BULGARIAN ACADEMY OF SCIENCES

 

SPACE AND SOLAR-TERRESTRIAL RESEARCH INSTITUTE
 
DEPARTMENT OF SPACE PHYSICS
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DEPARTMENT OF SPACE PHYSICS

 

CURRICULUM VITAE

 

Dr. Emiliya Yordanova

 

PhD degree

 

2005 -- PhD in Geophysics, Space Research
PhD in Geophysics, Space Research Center Center, Warsaw
PhD thesis: “Scaling behavior of turbulence in the polar cusp”
Space Research Center, Polish Academy of Science

 

Employment 2003-2008

 

 

2003 - Present

Senior scientist, Space Research Institute, Bulgarian Academy
of Science

2007 - 2009

Postdoc, ISSI, Bern, Switzerland

2005 - 2007

Postdoc, Swedish Institute of Space Physics, Uppsala

2003 - 2005

Visiting researcher, Space Research Center, Warsaw,
5th FP RTN 'Turbulent boundary layers', HPRN-CT-2001-00314

Scientific work

15 publications, 3 invited talks, Member of AGU, EGU, ISSI Team "Comparative study of turbulence and anomalous transport in space and fusion plasmas"

 

Topics:

 

Solar wind and magnetospheric turbulence;
Plasma transport across magnetospheric boundary layers;
Solar wind - magnetosphere - ionosphere coupling.

 

Projects

 

Team leader of ISSI Team "Dispersive cascade and dissipation in collisionless space
plasma turbulence – observations and simulations", 2009-2011.

Member of the ISSI Team “Comparative study of turbulence and anomalous transport in space and fusion plasmas”, Bern, Switzerland, January 2008 - June 2009.

Member of the Research Training Network, “Turbulent Boundary Layers in Geospace Plasmas” of the European Community's Human Potential Programme under contract HPRN-CT-2001-00314 at the Space Research Center, Polish Academy of Science, February 2003 - March 2005.

Collaborations:

A. Balogh and R. von Steiger, International Space Science Institute, Bern, Switzerland A. Vaivads and M. Andre, Swedish Institute of Space Physics, Uppsala, Sweden V. Carbone, S. Perri and L. Sorriso-Valvo, Physics Department, University of Calabria, Italy. Z. Voros, Institute of Astro- and Particle Physics, University of Innsbruck, Innsbruck, Austria A. Noullez, Nice observatory, Nice, France. S. Chapman, Centre for Fusion, Space and Astrophysics in the Physics Department, University of Warwick, UK. S. Savin and L. Zelenyi, Space Research Institute, Moscow, Russia.

Specializations:

Postdoctoral position at the International Space Science Institute, Bern, Switzerland, January 2008 - present.

Postdoctoral position at the Swedish Institute of Space Physics, Uppsala, Sweden, September 2005 – May 2007.

Visiting researcher in the frame of Research Training Network, “Turbulent Boundary Layers in Geospace Plasmas” of the European Community's Human Potential Programme under contract HPRN-CT-2001-00314 at the Space Research Center, Polish Academy of Science, (on leave from Space Research Institute, Bulgarian Academy of Sciences), February 2003 - March 2005.

Business trips:

 

Alfven Workshop on Space Environment Turbulence, Warsaw, 17-21 September 2007.

International school of space science “Turbulence and Waves in Space Plasmas”, L'aquila 9-14 September 2007.

Solar - Terrestrial Interactions from Microscale to Global Models, Sinaia, Romania, 12 -16 June 2007.

COSPAR Capacity Building Workshop “Solar-Terrestrial Interactions: Instrumentation and Techniques”, Sinaia, Romania, 4 -16 June 2007.

 

Main scientific results

Magnetosphere - ionosphere electrodynamics:

Energy input form exterior cusp into the low altitude ionospheric cusp

(conjunction event - Cluster, EISCAT, MIRACLE)

(Yordanova et al., GRL, 34, L04102 doi:10.1029/2006GL028617)

(a) Cluster position in the exterior cusp (Tsyganenko 2001 model)
(b) Cluster magnetic footprints, EISCAT radar and MIRACLE ground-based magnetometers

Conclusions:

1.The particles seen at about 9 Re in the exterior cusp carry an earthward energy flux that corresponds to the observed heating of the F-region;

2.The earthward Poynting flux is more than enough to account for the Joule heating in the E-region.

Plasma turbulence in the near Earth' space 1

Cusp turbulence (POLAR, GEOTAIL)

Conclusions:

1.Turbulence scaling properties are dependent on IMF:

     for Bz > 0, magnetic field turbulence is   Kolmogorov-like (fully developed)

     for Bz < 0, magnetic field turbulence is   intermittent (non-fully developed)

(Yordanova et al., Ann. Geophys., 22, 7, 2431, 2004)

Cusp turbulence is anisotropic and intermittent:

    - different scaling properties parallel and perpendicular to the background magnetic field (B0)

   - monofractal nature parallel to B0 and multifractal - perpendicular to B0
(Yordanova et al., Nonlin.Proc.Gheoph.,12, 817–825, 2005)

Geotail

 Polar Cluster  

 

Plasma turbulence in the near Earth’ space 2

Intermittency evolution in the magnetosheath turbulence (CLUSTER)

 
 

 
Conclusions

1. First time multi-point Cluster observations of development of the intermittent magnetosheath turbulence

2. There is a clear anisotropy of the turbulence with respect to the shock normal

3. There is small intermittency and no anisotropy in the frequency range between 3-10 Hz

4. The turbulence is more intermittent away from the bow shock

(Yordanova et al., Phys. Rev. Lett., 100, 205003, 2008)

 
 
   

 

    
 

 

Plasma turbulence in the solar wind

  
 

Energy input form exterior cusp into the low altitude ionospheric cusp
(conjunction event - Cluster, EISCAT, MIRACLE)

    
Yordanova et al., JGR., 2009JA014067, submitted, 2009) ULYSSES orbit      

Pure slow wind
Slow stream
Pure fast wind
Fast stream

21 data samples
25°S - 80°N, 1.5 – 5.4 AU
 

Conclusions

      

1. Turbulence nature – for different solar wind types is different, because of the different region of origin in the solar corona.
- fast wind – slowly developing turbulence
- slow wind - developed turbulence

2. Intermittency – regardlessly of the type of the solar wind, the turbulence is intermittent.
- least intermittent is the pure fast wind
- most intermittent is the pure slow wind
- fast streams less intermittent than slow streams
    3. Radial evolution – pure fast wind evolves towards MHD-like turbulence and it is the only type showing evolution; higher estimation of flatness.
    4. Solar activity – during and close to solar minimum we can observe different solar wind types; around solar maximum expect turbulence properties similar to the pure slow wind.
         

 

Publications:

 

Yordanova, E., A. Balogh, A. Noulez and R. von Steiger, Turbulence and intermittency in the heliospheric magnetic field in fast and slow solar wind, JGR, DOI: 10.1029/2009JA014067, in press, 2009.

Perri, S., E. Yordanova, V. Carbone, P. Veltri, L. Sorriso-Valvo, R. Bruno, and M. Andre, Magnetic turbulence in space plasmas: scale dependent effects of anisotropy, J. Geophys. Res., doi:10.1029/2008JA013491, in press, 2008.

Yordanova, E., Vaivads A., M. Andre, S. C. Buchert, and Z. Voros,  Magnetosheath plasma turbulence and its spatiotemporal evolution as observed by the Cluster spacecraft, Phys. Rev. Lett., 100, 205003, 10.1103/PhysRevLett.100.205003, 2008.

Yordanova, E., D. Sundkvist, S. C. Buchert, M. Andre, Y. Ogawa, M. Morooka, O. Margithu, O. Amm, A. N. Fazakerley, and H. Reme , Energy input from the exterior cusp into the ionosphere: Correlated ground-based and satellite observations, Geophys. Res. Lett., 34, L04102, doi:10.1029/2006GL028617, 2007.

M. Materassi, A. W. Wernik, E. Yordanova, Determining the verse of magnetic turbulent cascades in the Earth’s magnetospheric cusp via transfer entropy analysis: preliminary  results, Nonlinear Processes in Geophysics, vol. 14, pp. 153–161, 2007.

M. Materassi, A. W. Wernik, E. Yordanova, Statistics in the p-model,  Chaos, Solitons & Fractals, 30, issue 3, 642-655, November 2006.

S. C. Buchert, Y. Ogawa, E. Yordanova, and J.-E. Wahlund, Incoherent scatter radar observations of the cusp ionosphere, in Proceedings of the First Swarm International Science Meeting 3-5 May 2006, Nantes, France (ESA WPP-261, July 2006).

E. Yordanova, J. Bergman, G. Consolini,M. Kretzschmar, B. Popielawska, M. Materassi, M. Roca-Sogorb, K. Stasiewicz and A. W. Wernik, Anisotropic scaling features and complexity in magnetospheric-cusp: a case study, Nonlinear Processes in Geophysics, 12, p. 817, 2005.

Materassi M., L. Alfonsi, G. De Franceschi, C. N. Mitchell, V. Romano, P. Spalla, A. W. Wernik, E. Yordanova, Intermittency and ionospheric scintillations in GPS data, proceedings of the International Workshop on Applications of Wavelets to Real World Problems (IWW2005), 17-18 July 2005, Istanbul (Turkey), editors: A. H. Siddiqi, S. Alsan, M. Rasulov, O. Ogun, Z. Aslan, Istanbul Commerce University Publications.

E. Yordanova, M. Grzesiak, A. W. Wernik, B. Popielawska, and K. Stasiewicz, Multifractal structure of turbulence in the magnetospheric cusp, Ann. Geophys., 22, 7, pp. 2431, 2004.

E. Yordanova, Perri, S., and V. Carbone, Reduced magnetic helicity behavior in different plasma regions of the near Earth' space, JGR , 116, A7 , 2010JA015875, 2011.

Perri, S., Carbone, V., E. Yordanova, Bruno, R. and Balogh, A., Scaling law of the reduced magnetic helicity in fast streams, Planet. Space Sci. , 59(7), p. 575-579, 2011.

L. Sorriso-Valvo, E. Yordanova,and V. Carbone, On the scaling properties of anisotropy of interplanetary magnetic turbulent fluctuations, EPL, 90, 59001, 2010.

Carbone, V., Perri, S., E. Yordanova, Veltri, P., Bruno, R., Khotyaintsev, Y., and Andre M., Sign-singularity of the reduced magnetic helicity in the solar wind plasma, PRL, 104, 181101, 2010.

 
 

 
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