Sasha Ukhorskiy Print


  80201

  Aleksandr.Ukhorskiy@jhuapl.edu

: SES

:   Physicist

:  Heliophysics

  Van Allen Probes

 
2003, PhD in Physics, UMD
1999, MS in Physics, MIPT

Publications: Over 35 publications in refereed journals.

Project Scientist of the Van Allen Probes NASA Mission.

Research Interests Include:

  • Energetic particles in space. Transport, acceleration and loss of energetic ions and relativistic electrons in the inner magnetosphere of Earth and outer planets. Theoretical and numerical analysis of radial transport and loss in the outer electron belt. Mechanisms of ion acceleration at ring current injections, plasma bubbles and dipolarization fronts. Global kinetic modeling of the near-Earth radiation environment. Assimilation of in situ spacecraft measurements into kinetic models of Earth’s radiation belts. Dynamical chaos of energetic electron motion in magnetospheric fields. 
  • Magnetospheric plasma waves. Generation and propagation of ULF (Pc3-5), EMIC and whistler waves in Earth’s magnetosphere. Data analysis and statistical studies of ULF and EMIC wave properties in the inner magnetosphere. Numerical modeling of MHD waves in Earth’s magnetosphere. Computation of EMIC and whistler wave growth rates. Theoretical and numerical analysis of cyclotron wave-particle interactions and local acceleration/loss rates of ring current and radiation belt particles.     
  • Nonlinear processes in space plasmas. Data-derived dynamical models of magnetospheric fields and geomagnetic indices. Nonlinear time series analysis: correlation dimension, delay embedding, local-linear filters, multifractal analysis. Magnetospheric phase transitions: mean-field description of substorms, critical exponents, fluctuation analysis. 
 
AGU Index Category AGU Index Sub-Category
MAGNETOSPHERIC PHYSICS Magnetosphere: inner
SPACE PLASMA PHYSICS Nonlinear phenomena
MAGNETOSPHERIC PHYSICS Radiation belts
SPACE PLASMA PHYSICS Wave/particle interactions
:
2006 - Present
Senior Professional Staff, JHU/APL, Laurel, MD
2012 - Present
Adjunct Professor, Dartmouth College, Hanover, NH
2007 - 2015
Instructor, JHU Whiting School of Engineering, Laurel, MD
2003 - 2006
Postdoctoral Fellow, JHU/APL, Laurel, MD
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The following publication information was downloaded from http://www.researcherId.com/rid/E-6429-2016. Click on the publication title to view details.
Empirical modeling of the storm time innermost magnetosphere using Van Allen Probes and THEMIS data: Eastward and banana currents
:   Stephens, G. K.; Sitnov, M. I.; Ukhorskiy, A. Y.; Roelof, E. C.; Tsyganenko, N. A.; Le, G.
:JAN 2016
: Journal of Geophysical Research-Space Physics
  121
  157
  170
: WOS:000371146900012
: None
Spatial structure and temporal evolution of energetic particle injections in the inner magnetosphere during the 14 July 2013 substorm event
:   Gkioulidou, Matina; Ohtani, S.; Mitchell, D. G.; Ukhorskiy, A. Y.; Reeves, G. D.; Turner, D. L.; Gjerloev, J. W.; Nose, M.; Koga, K.; Rodriguez, J. V.; Lanzerotti, L. J.
:MAR 2015
: Journal of Geophysical Research-Space Physics
  120
  1924
  1938
: WOS:000353237600031
: None
Link between premidnight second harmonic poloidal waves and auroral undulations: Conjugate observations with a Van Allen Probe spacecraft and a THEMIS all-sky imager
:   Motoba, T.; Takahashi, K.; Ukhorskiy, A.; Gkioulidou, M.; Mitchell, D. G.; Lanzerotti, L. J.; Korotova, G. I.; Donovan, E. F.; Wygant, J. R.; Kletzing, C. A.; Kurth, W. S.; Blake, J. B.
:MAR 2015
: Journal of Geophysical Research-Space Physics
  120
  1814
  1831
: WOS:000353237600024
: None
Global storm time depletion of the outer electron belt
:   Ukhorskiy, A. Y.; Sitnov, M. I.; Millan, R. M.; Kress, B. T.; Fennell, J. F.; Claudepierre, S. G.; Barnes, R. J.
:APR 2015
: Journal of Geophysical Research-Space Physics
  120
  2543
  2556
: WOS:000354894800014
: None
Preferential acceleration of heavy ions in the reconnection outflow region Drift and surfatron ion acceleration
:   Artemyev, A. V.; Zimbardo, G.; Ukhorskiy, A. Y.; Fujimoto, M.
:FEB 2014
: Astronomy & Astrophysics
  562
  --
  --
: WOS:000332161800070
: None
The role of small-scale ion injections in the buildup of Earth's ring current pressure: Van Allen Probes observations of the 17 March 2013 storm
:   Gkioulidou, Matina; Ukhorskiy, A. Y.; Mitchell, D. G.; Sotirelis, T.; Mauk, B. H.; Lanzerotti, L. J.
:SEP 2014
: Journal of Geophysical Research-Space Physics
  119
  --
  --
: WOS:000344810200023
: None
Enhanced radial transport and energization of radiation belt electrons due to drift orbit bifurcations
:   Ukhorskiy, A. Y.; Sitnov, M. I.; Millan, R. M.; Kress, B. T.; Smith, D. C.
:JAN 2014
: Journal of Geophysical Research-Space Physics
  119
  163
  170
: WOS:000333028600016
: None
Rotationally driven 'zebra stripes' in Earth's inner radiation belt
:   Ukhorskiy, A. Y.; Sitnov, M. I.; Mitchell, D. G.; Takahashi, K.; Lanzerotti, L. J.; Mauk, B. H.
:MAR 20 2014
: Nature
  507
  338
  +
: WOS:000333029000029
: None
Acceleration of ions in the Jupiter magnetotail: Particle resonant interaction with dipolarization fronts
:   Artemyev, A. V.; Kasahara, S.; Ukhorskiy, A. Y.; Fujimoto, M.
:JUL 2013
: Planetary and Space Science
  82-83
  134
  148
: WOS:000321088400012
: None
Global characteristics of electromagnetic ion cyclotron waves: Occurrence rate and its storm dependence
:   Keika, Kunihiro; Takahashi, Kazue; Ukhorskiy, Aleksandir Y.; Miyoshi, Yoshizumi
:JUL 2013
: Journal of Geophysical Research-Space Physics
  118
  4135
  4150
: WOS:000325073600018
: None
Science Objectives and Rationale for the Radiation Belt Storm Probes Mission
:   Mauk, B. H.; Fox, N. J.; Kanekal, S. G.; Kessel, R. L.; Sibeck, D. G.; Ukhorskiy, A.
:NOV 2013
: Space Science Reviews
  179
  3
  27
: WOS:000326381300002
: None
Radiation Belt Storm Probes Ion Composition Experiment (RBSPICE)
:   Mitchell, D. G.; Lanzerotti, L. J.; Kim, C. K.; Stokes, M.; Ho, G.; Cooper, S.; Ukhorskiy, A.; Manweiler, J. W.; Jaskulek, S.; Haggerty, D. K.; Brandt, P.; Sitnov, M.; Keika, K.; Hayes, J. R.; Brown, L. E.; Gurnee, R. S.; Hutcheson, J. C.; Nelson, K. S.; Paschalidis, N.; Rossano, E.; Kerem, S.
:NOV 2013
: Space Science Reviews
  179
  263
  308
: WOS:000326381300008
: None
Dynamics of Radiation Belt Particles
:   Ukhorskiy, A. Y.; Sitnov, M. I.
:NOV 2013
: Space Science Reviews
  179
  545
  578
: WOS:000326381300016
: None
Rapid acceleration of protons upstream of earthward propagating dipolarization fronts
:   Ukhorskiy, A. Y.; Sitnov, M. I.; Merkin, V. G.; Artemyev, A. V.
:AUG 2013
: Journal of Geophysical Research-Space Physics
  118
  4952
  4962
: WOS:000324992300022
: None
Nonlinear Radial Transport in the Earth's Radiation Belts
:   Kress, B. T.; Hudson, M. K.; Ukhorskiy, A. Y.; Mueller, H. -R.; Summers, D; Mann, IR; Baker, DN; Schulz, M
:2012
: Dynamics of the Earth's Radiation Belts and Inner Magnetosphere
  199
  151
  160
: WOS:000321935300012
: None
Forecasting of global data-binning parameters for high-resolution empirical geomagnetic field models
:   Sitnov, M. I.; Ukhorskiy, A. Y.; Stephens, G. K.
:SEP 18 2012
: Space Weather-the International Journal of Research and Applications
  10
  --
  --
: WOS:000309135600001
: None
The role of drift orbit bifurcations in energization and loss of electrons in the outer radiation belt
:   Ukhorskiy, A. Y.; Sitnov, M. I.; Millan, R. M.; Kress, B. T.
:SEP 10 2011
: Journal of Geophysical Research-Space Physics
  116
  --
  --
: WOS:000294799400006
: None
Radiation belt storm probes: Resolving fundamental physics with practical consequences
:   Ukhorskiy, Aleksandr Y.; Mauk, Barry H.; Fox, Nicola J.; Sibeck, David G.; Grebowsky, Joseph M.
:JUL 2011
: Journal of Atmospheric and Solar-Terrestrial Physics
  73
  1417
  1424
: WOS:000294093500017
: None
Spatial distribution of relativistic electron precipitation during a radiation belt depletion event
:   Millan, R. M.; Yando, K. B.; Green, J. C.; Ukhorskiy, A. Y.
:OCT 19 2010
: Geophysical Research Letters
  37
  --
  --
: WOS:000283545100004
: None
Empirical modeling of a CIR-driven magnetic storm
:   Sitnov, M. I.; Tsyganenko, N. A.; Ukhorskiy, A. Y.; Anderson, B. J.; Korth, H.; Lui, A. T. Y.; Brandt, P. C.
:JUL 30 2010
: Journal of Geophysical Research-Space Physics
  115
  --
  --
: WOS:000280590200003
: None
Rapid scattering of radiation belt electrons by storm-time EMIC waves
:   Ukhorskiy, A. Y.; Shprits, Y. Y.; Anderson, B. J.; Takahashi, K.; Thorne, R. M.
:MAY 1 2010
: Geophysical Research Letters
  37
  --
  --
: WOS:000277252400006
: None
Radial transport of radiation belt electrons due to stormtime Pc5 waves
:   Ukhorskiy, A. Y.; Sitnov, M. I.; Takahashi, K.; Anderson, B. J.
:2009
: Annales Geophysicae
  27
  2173
  2181
: WOS:000266406300034
: None
Dynamical data-based modeling of the storm-time geomagnetic field with enhanced spatial resolution
:   Sitnov, M. I.; Tsyganenko, N. A.; Ukhorskiy, A. Y.; Brandt, P. C.
:JUL 30 2008
: Journal of Geophysical Research-Space Physics
  113
  --
  --
: WOS:000258156400005
: None
Timing analysis of the relationship between solar wind parameters and geosynchronous Pc5 amplitude
:   Takahashi, Kazue; Ukhorskiy, Aleksandr Y.
:DEC 5 2008
: Journal of Geophysical Research-Space Physics
  113
  --
  --
: WOS:000261476700005
: None
SPECIAL ISSUE Dynamic Variability of Earth's Radiation Belts Preface
:   Ukhorskiy, A. Y.; O'Brien, T. P.; Sibeck, D. G.
:NOV 2008
: Journal of Atmospheric and Solar-Terrestrial Physics
  70
  V
  --
: WOS:000261538700001
: None
Radial transport in the outer radiation belt due to global magnetospheric compressions
:   Ukhorskiy, Aleksandr Y.; Sitnov, Mikhail I.
:NOV 2008
: Journal of Atmospheric and Solar-Terrestrial Physics
  70
  1714
  1726
: WOS:000261538700004
: None
Solar wind control of Pc5 pulsation power at geosynchronous orbit
:   Takahashi, Kazue; Ukhorskiy, Aleksandr Y.
:NOV 10 2007
: Journal of Geophysical Research-Space Physics
  112
  --
  --
: WOS:000250856300001
: None
Storm time evolution of the outer radiation belt: Transport and losses
:   Ukhorskiy, A. Y.; Anderson, B. J.; Brandt, P. C.; Tsyganenko, N. A.
:NOV 1 2006
: Journal of Geophysical Research-Space Physics
  111
  --
  --
: WOS:000241868100006
: None
Impact of ULF oscillations in solar wind dynamic pressure on the outer radiation belt electrons
:   Ukhorskiy, AY; Anderson, BJ; Takahashi, K; Tsyganenko, NA
:MAR 31 2006
: Geophysical Research Letters
  33
  --
  --
: WOS:000236729700001
: None
Storm time dawn-dusk asymmetry of the large-scale Birkeland currents
:   Anderson, BJ; Ohtani, SI; Korth, H; Ukhorskiy, A
:DEC 21 2005
: Journal of Geophysical Research-Space Physics
  110
  --
  --
: WOS:000234368300003
: None
Roles of chaos, self-organized criticality and phase transitions in magnetospheric physics
:   Sitnov, MI; Ukhorskiy, AY; Sharma, AS; Weigel, RS; Lui, ATY; Kamide, Y; Consolini, G
:2005
: Multiscale Coupling of Sun-Earth Processes
  --
  195
  215
: WOS:000234140700015
: None
Impact of toroidal ULF waves on the outer radiation belt electrons
:   Ukhorskiy, AY; Takahashi, K; Anderson, BJ; Korth, H
:OCT 1 2005
: Journal of Geophysical Research-Space Physics
  110
  --
  --
: WOS:000232512800003
: None
Data-derived forecasting model for relativistic electron intensity at geosynchronous orbit
:   Ukhorskiy, AY; Sitnov, MI; Sharma, AS; Anderson, BJ; Ohtani, S; Lui, ATY
:MAY 8 2004
: Geophysical Research Letters
  31
  --
  --
: WOS:000221333700004
: None
Global and multi-scale features of solar wind-magnetosphere coupling: From modeling to forecasting
:   Ukhorskiy, AY; Sitnov, MI; Sharma, AS; Papadopoulos, K
:APR 16 2004
: Geophysical Research Letters
  31
  --
  --
: WOS:000221076300002
: None
Combining global and multi-scale features in a description of the solar wind-magnetosphere coupling
:   Ukhorskiy, AY; Sitnov, MI; Sharma, AS; Papadopoulos, K
:SEP 2003
: Annales Geophysicae
  21
  1913
  1929
: WOS:000189047300002
: None
Global and multiscale aspects of magnetospheric dynamics in local-linear filters
:   Ukhorskiy, AY; Sitnov, MI; Sharma, AS; Papadopoulos, K
:NOV 2002
: Journal of Geophysical Research-Space Physics
  107
  --
  --
: WOS:000180360500036
: None
Observations of electromagnetic ion cyclotron waves during geomagnetic storms: Wave occurrence and pitch angle scattering
:   Erlandson, RE; Ukhorskiy, AJ
:MAR 1 2001
: Journal of Geophysical Research-Space Physics
  106
  3883
  3895
: WOS:000167264000024
: None
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