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Elves , Sprites & Gnomes. Atmospheric Transient Luminous Events Optical counterpart of upper atmosphere electromagnetic phenomena Reports on strange and elusive light sources from Aircraft pilots for many years (UFOs included) First measurement in 1990 Dedicated programs since 1995

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elves sprites gnomes
Elves, Sprites & Gnomes
  • Atmospheric Transient Luminous Events
      • Optical counterpart of upper atmosphere electromagnetic phenomena
  • Reports on strange and elusive light sources from Aircraft pilots for many years(UFOs included)
  • First measurement in 1990
  • Dedicated programs since 1995
          • EUSO proposal
  • From space 2000-2002
  • Extreme Upper atmosphere Space Observatory ?
  • Can ULTRA/BABY Contribute ? Open discussion

Didier Lebrun

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Elves, Sprites & Gnomes
  • Upper atmosphere flashes
      • Electrical discharges from 20 km to 100 km
        • From CLOUDS to “AIRGLOW”
  • N2 fluorescence highly concerned
      • Usually observed in N2(1P) band
        • Also in 2P and N2+(1N)
  • EUSO Background and/or study
      • Few milliseconds duration (shorter sprites ?)
      • Frequency ?
  • Terrestrial Gamma Ray Bursts

Didier Lebrun

elves sprites gnomes2
Elves, Sprites & Gnomes

Electro-Magnetic Pulse

E

“bad” vacuum

~ Paschen law

C-G Lightning

Also: Schumann resonances

Didier Lebrun

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Elves, Sprites & Gnomes

Plasma tube

Discharge “zoology”

ELF : Reflected

Extreme Low Frequency

Radio signals

ELVES:

Emission of Light and

VLF perturbations due

to EMP Sources

Didier Lebrun

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Elves, Sprites & Gnomes

Frequency

Estimation from Ground, Aircraft, Balloon, Shuttle observations & relative frequency

with + CG storm lightning

1 / second. World wide

In EUSO : 1.8*e / revolution

MEIDEX on Shuttle

Didier Lebrun

lightnings
Lightnings

Didier Lebrun

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Elves, Sprites & Gnomes

N2 fluorescence

Didier Lebrun

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Elves, Sprites & Gnomes

N2 fluorescence

  • “Colour” characterizes energetics
    • NUV and Blue
      • 1N+/2P ~ 1 Lightning
      • 1N+/2P ~ 2 Sprite
      • 1N+/2P ~ 3 Elf
  • “Colour” characterizes age
    • Blue (<100ms-1 ms) to Red (~1-10 ms)
      • Longer than 100 ms for Blue Jets

Didier Lebrun

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Elves, Sprites & Gnomes

Luminosity

Estimated energy transfer to upper Atmosphere

1 GJ /event

Observed by UAF95 and EXL98 in 400-700nm

1.8 1023 Photons / Sprite

Didier Lebrun

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Elves, Sprites & Gnomes

Runaway model

Didier Lebrun

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Elves, Sprites & Gnomes

g Ray Bursts

CGRO/BATSE

Didier Lebrun

euso ultra
EUSO/ULTRA ?
  • Many programs worldwide
    • Space missions on Shuttle, ISS and free
      • Example : CNES LSO, DEMETER, TARANIS…
      • Link to optical airglow survey
        • “Gravity waves”
        • Earthquake precursors
  • Ground Observation ?
  • What in 2009 ?

Didier Lebrun

slide13
Earth- Atmosphere-Ionosphere Interaction
      • Electrical balance & Energy transfer (global warming)
      • Chemical aspects (Ozone,,NO formation)
      • Meteo
      • Geophysics volcanoes and earthquakes
      • …..Defense (world wide survey,
  • Sun-Earth interaction and planetary science
  • Role of cosmic rays as a seed

Didier Lebrun

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