Presentations

Seminars (see also seminar slides)

  1. How to infer electric field properties from trapped particle flux measurements, LASP, UC Boulder, CO, online seminar “Friends of Magnetospheres”, May, 2021.
  2. How to Use Particle Measurements to Infer Electric Fields, NASA Goddard Heliophysics Science Division Virtual Seminar, April, 2021.
  3. Fast and Cheap (but not so bad!) Quantification for Electromagnetic Radial Diffusion, Van Allen Probes Science Working Group telecon, Feb 2020.
  4. Everything You Always Wanted to Know about Radial Diffusion* – *But were afraid to ask, University of Helsinki, Finland, Nov, 2019.
  5. Sixty Years of Radial Diffusion Research in the Earth’s Radiation Belts – Is it Time for a Paradigm Shift?, Rice University, TX, Nov, 2019.
  6. Energetic Electron Injections Deep Into The Inner Magnetosphere: a Result of the SubAuroral Polarization Stream (SAPS) Potential Drop, Cambridge, UK, Jul 2018.
  7. Radial Diffusion: a Statistical Description for Radiation Belt Transport, London, UK, Jul 2018.
  8. Radial Diffusion: a Statistical Description for Radiation Belt Transport, Cambridge, UK, Jun 2018
  9. Energetic Electron Injections Deep Into The Inner Magnetosphere: a Result of the SubAuroral Polarization Stream (SAPS) Potential Drop, S. Lejosne, B.S.R. Kunduri and F.S. Mozer, Van Allen Probes Science Working Group telecon, Dec 2017.
  10. What can we learn from Van Allen Probe measurements of the electric drift in the inner magnetosphere?, LASP Friends of the Magnetosphere Seminar, Boulder, CO, Sep 2017.
  11. “The zebra stripes”: An imprint of ionospheric winds on Radiation Belts, LASP Friends of the Magnetosphere Seminar, Boulder, CO, Feb 2016.
  12. “The zebra stripes”: An imprint of ionospheric winds on Radiation Belts, Space Physics Seminar, University of California, Berkeley, CA, Jan 2016.
  13. Radial diffusion, stochastic transport, and non-diffusive process in the radiation belts and slot region: A Tutorial, IWEPPNES, Paris, France, May 2015.
  14. Contribution of a scale changing technique to the characterization of radial diffusion, APL/JPU, Laurel, MD, Oct 2014.
  15. Contribution of a scale changing technique to the characterization of radial diffusion, Space Physics Seminar, University of California, Berkeley, CA, Mar 2014.
  16. Radial diffusion modeling: a key step in the description of the radiation belt dynamics, Research Institute in Astrophysics and Planetology, Toulouse, France, Oct 2012.
  17. Investigation of the characteristic energy of auroral electrons based on ALIS observations, Swedish Institute of Space Physics, Kiruna, Sweden, Jul 2009.

Scientific Conferences

Invited Talks

  1. “On the Importance of Contextualizing Nonlinear Wave-Particle Interactions to Determine the Dominant Pathways to Radiation Belt Acceleration” AGU Fall Meeting, Chicago, IL, Dec. 2022
  2. “Quantifying Radial Transport from High Energy Resolution Electron Flux Measurements in the Earth’s Inner Belt and Slot Region”, USNC URSI RSM ’21, Honolulu, Hawaii, Aug 2021
  3. “The Magnetospheric “Zebra Stripes”: A Tracer of Near-Earth Space Dynamics” S.Lejosne and F.S. Mozer. [EGU Highlight]. EGU General Assembly, Apr. 2021
  4. Deciphering the Earth’s Magnetospheric “Zebra Stripes”: Recent Advances and Perspectives, S.Lejosne and F.S. Mozer. AGU Fall Meeting, San Francisco, CA, virtual, Dec. 2020
  5. A Synthesis of Radial Diffusion Research to Advance Diffusion-Driven Radiation Belt Models, S. Lejosne, AGU Fall Meeting, San Francisco, CA, Dec. 2019
  6. Electric Drift Morphology According to Van Allen Probes Measurements, S.Lejosne and F.S. Mozer,  Plasmasphere Cloak Workshop, Los Alamos, NM, September 2018
  7. How SuperDARN can help advance radiation belt science, S.Lejosne et al., SuperDARN workshop, Banyuls-sur-Mer, France, Spain, June 2018
  8. Van Allen Probe Database of Near-Equatorial Electric Drift Measurements: the Gateway to Informed Modeling of Plasma Transport in the Earth’s Inner Magnetosphere ,S. Lejosne, and F.S. Mozer, 2nd URSI AT-RASC, Gran Canaria, Spain, May 2018
  9. What Can Be Learned from the Van Allen Probe Measurements of the Electric Drift in the Inner Magnetosphere?, S. Lejosne and F. Mozer, AGU Fall Meeting, San Francisco, California, Dec 2016 

Panelist

  1. “In–Situ III — Environment & Electromagnetic Wave-Based Sensors” Heliophysics 2050 Measurement Techniques and Technologies Workshop, Feb 2022.
  2. “Radial Transport vs Local Acceleration: The Long-standing Debate”, VGEM Meeting, Jul. 2021

Contributed Presentations

  1. Current Status of Grotifer Development, Lejosne et al., HESTO Technology Symposium, virtual, Oct 2023 (talk)
  2. A New Diffusive Radiation Belt Model that Resolves the Drift Phase, S. Lejosne and J.M. Albert, GEM Workshop, San Diego, CA, June 2023 (poster)
  3. Characteristic Times for Radiation Belt Drift Phase Mixing, S. Lejosne and J.M. Albert, EGU General Assembly, Vienna, Austria, Apr 2023 (talk)
  4. Investigating Differences in Electromagnetic Radial Diffusion Estimates, Liu, Blaze and Lejosne, AGU Fall Meeting, Chicago, IL, Dec 2022 (student lead poster)
  5. Disturbance Electric fields: A Source of Energetic Particle Precipitation in the Low-Latitude Ionosphere?, AGU Fall Meeting, Chicago, IL, Dec 2022 (poster, highlighted)
  6. Novel methodology to evaluate radial diffusion from global magnetospheric simulation, H.George et al., AGU Fall Meeting, Chicago, IL, Dec 2022 (talk)
  7. PILOT (Plasma Imaging, LOcal measurement, and Tomographic experiment): a mission concept for ground-breaking system-science observations of mass and energy flow through Earth’s magnetosphere, Malaspina et al., AGU Fall Meeting, Chicago, IL, Dec 2022 (poster)
  8. Energetic Electron Dynamics in the Inner Radiation Belt and Below During the September 2017 Geomagnetic Storm, TESS Meeting, Bellevue/Seattle, WA, August 2022 (poster)
  9. Drift loss cone filling and energetic electron dynamics in the inner radiation belt and below during the September 2017 Storm, GEM Workshop, Honolulu, HI, June 2022 (talk)
  10. ‘Radial vs local acceleration’ challenge, GEM Workshop, Honolulu, HI, June 2022 (poster)
  11. Estimating radial diffusion using a hybrid-Vlasov simulation, Harriet George et al., EGU General Assembly, May 2022
  12. Grotifer: A New Electric Field Instrument Design to Address the Need for Highly Accurate Three-Component Electric Field Measurements Throughout The Heliosphere, S. Lejosne, J. W. Bonnell, F. S. Mozer, D. H. Pankow, Heliophysics 2050, Measurement Techniques and Technologies Workshop, February 23–25, 2022, Virtual (poster)
  13. PILOT: Plasma Imaging, LOcal measurement, and Tomographic experiment, a mission concept for
    transformational multi–scale observations of plasma dynamics in the Earth’s magnetosphere, D. M. Malaspina, R. E. Ergun, J. Goldstein, L. Andersson, J. Borovsky, X. Chu, D. Gallagher, V. Jordanova, S. Lejosne, N. Maruyama, J. McFadden, S. Thaller, B. Walsh, C. Spittler, B. Unruh, J. Link, J. Parker, L. DeMoudt, Heliophysics 2050, Measurement Techniques and Technologies Workshop, February 23–25, 2022, Virtual (poster)
  14. Meet Grotifer: a CubeSat that Will Provide Highly Accurate Three-Component Electric Field Measurements throughout the Heliosphere, SH019, Lejosne et al., AGU Fall Meeting, New Orleans, Dec. 2021 (poster)
  15. Inferring Electric Field Dynamics and Radial Transport from Fluctuations in Differential Electron Fluxes Measured in the Earth’s Inner Radiation Belt and Slot Region, SM010, Lejosne, AGU Fall Meeting, New Orleans, Dec. 2021 (highlighted talk)
  16. Thermospheric Neutral Winds as a Driver of the Earth’s Inner Radiation Belt, Lejosne et al., VGEM Meeting, Jul 2021 (poster)
  17. Evaluating Different Magnetic Indices as Inputs for a Representative Model of Radial Diffusion, Fatmasiefa F. (student lead), VGEM Meeting, Jul 2021 (poster)
  18. Thermospheric Neutral Winds: A Driver of the Earth’s Inner Radiation Belt to Be Reckoned With. S.Lejosne et al. (talk) [EGU Highlight]. EGU General Assembly, Apr. 2021
  19. Methodology for calculation of radial diffusion coefficients for a relativistic electron population from hybrid-Vlasov simulation. Harriet George et al. (talk) EGU General Assembly, Apr. 2021
  20. “Operational High-Definition Description of Radiation Belt Radial Diffusion” , S.Lejosne, Space Weather Workshop 2021, virtual meeting, April 2021 (Poster to download here)
  21. Zebra stripes’ in the Earth’s inner belt and slot region: Recent Advances and Perspectives, S. Lejosne and F.S. Mozer, VGEM Meeting, virtual meeting, July 2020 (poster with video presentation)
  22. First Experimental Detection of Radiation Belt “Zebra Stripe” Pattern Generation,  S. Lejosne, B. Kunduri and F.S. Mozer, AGU Fall Meeting, San Francisco, CA, Dec. 2019 (talk)
  23. The Seasonal Dependence of the Electric Drift Velocity Below L = 3 as Seen from the Van Allen Probes, E. Tiano, S. Lejosne and F.S. Mozer, AGU Fall Meeting, San Francisco, CA, Dec. 2019 (poster)
  24. Radial Diffusion Misconceptions, S.Lejosne, GEM Workshop, Santa Fe, NM, June 2019 (poster)
  25. Electric Drift Morphology, S.Lejosne and F.S. Mozer,  CEDAR Workshop, Santa Fe, NM, June 2019 (poster)
  26. What Can We Learn from the Van Allen Probe Measurements of the Electric Drift in the Inner Magnetosphere? –An Update, S. Lejosne and F. Mozer, 32ND URSI-GASS meeting, Montreal, Canada, Aug 2017 (poster)
  27. What Can We Learn from the Van Allen Probe Measurements of the Electric Drift in the Inner Magnetosphere? –An Update, S. Lejosne and F. Mozer, GEM Workshop, Portsmouth, Virginia, Jun 2017 (poster)
  28. A statistical study of the duration of SAPS-like features based on Van Allen Probes measurements, S. Lejosne and F. Mozer, GEM Workshop, Portsmouth, Virginia, Jun 2017 (talk)
  29. Typical values of the electric drift below L = 3 as determined from Van Allen Probe measurements, S.Lejosne and F. Mozer, Van Allen Probes SWG Meeting, Baltimore, MD, Oct 2016 (talk)
  30. Modulations of the electric drift below L~3 due to the ionosphere dynamo, S. Lejosne and F. Mozer, GEM-CEDAR Workshop, Jun 2016 (talk)
  31. Van Allen Probe measurements of the electric drift ExB/B2 at Arecibo’s L = 1.4 field line coordinate, S. Lejosne and F. Mozer, GEM-CEDAR, Jun 2016 (poster)
  32. Measurements of the ExB drift below L~3, S. Lejosne and F. Mozer, Van Allen Probes SWG meeting, Baltimore, MD, Apr 2016 (talk)
  33. Field-Aligned Electron Events Observed in the Radiation Belts by the HOPE instruments aboard the Van Allen Probes,S. Lejosne, O. Agapitov and F. Mozer, AGU Fall Meeting, San Francisco, California, Dec 2015 (poster)
  34. A statistical study of field-aligned electron events, S. Lejosne, F. Mozer and O. Agapitov, Van Allen Probes SWG meeting, Baltimore, MD, Jul 2015 (talk)
  35. Multiple Observations of auroral brightening in conjunction with keV-field aligned electrons and time domain structures in the outer radiation belt, S. Lejosne, O. Agapitov, H. Frey and F. Mozer, GEM meeting, Jun 2015 (poster)
  36. The role of Time-domain structures in precipitating electrons: Conjugate measurements by Van Allen Probes, THEMIS, and the North-American array of all-sky imagers, S. Lejosne, F. Mozer and O. Agapitov, IMC III Meeting, UCLA, CA, Mar 2015 (talk)
  37. The role of time-domain structures in precipitating electrons: conjugate measurements by Van Allen Probes and the Canadian array of all-sky imagers, Lejosne S., Mozer, F.S., Agapitov, O., AGU Fall Meeting, San Francisco, California, Dec 2014 (poster)
  38. Quel est le rôle des champs électriques induits dans la dynamique des ceintures de radiation terrestres, Lejosne, S., PNST 2014, Sète, France, Feb 2014 (talk)
  39. Deriving radiation belt electromagnetic radial diffusion coefficients based on Van Allen Probes, Lejosne S., Boscher D., Maget V. and Rolland G., GEM workshop, Snowmass, Colorado, Jun 2013 (talk)
  40. A two-point sampling method for a new derivation of electromagnetic radial diffusion coefficients, Lejosne S., Boscher D., Maget V. and Rolland G., GEM workshop, Snowmass, Colorado, Jun 2013 (poster)
  41. Modeling of the radial diffusion process, Lejosne S., Boscher D. and Maget V., PNST 2012, La Londe-les-Maures, France, Mar 2012 (poster)
  42. Radial diffusion modeling, Lejosne S., Boscher D. and Maget V., IMC II, Los Angeles, California, Mar 2012 (poster)