Diffusion of Echo 7 electron beams during bounce motion
The Echo 7 sounding rocket experiment injected electron beams into the magnetosphere and detected them after one or more bounces along field lines near L = 6.5. Waves with equatorial amplitudes of a few mV/m diffused the beams so that only {approx}2O% of the initial current returned to the rocket altitude in the northern hemisphere. On successive bounces the electron flux continued to drop at the same rate. These results imply a lifetime of {approx}1.7 for 20 kev electrons just outside of the loss cone. comparison with other Echo flights shows that the beam return is dependent upon geomagnetic conditions: low activity causes there to be less scattering, while high activity can actually prevent detection of the returning beam.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Aeronautics and Space Administration, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10167197
- Report Number(s):
- LA-UR-92-2284; CONF-9110188-1; ON: DE92018288; CNN: Grant NSG 5088
- Resource Relation:
- Conference: Chapman conference on auroral plasma dynamics,Minneapolis, MN (United States),21-25 Oct 1991; Other Information: PBD: [1992]
- Country of Publication:
- United States
- Language:
- English
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