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.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

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


    Contributors:
    Dimmock, A.P. (author) / Nykyri, K. (author) / Osmane, A. (author) / Pulkkinen, T.I. (author)

    Published in:

    Advances in Space Research ; 58 , 2 ; 196-207


    Publication date :

    2015-09-14


    Size :

    12 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





    Study of Neptune dayside magnetosheath fluctuations during Voyager-2 flyby

    Echer, Ezequiel / de Souza Franco, Adriane Marques / Magalhães, Fabíola Pinho et al. | Elsevier | 2022



    ISEE Observations of the Dayside Magnetosheath

    Song, P. | Online Contents | 1994


    ISEE Observations of the Dayside Magnetosheath

    Song, P. / COSPAR; Interdisciplinary Scientific Commission D | British Library Conference Proceedings | 1994