Published work

Albert, J. M., and J. Bortnik, Nonlinear interaction of radiation belt electrons with electromagnetic ion cyclotron waves, Geophys. Res. Lett., VOL. 36, L12110, doi:10.1029/2009GL038904, 2009.
[download]

Bortnik, J., W. Li, R. M. Thorne, V. Angelopoulos, C. Cully, J. Bonnell, O. Le Contel, and A. Roux, An Observation Linking the Origin of Plasmaspheric Hiss to Discrete Chorus Emissions, Science, Vol. 324, Iss. 5928, p. 775, doi:10.1126/science.1171273, 2009.
[download from Science website]

Li, W., R. M. Thorne, V. Angelopoulos, J. Bortnik, C. M. Cully, B. Ni, O. LeContel, A. Roux, U. Auster, and W. Magnes, Global distribution of whistler-mode chorus waves observed on the THEMIS spacecraft, Geophys. Res. Lett., Vol. 36, Iss. 9, CiteID L09104, doi:10.1029/2009GL037595, 2009.
[download]
[GRL cover]

Bortnik, J., R. M. Thorne, and U. S. Inan, Nonlinear interaction of energetic electrons with large amplitude chorus, Geophys. Res. Lett., Vol. 35, Iss. 21, CiteID L21102, doi:10.1029/2008GL035500, 2008.
[download]

Li, W., R. M. Thorne, N. P. Meredith, R. B. Horne, J. Bortnik, Y. Y. Shprits, and B. Ni, Evaluation of whistler mode chorus amplification during an injection event observed on CRRES, J. Geophys. Res., Vol. 113, Iss. A9, CiteID A09210, doi:10.1029/2008JA013129, 2008.
[download]

Bortnik, J., J. W. Cutler, C. Dunson, and T. E. Bleier, The possible statistical relation of Pc1 pulsations to Earthquake occurrence at low latitudes, Ann. Geophys., Vol. 26, Iss. 9, pp. 2825-2836, 2008.
[download]

Nemec, F., O. Santolik, M. Parrot, and J. Bortnik, Power line harmonic radiation observed by satellite: Properties and propagation through the ionosphere, J. Geophys. Res., Vol. 113, Iss. A8, CiteID A08317, doi:10.1029/2008JA013184, 2008.
[download]

Ni, B., R. M. Thorne, Y. Y. Shprits, and J. Bortnik, Resonant scattering of plasma sheet electrons by whistler-mode chorus: Contribution to diffuse auroral precipitation, Geophys. Res. Lett., Vol. 35, Iss. 11, CiteID L11106, doi:10.1029/2008GL034032, 2008.
[download]

Cutler, J., J. Bortnik, C. Dunson, J. Doering, and T. Bleier, CalMagNet – an array of search coil magnetometers monitoring ultra low frequency activity in California, Natural Hazards and Earth System Science, Vol. 8, Iss. 2, pp. 359-368, 2008.
[download]

Kulkarni, P., U. S. Inan, T. F. Bell, and J. Bortnik, Precipitation signatures of ground-based VLF transmitters, J. Geophys. Res., doi:10.1029/2007JA012569, 2008.
[download]

Bortnik, J., R. M. Thorne, and N. P. Meredith, The unexpected origin of plasmaspheric hiss from discrete chorus emissions, Nature, Vol. 452, Iss. 7183, pp. 62-66, 2008.
[download]

Bortnik, J., J. W. Cutler, C. Dunson, T. E. Bleier, and R. L. McPherron, Characteristics of low latitude Pc1 pulsations during geomagnetic storms, J. Geophys. Res., Vol. 113, A04201, doi:10.1029/2007JA012867, 2008.
[download]

Engebretson, M. J., M. R. Lessard, A. T. Weatherwax, D. L. Detrick, J. C. Green, J. Bortnik, J. L. Posch, N. J. Petit, M. C. Rose, and R. B. Horne, Pc1-Pc2 waves and energetic particle precipitation during and after magnetic storms: superposed epoch analysis and case studies, J. Geophys. Res., Vol. 113, Iss. A1, CiteID A01211, 10.1029/2007JA012362, 2008.
[download]

Bortnik, J., R. M. Thorne, and N. P. Meredith, Modeling the propagation characteristics of chorus using CRRES suprathermal electron fluxes, J. Geophys. Res., Vol. 112, Iss. A8, CiteID: A08204, doi:10.1029/ 2006JA012237, 2007.
[download]

Bortnik, J., R. M. Thorne, N. P. Meredth, and O. Santolik, Ray tracing of penetrating chorus and its implications for the radiation belts, Geophys. Res. Lett., Vol. 34, Iss. 15, CiteID L15109, doi:10.1029/2007GL030040, 2007.
[download]

Rodger, C. J., M. A. Clilverd, D. Nunn, P. T. Verronen, J. Bortnik, and E. Turunen, Storm time, short-lived bursts of relativistic electron precipitation detected by subionospheric radio wave propagation, J. Geophys. Res., 112, A07301, doi:10.1029/2007JA012347, 2007.
[download]

Bortnik, J., J. W. Cutler, C. Dunson, and T. E. Bleier, An automatic wave detection algorithm applied to Pc1 pulsations, J. Geophys. Res., Vol. 112, A04204, doi:10.1029/2006JA011900, 2007.
[download]

Bortnik, J., and R. M. Thorne, The dual role of ELF/VLF chorus waves in the acceleration and precipitation of radiation belt electrons, J. Atmos. & Solar-Terr. Phys., Vol. 69, pp. 378-386, 2007.
[download]

Bortnik, J., R. M. Thorne, T. P. O'Brien, J. C. Green, R. J. Strangeway, Y. Y. Shprits, and D. N. Baker, Observation of two distinct, rapid loss mechanisms during the 20 November 2003 radiation belt dropout event, J. Geophys. Res., Vol. 111, A12216, doi:10.1029/2006JA011802, 2006.
[download]

Thorne, R. M., R. B. Horne, V. K. Jordanova, J. Bortnik, and S. Glauert, Interaction of EMIC waves with thermal plasma and radiation belt particles, AGU Monograph, 2006.
[download]

Bortnik J., U. S. Inan, and T. F. Bell, Landau damping and resultant unidirectional propagation of chorus waves, Geophys. Res. Lett., Vol. 33, L03102, doi:10.1029/2005GL024553, 2006.
[download]

Bortnik J., U. S. Inan, and T. F. Bell, Temporal signatures of radiation belt electron precipitation induced by lightning generated MR whistler waves. Part I: Methodology, J. Geophys. Res., Vol. 111, A02204, doi:10.1029/2005JA011182, 2006.
[download]

Bortnik J., U. S. Inan, and T. F. Bell, Temporal signatures of radiation belt electron precipitation induced by lightning generated MR whistler waves. Part II: Global signatures, J. Geophys. Res., Vol. 111, A02205, doi:10.1029/2005JA011398, 2006.
[download]

Bortnik J., U. S. Inan, and T. F. Bell, Frequency-time spectra of magnetospherically reflecting whistlers in the plasmasphere, J. Geophys. Res., 108(A1), 10.1029/2002JA009387, Jan 2003
[download]

Bortnik J., U. S. Inan, and T. F. Bell, Energy distribution and lifetime of magnetospherically reflecting whistlers in the plasmasphere, J. Geophys. Res., Vol. 108, No. A5, 10.1029/2002JA009316, May 2003
[download]

Inan U. S., T. F. Bell, J. Bortnik, Controlled precipitation of radiation belt electrons, J. Geophys. Res., Vol. 108, No. A5, 10.1029/2002JA009580, May 2003
[download]

Bell T. F., U. S. Inan, J. Bortnik, and J. D. Scudder, The Landau damping of magnetospherically reflected whistlers within the plasmasphere, Geophys. Res. Lett., Vol. 29, No. 15, Aug. 2002.
[download]

Bortnik J., U. S. Inan, and T. F. Bell, L-dependence of energetic electron precipitation driven by magnetospherically reflecting whistler waves, J. Geophys. Res., Vol. 107, No. A8, Aug. 2002.
[download]

Blake J. B., U. S. Inan, M. Walt, T. F. Bell, J. Bortnik, D. L. Chenette, and H. J. Christian, Lightning-induced energetic electron flux enhancements in the drift loss cone, J. Geophys. Res., Vol. 106, No. A12, pp. 29,733-29-744, Dec. 2001.
[download]

Lorentzen K. R., J. B. Blake, U. S. Inan, and J Bortnik, Observations of relativistic electron micro-bursts in association with VLF chorus, J. Geophys. Res., Vol. 106, No. A4, p. 6017, Apr. 2001.
[download]

Bortnik J, Compaction technology: could high phase order transmission ever get right of way?, Electricity+Control, July 1998, pp 23-24.

Bortnik J., and J. P. Reynders, Compaction technology: high phase order transmission in the South African context, SAUPEC 98, Proceedings of the Seventh Southern African Universities power engineering conference, pp. 131-134, University of Stellenbosch, 1998

Ph.D. thesis

Bortnik, J., Precipitation of radiation belt electrons by lightning- generated magnetospherically reflecting whistler waves, Stanford University, Palo Alto, CA., ISBN: B000BIHX56, May 2004.
[download]

M.Sc. thesis

Bortnik, J., Transmission line compaction using high phase order transmission, University of the Witwatersrand, Master's research thesis, 1998.
[download]

B.Sc. design and research theses

Bortnik, J. and R. Ehlers, Investigation into partial discharge behavior in non-uniform geometries in SF6 insulated system under slow rising positive pulses, University of the Witwatersrand, Honours year research project, 1996.
[download]

Bortnik, J., Dual speed induction motor, University of the Witwatersrand, Honours year design report, 1996.
[download]


Home About Resume Publications Contact	Published work Albert, J. M., and J. Bortnik, Nonlinear interaction of radiation belt electrons with electromagnetic ion cyclotron waves, Geophys. Res. Lett., VOL. 36, L12110, doi:10.1029/2009GL038904, 2009. [download] Bortnik, J., W. Li, R. M. Thorne, V. Angelopoulos, C. Cully, J. Bonnell, O. Le Contel, and A. Roux, An Observation Linking the Origin of Plasmaspheric Hiss to Discrete Chorus Emissions, Science, Vol. 324, Iss. 5928, p. 775, doi:10.1126/science.1171273, 2009. [download from Science website] Li, W., R. M. Thorne, V. Angelopoulos, J. Bortnik, C. M. Cully, B. Ni, O. LeContel, A. Roux, U. Auster, and W. Magnes, Global distribution of whistler-mode chorus waves observed on the THEMIS spacecraft, Geophys. Res. Lett., Vol. 36, Iss. 9, CiteID L09104, doi:10.1029/2009GL037595, 2009. [download] [GRL cover] Bortnik, J., R. M. Thorne, and U. S. Inan, Nonlinear interaction of energetic electrons with large amplitude chorus, Geophys. Res. Lett., Vol. 35, Iss. 21, CiteID L21102, doi:10.1029/2008GL035500, 2008. [download] Li, W., R. M. Thorne, N. P. Meredith, R. B. Horne, J. Bortnik, Y. Y. Shprits, and B. Ni, Evaluation of whistler mode chorus amplification during an injection event observed on CRRES, J. Geophys. Res., Vol. 113, Iss. A9, CiteID A09210, doi:10.1029/2008JA013129, 2008. [download] Bortnik, J., J. W. Cutler, C. Dunson, and T. E. Bleier, The possible statistical relation of Pc1 pulsations to Earthquake occurrence at low latitudes, Ann. Geophys., Vol. 26, Iss. 9, pp. 2825-2836, 2008. [download] Nemec, F., O. Santolik, M. Parrot, and J. Bortnik, Power line harmonic radiation observed by satellite: Properties and propagation through the ionosphere, J. Geophys. Res., Vol. 113, Iss. A8, CiteID A08317, doi:10.1029/2008JA013184, 2008. [download] Ni, B., R. M. Thorne, Y. Y. Shprits, and J. Bortnik, Resonant scattering of plasma sheet electrons by whistler-mode chorus: Contribution to diffuse auroral precipitation, Geophys. Res. Lett., Vol. 35, Iss. 11, CiteID L11106, doi:10.1029/2008GL034032, 2008. [download] Cutler, J., J. Bortnik, C. Dunson, J. Doering, and T. Bleier, CalMagNet – an array of search coil magnetometers monitoring ultra low frequency activity in California, Natural Hazards and Earth System Science, Vol. 8, Iss. 2, pp. 359-368, 2008. [download] Kulkarni, P., U. S. Inan, T. F. Bell, and J. Bortnik, Precipitation signatures of ground-based VLF transmitters, J. Geophys. Res., doi:10.1029/2007JA012569, 2008. [download] Bortnik, J., R. M. Thorne, and N. P. Meredith, The unexpected origin of plasmaspheric hiss from discrete chorus emissions, Nature, Vol. 452, Iss. 7183, pp. 62-66, 2008. [download] Bortnik, J., J. W. Cutler, C. Dunson, T. E. Bleier, and R. L. McPherron, Characteristics of low latitude Pc1 pulsations during geomagnetic storms, J. Geophys. Res., Vol. 113, A04201, doi:10.1029/2007JA012867, 2008. [download] Engebretson, M. J., M. R. Lessard, A. T. Weatherwax, D. L. Detrick, J. C. Green, J. Bortnik, J. L. Posch, N. J. Petit, M. C. Rose, and R. B. Horne, Pc1-Pc2 waves and energetic particle precipitation during and after magnetic storms: superposed epoch analysis and case studies, J. Geophys. Res., Vol. 113, Iss. A1, CiteID A01211, 10.1029/2007JA012362, 2008. [download] Bortnik, J., R. M. Thorne, and N. P. Meredith, Modeling the propagation characteristics of chorus using CRRES suprathermal electron fluxes, J. Geophys. Res., Vol. 112, Iss. A8, CiteID: A08204, doi:10.1029/ 2006JA012237, 2007. [download] Bortnik, J., R. M. Thorne, N. P. Meredth, and O. Santolik, Ray tracing of penetrating chorus and its implications for the radiation belts, Geophys. Res. Lett., Vol. 34, Iss. 15, CiteID L15109, doi:10.1029/2007GL030040, 2007. [download] Rodger, C. J., M. A. Clilverd, D. Nunn, P. T. Verronen, J. Bortnik, and E. Turunen, Storm time, short-lived bursts of relativistic electron precipitation detected by subionospheric radio wave propagation, J. Geophys. Res., 112, A07301, doi:10.1029/2007JA012347, 2007. [download] Bortnik, J., J. W. Cutler, C. Dunson, and T. E. Bleier, An automatic wave detection algorithm applied to Pc1 pulsations, J. Geophys. Res., Vol. 112, A04204, doi:10.1029/2006JA011900, 2007. [download] Bortnik, J., and R. M. Thorne, The dual role of ELF/VLF chorus waves in the acceleration and precipitation of radiation belt electrons, J. Atmos. & Solar-Terr. Phys., Vol. 69, pp. 378-386, 2007. [download] Bortnik, J., R. M. Thorne, T. P. O'Brien, J. C. Green, R. J. Strangeway, Y. Y. Shprits, and D. N. Baker, Observation of two distinct, rapid loss mechanisms during the 20 November 2003 radiation belt dropout event, J. Geophys. Res., Vol. 111, A12216, doi:10.1029/2006JA011802, 2006. [download] Thorne, R. M., R. B. Horne, V. K. Jordanova, J. Bortnik, and S. Glauert, Interaction of EMIC waves with thermal plasma and radiation belt particles, AGU Monograph, 2006. [download] Bortnik J., U. S. Inan, and T. F. Bell, Landau damping and resultant unidirectional propagation of chorus waves, Geophys. Res. Lett., Vol. 33, L03102, doi:10.1029/2005GL024553, 2006. [download] Bortnik J., U. S. Inan, and T. F. Bell, Temporal signatures of radiation belt electron precipitation induced by lightning generated MR whistler waves. Part I: Methodology, J. Geophys. Res., Vol. 111, A02204, doi:10.1029/2005JA011182, 2006. [download] Bortnik J., U. S. Inan, and T. F. Bell, Temporal signatures of radiation belt electron precipitation induced by lightning generated MR whistler waves. Part II: Global signatures, J. Geophys. Res., Vol. 111, A02205, doi:10.1029/2005JA011398, 2006. [download] Bortnik J., U. S. Inan, and T. F. Bell, Frequency-time spectra of magnetospherically reflecting whistlers in the plasmasphere, J. Geophys. Res., 108(A1), 10.1029/2002JA009387, Jan 2003 [download] Bortnik J., U. S. Inan, and T. F. Bell, Energy distribution and lifetime of magnetospherically reflecting whistlers in the plasmasphere, J. Geophys. Res., Vol. 108, No. A5, 10.1029/2002JA009316, May 2003 [download] Inan U. S., T. F. Bell, J. Bortnik, Controlled precipitation of radiation belt electrons, J. Geophys. Res., Vol. 108, No. A5, 10.1029/2002JA009580, May 2003 [download] Bell T. F., U. S. Inan, J. Bortnik, and J. D. Scudder, The Landau damping of magnetospherically reflected whistlers within the plasmasphere, Geophys. Res. Lett., Vol. 29, No. 15, Aug. 2002. [download] Bortnik J., U. S. Inan, and T. F. Bell, L-dependence of energetic electron precipitation driven by magnetospherically reflecting whistler waves, J. Geophys. Res., Vol. 107, No. A8, Aug. 2002. [download] Blake J. B., U. S. Inan, M. Walt, T. F. Bell, J. Bortnik, D. L. Chenette, and H. J. Christian, Lightning-induced energetic electron flux enhancements in the drift loss cone, J. Geophys. Res., Vol. 106, No. A12, pp. 29,733-29-744, Dec. 2001. [download] Lorentzen K. R., J. B. Blake, U. S. Inan, and J Bortnik, Observations of relativistic electron micro-bursts in association with VLF chorus, J. Geophys. Res., Vol. 106, No. A4, p. 6017, Apr. 2001. [download] Bortnik J, Compaction technology: could high phase order transmission ever get right of way?, Electricity+Control, July 1998, pp 23-24. Bortnik J., and J. P. Reynders, Compaction technology: high phase order transmission in the South African context, SAUPEC 98, Proceedings of the Seventh Southern African Universities power engineering conference, pp. 131-134, University of Stellenbosch, 1998 Ph.D. thesis Bortnik, J., Precipitation of radiation belt electrons by lightning- generated magnetospherically reflecting whistler waves, Stanford University, Palo Alto, CA., ISBN: B000BIHX56, May 2004. [download] M.Sc. thesis Bortnik, J., Transmission line compaction using high phase order transmission, University of the Witwatersrand, Master's research thesis, 1998. [download] B.Sc. design and research theses Bortnik, J. and R. Ehlers, Investigation into partial discharge behavior in non-uniform geometries in SF6 insulated system under slow rising positive pulses, University of the Witwatersrand, Honours year research project, 1996. [download] Bortnik, J., Dual speed induction motor, University of the Witwatersrand, Honours year design report, 1996. [download]