Statistical mapping of ULF Pc3 velocity fluctuations in the Earth's dayside magnetosheath as a function of solar wind conditions

A. P. Dimmock*, K. Nykyri, A. Osmane, T. I. Pulkkinen

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    6 Citations (Scopus)

    Abstract

    In this paper, we present the results of a statistical study of Pc3 velocity fluctuations in the Earth's dayside magnetosheath. There exists a notable dawn-dusk asymmetry, such that velocity fluctuations generally exhibit enhanced spectral power in the magnetosheath downstream of the quasi-parallel shock. The fluctuations in the central magnetosheath and close to bow shock tend to dampen with increasing tail-ward distance while the opposite trend is observed close to the magnetopause. This strongly suggests that velocity shear driven processes such as the Kelvin-Helmholtz instability drive Pc3 flow variations close to the magnetopause as the velocity shear increases with increasing tail-ward distance. We also show strong evidence that Pc3 velocity fluctuations are significantly enhanced during intervals of faster solar wind speeds. We see negligible differences between data collected during northward and southward IMF orientations, but in general, a dawn-favoured asymmetry persists.

    Original languageEnglish
    Pages (from-to)196-207
    Number of pages12
    JournalAdvances in Space Research
    Volume58
    Issue number2
    DOIs
    Publication statusPublished - 15 Jul 2016
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Kelvin-Helmholtz instability
    • Magnetosheath
    • Magnetosphere
    • Pc3 waves
    • Velocity turbulence

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