Solar and Heliospheric Research Group

Additional personnel:

  • Federico Fraschetti, Associate Staff Scientist
  • Marcia Neugebauer, Research Scientist (Affiliate)


The Solar and Heliospheric Research Group seeks a greater Understanding of the diverse plasma processes at work throughout our solar system and the universe. Research topics range from the physics of the solar interior and atmosphere to the solar wind, energetic particle transport, and acceleration processes. 


"Interpretation of the Disturbance in Galactic Cosmic Rays Observed on Voyager 1 beyond the Heliopause" J. R. Jokipii, J. Kóta The Astrophysical Journal Letters, Volume 794, Issue 1, article id. L4, 3 pp. (2014) Available Online

"Long-term Variation of the Solar Diurnal Anisotropy of Galactic Cosmic Rays Observed with the Nagoya Multi-directional Muon Detector" K. Munakata, M. Kozai, C. Kato, J. Kóta The Astrophysical Journal, Volume 791, Issue 1, article id. 22, 16 pp. (2014) Available Online

"Are Cosmic Rays Modulated beyond the Heliopause?" J. Kóta, J. R. Jokipii  The Astrophysical Journal, Volume 782, Issue 1, article id. 24, 6 pp. (2014) Available Online

"Global Anisotropies in TeV Cosmic Rays Related to the Sun's Local Galactic Environment from IBEX" N. A. Schwadron, F. C. Adams, E. R. Christian, R. Desiati, P. Frisch, H. O. Funsten, J. R. Jokipii, D. J. McComas, E. Moebius, G. P. Zank Science, Volume 343, Issue 6174, pp. 988-990 (2014) Available Online

"Small-scale Gradients of Charged Particles in the Heliospheric Magnetic Field" F. Guo, J. Giacalone The Astrophysical Journal, Volume 780, Issue 1, article id. 16, 10 pp. (2014)   Available Online

"Association of Suprathermal Particles with Coherent Structures and Shocks" J. A. Tessein, W. H. Matthaeus, M. Wan, K. T. Osman, D. Ruffolo, J. Giacalone The Astrophysical Journal Letters, Volume 776, Issue 1, article id. L8, 4 pp. (2013) Available Online

"Energetic Particle Anisotropies at the Heliospheric Boundary" V. Florinski, J. R. Jokipii, F. Alouani-Bibi, J. A. le Roux The Astrophysical Journal Letters, Volume 776, Issue 2, article id. L37, 5 pp. (2013) Available Online

"The Heliospheric Termination Shock" J. R. Jokipii Space Science Reviews, Volume 176, Issue 1-4, pp. 115-124 (2013) Available Online

"The Acceleration of Thermal Protons at Parallel Collisionless Shocks: Three-dimensional Hybrid Simulations" F. Guo, J. Giacalone The Astrophysical Journal, Volume 773, Issue 2, article id. 158, 8 pp. (2013) Available Online

"Bactericidal action of cold atmospheric plasma in solution" V. Boxhammer, G. E. Morfill, J. R. Jokipii, T. Shimizu, T. Klampfl, Y. -F. Li, J. Koritzer, J. Schlegel, J. L. Zimmermann  New Journal of Physics, Volume 14, Issue 11, id. 113042 (2012) Available Online

"Energetic Charged Particles Associated with Strong Interplanetary Shocks" J. Giacalone The Astrophysical Journal, Volume 761, Issue 1, article id. 28, 12 pp. (2012) Available Online

"The Cosmic-Ray Intensity near the Archean Earth" O. Cohen, J. J. Drake, J.Kóta The Astrophysical Journal, Volume 760, Issue 1, article id. 85, 7 pp. (2012) Available Online

"Removal of Spectro-polarimetric Fringes by Two-dimensional Pattern Recognition" R. Casini, P.G. Judge & T.A. Schad The Astrophysical Journal, Volume 756, Issue 2 (2012) Available Online

"Early-time Velocity Autocorrelation for Charged Particles Diffusion and Drift in Static Magnetic Turbulence" F. Fraschetti & J. Giacalone, The Astrophysical Journal, Volume 755, Issue 2 (2012) Available Online

"Cosmic-Ray Diffusion in a Sectored Magnetic Field in the Distant Heliosheath" V. Florinski, F. Alouani-Bibi, J.Kóta, X. Guo The Astrophysical Journal, Volume 754, Issue 1, article id. 31, 8 pp. (2012) Available Online

"The Acceleration Mechanism of Anomalous Cosmic Rays" J. Giacalone, J.F. Drake & J.R. Jokipii, Space Science Reviews, Online First (2012) Available Online

"Particle Acceleration at a Flare Termination Shock: Effect of Large-scale Magnetic Turbulence" F. Guo, J. Giacalone The Astrophysical Journal, Volume 753, Issue 1, article id. 28, 7 pp. (2012) Available Online

"The Longitudinal Transport of Energetic Ions from Impulsive Solar Flares in Interplanetary Space" J. Giacalone & J.R. Jokipii, The Astrophysical Journal Letters, Volume 751, Issue 2 (2012) Available Online

"Magnetohydrodynamic Fluid Stability in the Presence of Streaming Cosmic Rays" E.J. GreenfieldJ.R. Jokipii & J. Giacalone, Under review for publication in ApJ E-print Available

"Evidence for Polar X-Ray Jets as Sources of Microstream Peaks in the Solar Wind" M. Neugebauer The Astrophysical Journal, Volume 750, Issue 1 (2012) Available Online

"On the Amplification of Magnetic Field by a Supernova Blast Shock Wave in a Turbulent Medium" F. Guo, S.Li, H.Li, J. GiacaloneJ.R. Jokipii & D. Li, The Astrophysical Journal, Volume 747, Issue 2 (2012) Available Online

"Theory and Modeling of Galactic Cosmic Rays: Trends and Prospects" J.Kóta, Space Science Reviews, Online First (2012) Available Online

"Modulation of the Galactic Low-energy Proton Spectrum in the Inner Heliosphere" K. Kecskemety, Yu. I. Logachev, M. A. Zeldovich, J.Kóta The Astrophysical Journal, Volume 738, Issue 2, article id. 173, 10 pp. (2011)

"Time-dependent Perpendicular Transport of Fast Charged Particles in a Turbulent Magnetic Field" F. Fraschetti & J.R. Jokipii, The Astrophysical Journal, Volume 734, Issue 2 (2011) Available Online

"Evidence of Confinement of Solar-energetic Particles to Interplanetary Magnetic Field Lines" E. E. Chollet, J. Giacalone The Astrophysical Journal, Volume 728, Issue 1, article id. 64, 4 pp. (2011) Available Online

"Interaction between inclined current sheets and the heliospheric termination shock" J. Giacalone, D. Burgess  Geophysical Research Letters, Volumn 37, Issue 19, CiteID L19104 (2010) Available Online

"Particle Acceleration by Collisionless Shocks Containing Large-scale Magnetic-field Variations" F. Guo, J. R. Jokipii, J. Kóta The Astrophysical Journal, Volume 725, Issue 1, pp. 128-133 (2010) Available Online

"Effects of interplanetary transport on derived energetic particle source strengths" E. E. Chollet, J. Giacalone, R. A. Mewaldt Journal of Geophysical Research, Volumn 115, Issue A6, Cite ID A06101 (2010) Available Online

"Thickness of the Heliosheath, Return of the Pick-up Ions, and Voyager 1's Crossing the Heliopause" K. C. Hsieh, J. Giacalone, A. Czechowski, M. Hilchenbach, S. Grzedzielski, J. Kóta The Astrophysical Journal Letters, Volume 718, Issue 2, pp. L185-L188 (2010) Available Online

"Superposition of Stochastic Processes and the Resulting Particle Distributions" N. A. Schwadron, M. A. Dayeh, M. Desai, H. Fahr, J. R. Jokipii, M. A. Lee  
 The Astrophysical Journal, Volume 713, Issue 2, pp. 1386-1392 (2010) Available Online

"Compression Acceleration in Astrophysical Plasmas and the Production of f(v) vprop v -5 Spectra in the Heliosphere" J. R. Jokipii, Martin A. Lee The Astrophysical Journal, Volume 713, Issue 1, pp. 475-483 (2010) Available Online

"Solar Cycle Dependence of the Diurnal Anisotropy of 0.6 TeV Cosmic-ray Intensity Observed with the Matsushiro Underground Muon Detector" K. Munakata, Y. Mizoguchi, C. Kato, S. Yasue, S. Mori, M. Takita, J. Kóta The Astrophysical Journal, Volume 712, Issue 2, pp. 1100-1106 (2010) Available Online

"The Origin of Low-energy Anomalous Cosmic Rays at the Solar-wind Termination Shock" J. Giacalone, R. Decker The Astrophysical Journal, Volume 710, Issue 1, pp. 91-96 (2010) Available Online

Solar and Heliospheric Research Group
Graduate Students:
Eric Greenfield
Erica McEvoy
Peng Sun 

National Solar Observatory
Solar Probe Plus
SOHO Community - Meetings
American Geophysical Union
AAS Solar Physics Division
SWPC: Current Space Weather Conditions
Voyager: The Interstellar Mission