Direct Observation of Temporal and Spatial Structure in Auroral Electrons

Evans, David S.

doi:10.1007/978-94-010-3090-8_24

Cited by 12 publications

(1 citation statement)

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“…Within the arcs, smaller filamentary structures (arc elements) may have widths of order of 100m. The problem was first posed formally by Evans [1971 ] who observed that the distribution of scale sizes observed in rocket observations of total particle energy flux differed from the auroral width measurements made by Maggs and Davis [1968]. More width measurements of the auroral fine structure were made by Borovsky et al [1991 ] followed by an extensive, but inconclusive, review of proposed mechanisms [Borovsky, 1993].…”

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confidence: 99%

Aircraft observations conjugate to FAST: Auroral arc thicknesses

Stenbaek‐Nielsen¹,

Hallinan²,

Osborne³

et al. 1998

Geophysical Research Letters

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Abstract. Optical observations conjugate to the FAST satellite show good agreement between the widths of auroral structures observed optically and those inferred from the measured electron energy flux. The implication is that these structures are imposed by processes at or above the -4000 km altitude of FAST. A variety of widths down to about 2 km were observed, but there were no examples of finer scale structures. A pre-breakup weak discrete arc at the poleward edge of the diffuse aurora showed electron produced optical structures located on either side of upward going ion beams. The optical emission in the equatorward part of the diffuse aurora was caused almost exclusively by precipitating ions. The optical observations were made over northern Alaska between Jan 31 and Feb 16, 1997, from a jet aircraft carrying an all-sky and three narrow-field TV cameras.Introduction.

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