PTYS/LPL Faculty

Jozsef Kota
Jozsef Kota
Senior Research Scientist
Theoretical space physics & space weather, Theoretical astrophysics
Ph.D. 1980, Roland Eotvos University (Budapest)

Kuiper   #419

Years with LPL:  1989 to present


Dr. Kota’s research interest is centered around energetic particles, solar wind, and magnetic fields in the Heliosphere. He conducts theoretical and numerical studies on galactic and anomalous cosmic rays, as well as fast neutral atoms, which offer a unique tool to probe the remote areas of the heliosphere. He has developed a number of numerical codes to model the transport and acceleration of cosmic rays in the interplanetary magnetic field.

Recently, he has been involved in modeling space weather in the Earth’s environment. The aim of this research is to understand, model, and forecast large solar energetic particle (SEP) events; to understand the mechanism how Coronal Mass Ejections drive a shock and accelerate ions to high (often relativistic) energies.

CV for Dr. Kota (PDF)


  • IBEX Guest Investigators: Theory, Hybrid Simulation and Modeling of Energetic: NASA IBEX Guest Investigatorship


IBEX, Guest Investigator
Voyager, Guest Investigator


Ulysses, Guest investigator


NASA ADS Author search: J. Kota


Cohen, O., Drake, J. J., Kóta, J. The Cosmic-Ray Intensity near the Archean Earth 2012ApJ...760...85C

Florinski, V., et al. Cosmic-Ray Diffusion in a Sectored Magnetic Field in the Distant Heliosheath 2012ApJ...754...31F

Kóta, J. Theory and Modeling of Galactic Cosmic Rays: Trends and Prospects 2012SSRv..tmp...12K

Kecskeméty, K., et al. Modulation of the Galactic Low-energy Proton Spectrum in the Inner Heliosphere 2011ApJ...738..173K

Guo, F., Jokipii, J. R., Kota, J. Particle Acceleration by Collisionless Shocks Containing Large-scale Magnetic-field Variations 2010ApJ...725..128G

Kóta, J. Particle Acceleration at Near-perpendicular Shocks: The Role of Field-line Topology 2010ApJ...723..393K

Hsieh, K. C., et al. Thickness of the Heliosheath, Return of the Pick-up Ions, and Voyager 1's Crossing the Heliopause 2010ApJ...718L.185H

Amenomori, M., et al., 'Heliospheric signatures seen in the sidereal anisotropy of high-energy galactic cosmic-ray intensity' AIPC, 1302, 285 (2010)

Jokipii, J.R., J. Giacalone, K.C. Hsieh, and J. Kota, 'Heliospheric signatures seen in the sidereal anisotropy of high-energy galactic cosmic-ray intensity' AIPC, 1302, 92 (2010)

Munakata, K., et al. Sky-Maps of the Sidereal Anisotropy of Galactic Cosmic Ray Intensity and its Energy Dependence 2010aogs...21..211M

Fushishita, A., et al. Drift Effects and the Average Features of Cosmic Ray Density Gradient in CIRS During Successive Two Solar Minimum Periods 2010aogs...21..199F

Munakata, K., et al. Solar Cycle Dependence of the Diurnal Anisotropy of 0.6 TeV Cosmic-ray Intensity Observed with the Matsushiro Underground Muon Detector 2010ApJ...712.1100M

Kecskeméty, K., et al. The decay phase of solar energetic particle events 2009JGRA..11406102K

Hsieh, K. C., et al. A Re-Interpretation of STEREO/STE Observations and Its Consequences 2009ApJ...694L..79H

Czechowski, A., et al. Imaging the heliosheath using HSTOF energetic neutral atoms and Voyager 1 ion data 2008A&A...487..329C

Okazaki, Y., et al. Drift Effects and the Cosmic Ray Density Gradient in a Solar Rotation Period: First Observation with the Global Muon Detector Network (GMDN) 2008ApJ...681..693O

Aschwanden, M. J., et al. Theoretical modeling for the stereo mission 2008SSRv..136..565A

Aschwanden, Markus J., et al, 'Theoretical modeling for the Stereo Mission' Space Sci. Rev., 73 (2006)

Kota, and J.R. Jokipii, 'Implications of the Voyager-1 particle spectra for acceleration at the termination shock', in 'Physics of the Inner Heliosheath, 5th IGPP Symposium, 171 (2006)

Czechowski, A., et al. Estimating the Thickness of the Heliosheath from CELIAS/HSTOF and Voyager 1 Data 2006ApJ...647L..69C

Giacalone, J., Kóta, J. Acceleration of Solar-Energetic Particles by Shocks 2006SSRv..124..277G

Gazis, P. R., et al. ICMEs at High Latitudes and in the Outer Heliosphere. Report of Working Group H 2006SSRv..123..417G

Forbes, T. G., et al. CME Theory and Models 2006SSRv..123..251F

Klecker, B., et al. Energetic Particle Observations 2006SSRv..123..217K

Kota J., W.B. Manchester, J.R. Jokipii, D.L. De Zeeuw, and T.I. Gombosi, 'Simulation of SEP acceleration nd transport at CME driven shocks', in 'Physics of the Collisionless Shocks, 4th IGPP Symposium, 201 (2005)

Munakata, K., et al. On the Upper Limiting Energy of the Solar Diurnal Anisotropy of Galactic Cosmic Ray Intensity 2006aogs....2..125M

Munakata, K., et al. On the Cross-Field Diffusion of Galactic Cosmic Rays into an ICME 2006aogs....2..115M

Tóth, G., et al. Space Weather Modeling Framework: A new tool for the space science community 2005JGRA..11012226T

Manchester, W. B., IV, et al. Coronal Mass Ejection Shock and Sheath Structures Relevant to Particle Acceleration 2005ApJ...622.1225M

Kota, J., and J.R. Jokipii, 'Cosmic ray acceleration and transport around the termination shock', in 'Physics of the Outer Heliosphere, 3rd IGPP Symposium, 272 (2004)

Hsieh, K.C., J. Kota, A. Czechowski, M. Hilchenbach, and A. Shaw, studying the Heliosphere in energetic neutral H and He atoms above 30 keV /amu', in 'Physics of the Outer Heliosphere, 3rd IGPP Symposium, 64 (2004)

Sokolov, I. V., et al. A New Field Line Advection Model for Solar Particle Acceleration 2004ApJ...616L.171S

Jokipii, J. R., Giacalone, J., Kóta, J. Transverse Streaming Anisotropies of Charged Particles Accelerated at the Solar Wind Termination Shock 2004ApJ...611L.141J

Czechowski, A., et al. Anomalous helium ions as the source of energetic helium atoms in the outer heliosphere 2004AdSpR..34..104C

Giacalone, J., Jokipii, J. R., Kóta, J. Particle Acceleration in Solar Wind Compression Regions 2002ApJ...573..845G

Kóta, J., et al. Viewing corotating interaction regions globally using energetic neutral atoms 2001JGR...10624907K

Erdos, G., Balogh, A., Kóta, J. Decay of Magnetic Field Irregularities Observed by Ulysses 2001SSRv...97..221E

Kota, J. and J.R. Jokipii, 'Heliospheric transport of cosmic rays in a heliospheric magnetic field with non-polar coronal holes Space Sci. Rev. , 97, 327, (2001)

Czechowski, A., et al. Anomalous cosmic rays and the generation of energetic neutrals in the region beyond the termination shock 2001A&A...368..622C

Kóta, J., Jokipii, J. R. The anisotropies of galactic cosmic rays: 3-dimensional modeling 2001AdSpR..27..607K

Kóta, J., Jokipii, J. R. 3-D modeling of cosmic-ray transport in the heliosphere: toward solar maximum 2001AdSpR..27..529K

Jokipii, J. R., Kóta, J. Galactic and Anomalous Cosmic Rays in the Heliosphere 2000Ap&SS.274...77J

Smith, E. J., et al. Evidence of a North-South Asymmetry in the Heliosphere Associated with a Southward Displacement of the Heliospheric Current Sheet 2000ApJ...533.1084S

Kóta, J., Jokipii, J. R. Velocity Correlation and the Spatial Diffusion Coefficients of Cosmic Rays: Compound Diffusion 2000ApJ...531.1067K

Kóta, J. Diffusion of energetic particles in focusing fields 2000JGR...105.2403K

Kóta, J. Cooling of Energetic Particles during their Transport along Spiral Field Lines 2000AdSpR..26..853K

Kota, J., L.A. Fisk, J.R.. Jokipii, Yu-Qing Lou, and E.C. Roelof, 'Remote connection of particles at high latitudes to CIR.s', in Corotating Interaction Regions, Kluwer Acad. Publ., pp. 235-245 (1999)

Kota, J., 'Quantitative Estimates of Variations in Propagation Imposed by CIR.s', in Corotating Interaction Regions, Kluwer Acad. Publ., pp. 311-315 (1999)

Lee M.A. and J. Kota, 'Energetic Particle Transport and the Diffusion Tensor', in Corotating Interaction Regions, Kluwer Acad. Publ., pp. 372-375 (1999)

Erdos, G., A. Balogh, and J. Kota, 'Separation of magnetic field lines in the Heliosphere', Proc. Conf. ''Plasma Turbulence and Energetic Particles in Astrophysics": Cracow, Poland 1999, eds: M. Ostrowski and R.. Schlickeiser, p161 (1999)

Kóta, J. Cosmic-ray modulation and anisotropies at high rigidities: Theoretical modeling 1999JGR...104.2499K

Simnett, G. M., et al. Corotating Particle Events 1998SSRv...83..215S

Kóta, J., Jokipii, J. R. Modeling of 3-D Corotating Cosmic-Ray Structures in the Heliosphere 1998SSRv...83..137K

Erdös, G., Balogh, A., Kóta, J. Separation rate of the magnetic field lines observed by ULYSSES at high latitude 1997AdSpR..19..843E

Jokipii, J. R., Kota, J. 3D heliospheric simulations of cosmic rays in the light of Ulysses 1996NCimC..19..921J

Kota, J., Jokipii, J. R. Corotating Variations of Cosmic Rays Near the South Heliospheric Pole 1995Sci...268.1024K

Jokipii, J. R., Kóta, J. Three-Dimensional Cosmic-Ray Simulations: Heliographic Latitude and Current-Sheet Tilt 1995SSRv...72..379J

Kóta, J. Three-dimensional transport of cosmic rays in the heliosphere 1995NuPhS..39A.111K

Kota, J. Three-dimensional transport of cosmic rays in the heliosphere 1995NuPhS..39..111K

Jokipii, J. R., et al. Interpretation and consequences of large-scale magnetic variances observed at high heliographic latitude 1995GeoRL..22.3385J

Kota, J., Jokipii, J. R. Diffusive shock acceleration in the presence of current sheets 1994ApJ...429..385K

Kota, J. Coherent pulses in the diffusive transport of charged particles' 1994ApJ...427.1035K

Jokipii, J. R., Kota, J., Giacalone, J. Prependicular transport in 1- and 2-dimensional shock simulations 1993GeoRL..20.1759J

Kota, J., Jokipii, J. R. Cosmic-ray gradients in the outer heliosphere 1993AdSpR..13..257K

Jokipii, J. R., Kota, J., Merenyi, E. The gradient of galactic cosmic rays at the solar-wind termination shock 1993ApJ...405..782J

Gombosi, T. I., et al. The telegraph equation in charged particle transport 1993ApJ...403..377G

Kota, J., 'A numerical model of the large-scale solar wind in the outer heliosphere', in Solar Wind Seven, eds. E. Marsch and R. Schwenn, Pergamon Press, 205 (1992)

Kota, J., Jokipii, J. R. The role of corotating interaction regions in cosmic-ray modulation 1991GeoRL..18.1797K

Kota, J., 'Diffusion, drifts, and modulation of galactic cosmic rays in the heliophere', in: Physics of the Outer Heliosphere, eds. S. Grzedzielski and D. Page, Pergamon Press, ppl19-131 (1990)

Jokipii, J.R., G. Morfill, and J. Kota, 'Jump conditions for cosmic rays at fluid discontinuities', Astrophys. J. Lett., 345, L67 (1989)

Jokipii, J. R., Kota, J. The polar heliospheric magnetic field 1989GeoRL..16....1J

Jokipii, J. R., Kota, J. Cosmic rays near the heliospheric current sheet. II - An ensemble approach to comparing theory and observation 1986JGR....91.2885J

Christon, S.P., A.C. Cummings, E.C. Stone, K.W. Behannon, L.F. Burlaga, Jokipii, J.R., and J. Kota, 'Differential measurement and model calculation of cosmic ray latitude gradient with respect to the heliospheric current sheet', J. Geophys. Res., 91, 2867 (1986)

Kota, J., Merenyi, E., Erdos, G. Polarity-dependent heliolatitudinal gradient of Galactic cosmic rays 1985ApJ...299..505K

Kota, J., Jokipii, J. R. Effects of drift on the transport of cosmic rays. VI - A three-dimensional model including diffusion 1983ApJ...265..573K

Kota, J., Jokipii, J. R. Cosmic rays near the heliospheric current sheet 1982GeoRL...9..656K

Kota, J., et al. A numerical study of the pitch-angle scattering of cosmic rays 1982ApJ...254..398K

Erdos, G., Kota, J. 50-200 GV cosmic rays at various heliolatitudes 1981AdSpR...1..139E

Kota, J., 'How does the global structure of the interplanetary magnetic field affect cosmic ray modulation?', Adv. Space. Res., 1, 135 (1981)

Kota, J., Owens, A. J. Energy-dependent diffusion of cosmic rays in the dynamical halo model 1980ApJ...237..814K

Erdos, G., Kota, J. Sector structure of the interplanetary magnetic field and anisotropy of 50-1000 GV cosmic rays 1980Ap&SS..67...45E

Kiraly, P., et al. Cosmic-ray anisotropy and the local interstellar medium 1979NCimL..24..249K

Kiraly, P., et al. The anisotropy of cosmic rays from 10 to the 11th to 10 to the 20th eV 1979NCimR...2g...1K

Gombosi, T., et al. Analysis of the complex solar particle event on April 29-30, 1973 1977SoPh...54..441G

Kota, J. Solar influence on galactic cosmic ray anisotropy measurements 1976Natur.260..507K

Kiraly, P., et al. The anisotropy of ultra-high-energy cosmic rays. II - Search for correlations with astronomical objects 1975JPhA....8.2018K

Kota, J. On the second spherical harmonics of the cosmic ray angular distribution 1975JPhA....8.1349K

Gombosi, T., et al. Anisotropy of cosmic radiation in the Galaxy 1975Natur.255..687G

Bell, M. C., Kota, J., Wolfendale, A. W. Origin of energetic cosmic rays. I. Galactic diffusion in the energy range 1014-1017 eV 1974JPhA....7..420B

Kóta, J., Perjés, Z. All Stationary Vacuum Metrics with Shearing Geodesic Eigenrays 1972JMP....13.1695K

Kota, J., A,J. Somogyi, G. Valas, and A. Varga, 'Investigation of the 27-day periodicity of cosmic-ray intensity 40 m w.e. underground', Acta Phys. Hungaricae, 298, 215 (1970)

Kota, J. and A.J. Somogyi, 'Some problems of investigating periodicities in cosmic-ray time series', Acta Phys. Htmgaricae, 27, 523 (1969)

Solt, G., Kóta, J. Elastic form factor for a hindered rotator 1967PhLA...24..542S