
doi: 10.1029/96gl01672
Observations from a recent rocket experiment that measured electrons over the energy range of 1–300 keV shows that microburst temporal structures exist from about 20 keV to >120 keV. Simultaneous observations at five different pitch‐angles (0°–90°) show the distribution is nearly isotropic during the bursts, while at low activity (quiet times and the valleys between microbursts) the distribution is anisotropic with higher fluxes at larger pitch‐angles. The energy spectra were reasonably fit with a Maxwellian, with an e‐folding energy Eo≈6–9 keV for α=0°, which increases to ≈ 10 keV at 67°. A modeling of electron spectra using the theory of pitch‐angle diffusion can reproduce the observed spectra, suggesting pitch‐angle scattering of electrons due to a wave‐particle interaction is the primary mechanism responsible for microbursts.
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