Monday, September 28, 2020 - Friday, October 2, 2020

Leah Bulnes

Center for Nonlinear Studies
Los Alamos National Laboratory

Click here for the final schedule.

There will be no registration fee for this event. To register, either use the button above or email directly to delzanno@lanl.gov. Please indicate your name and affiliation in the email.

The workshop will be fully virtual since the Covid-19 situation remains too uncertain for an in-person meeting. The schedule will be finalized once abstract submission is closed, but the meeting will occur for only 5-6 hours every day to allow for international participation. The reference dates remain September 28th-October 1st 2020 but we might extend it to at least October 2nd to compensate for the shorter daily meeting times.

ABSTRACT SUBMISSION IS OPEN UNTIL MONDAY SEPT 7TH 2020 COB. Please email your abstract to delzanno@lanl.gov (either directly or through the 'Submit an Abstract' button above). There is no specific format, but abstracts are limited to 1 page maximum.

Multiple plasma populations coexist in the space environment around the Earth (known as the magnetosphere) including several populations of low-energy ions and electrons. Relative to other particle populations with higher energies, the cold ~eV ion and electron populations of the near-Earth environment are the least studied so that in some cases they have been referred to as the 'hidden populations'. In general, this is because issues associated with (a) spacecraft charging and (b) photoelectron emission (i.e. the fact that a spacecraft immersed in a plasma acquires a net electric charge by collecting plasma particles, and by emitting electrons via secondary emission or photo-emission) make reliable measurements of the cold-ion and cold-electron properties and their interpretation difficult.

However, the cold plasma plays a major role in magnetospheric dynamics. All of the magnetosphere's cold ions flow to the dayside magnetopause, where the cold ions can reduce solar-wind/magnetosphere coupling by mass-loading dayside reconnection. The presence of cold ions when magnetospheric convection slows down can increase the early-time refilling rate of the plasmasphere. Cold ions and cold electrons can affect waves and wave-particle interactions by changing (1) the resonant conditions between particles and waves, (2) the wave growth rates, (3) the saturation level of the waves, and (4) wave-particle diffusion coefficients, all with strong implications on the dynamics of plasma sheet, ring current, and radiation belts. The cold oxygen of the cloak changes ULF frequencies drastically, which alters the radial transport of radiation-belt particles. Cold electrons have repeatedly been implicated for the spatial structuring of diffuse and pulsating aurora.

Workshop Focus
Goals of the Workshop
  • Assess the impact of cold ions and cold electrons on the magnetospheric system
  • Assess ideas about the origins and evolutions of the cold-ion and cold-electron populations
  • Assess our need to know about the cold populations
  • Determine what is unknown from an observational point of view
  • Bring together theoretical and observational knowledge
  • Discuss future instrumentation concepts and future mission concepts
  • Form collaborations and focus future work

Format of the Workshop
  • Oral presentations and audience-participation discussions

Organizing Committee and Sponsors
LANL Organizing Committee
  • Gian Luca Delzanno (LANL)
  • Joseph E. Borovsky (Space Science Institute)

  • Center for Nonlinear Studies
  • Los Alamos National Laboratory
This event is brought to you by the Center for Nonlinear Studies and Los Alamos National Laboratory.
This event has been declared "Open to the Public - with Registration."