Lancaster EPrints

Revised time-of-flight calculations for high-latitude geomagnetic pulsations using a realistic magnetospheric magnetic field model

Wild, James A. and Yeoman, T. K. and Waters, C. L. (2005) Revised time-of-flight calculations for high-latitude geomagnetic pulsations using a realistic magnetospheric magnetic field model. Journal of Geophysical Research, 110 (A11). A11206. ISSN 0148-0227

[img]
Preview
PDF (art_720.pdf)
Download (439Kb) | Preview

    Abstract

    We present a simple time-of-flight analysis of Alfvén pulsations standing on closed terrestrial magnetic field lines. The technique employed in this study in order to calculate the characteristic period of such oscillations builds upon earlier time-of-flight estimates via the implementation of a more recent magnetospheric magnetic field model. In this case the model employed is the Tsyganenko (1996) field model, which includes realistic magnetospheric currents and the consequences of the partial penetration of the interplanetary magnetic field into the dayside magnetopause. By employing a simple description of magnetospheric plasma density, we are therefore able to estimate the period of standing Alfvén waves on geomagnetic field lines over a significantly wider range of latitudes and magnetic local times than in previous studies. Furthermore, we investigate the influence of changing season and upstream interplanetary conditions upon the period of such pulsations. Finally, the eigenfrequencies of magnetic field lines computed by the time-of-flight technique are compared with corresponding numerical solutions to the wave equation and experimentally observed pulsations on geomagnetic field lines.

    Item Type: Article
    Journal or Publication Title: Journal of Geophysical Research
    Additional Information: Copyright (2005) American Geophysical Union.
    Uncontrolled Keywords: DCS-publications-id ; art-720 ; DCS-publications-credits ; iono-fa ; samnet ; DCS-publications-personnel-id ; 104
    Subjects: T Technology > T Technology (General)
    Departments: Faculty of Science and Technology > School of Computing & Communications
    Faculty of Science and Technology > Physics
    ID Code: 6671
    Deposited By: ep_importer_dcs
    Deposited On: 21 Apr 2008 12:25
    Refereed?: Yes
    Published?: Published
    Last Modified: 09 Apr 2014 22:11
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/6671

    Actions (login required)

    View Item