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Surface Renewal: An Advanced Micrometeorological Method for Measuring and Processing Field-Scale Energy Flux Density Data
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Electron Microburst Size Distribution Derived With AeroCube-6.

M Shumko1, A T Johnson1, J G Sample1

  • 1Department of Physics Montana State University Bozeman MT USA.

Journal of Geophysical Research. Space Physics
|July 28, 2020
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Summary
This summary is machine-generated.

Microbursts, sudden electron bursts from radiation belts, are studied for their role in electron loss. This research quantifies microburst sizes, finding most are under 200 km at the magnetic equator.

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Area of Science:

  • Space Physics
  • Plasma Physics
  • Atmospheric Science

Background:

  • Microbursts are impulsive electron increases from Earth's radiation belts into the atmosphere.
  • They are suspected of rapidly depleting radiation belt electrons, but their exact contribution to electron loss is not well understood.

Purpose of the Study:

  • To statistically study the size distribution of microbursts.
  • To better quantify the role of microbursts in radiation belt electron losses.

Main Methods:

  • Utilized data from the AeroCube-6 CubeSat pair for statistical analysis.
  • Developed Monte Carlo and analytic models to test microburst size distributions.
  • Employed a Markov chain Monte Carlo sampler to estimate optimal model parameters.

Main Results:

  • Derived the microburst size distribution in low Earth orbit and at the magnetic equator.
  • Observed the majority of microbursts when CubeSat separation was minimal (tens of kilometers).
  • Determined that most observed microbursts are less than 200 km in size at the magnetic equator.

Conclusions:

  • The study provides a quantified size distribution for microbursts.
  • Findings suggest microbursts may play a significant role in radiation belt dynamics.
  • Comparison with whistler mode chorus wave distributions offers insights into microburst generation mechanisms.