetary Ions Observed with Interplanetary Monitoring Platform 8, J. Geophys. Res., 109, A10101, doi: 10.1029/2003JA010194, 2004.