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

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Revised time-of-flight calculations for high-latitude geomagnetic pulsations using a realistic magnetospheric magnetic field model. / Wild, James A.; Yeoman, T. K.; Waters, C. L.
In: Journal of Geophysical Research, Vol. 110, No. A11, 11.2005, p. A11206.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

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Wild JA, Yeoman TK, Waters CL. Revised time-of-flight calculations for high-latitude geomagnetic pulsations using a realistic magnetospheric magnetic field model. Journal of Geophysical Research. 2005 Nov;110(A11):A11206. doi: 10.1029/2004JA010964

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Wild, James A. ; Yeoman, T. K. ; Waters, C. L. / Revised time-of-flight calculations for high-latitude geomagnetic pulsations using a realistic magnetospheric magnetic field model. In: Journal of Geophysical Research. 2005 ; Vol. 110, No. A11. pp. A11206.

Bibtex

@article{1231d21c64af412caec47f14adc8f9f5,
title = "Revised time-of-flight calculations for high-latitude geomagnetic pulsations using a realistic magnetospheric magnetic field model",
abstract = "We present a simple time-of-flight analysis of Alfv{\'e}n 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 Alfv{\'e}n 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.",
keywords = "DCS-publications-id, art-720, DCS-publications-credits, iono-fa, samnet, DCS-publications-personnel-id, 104",
author = "Wild, {James A.} and Yeoman, {T. K.} and Waters, {C. L.}",
note = "Copyright (2005) American Geophysical Union.",
year = "2005",
month = nov,
doi = "10.1029/2004JA010964",
language = "English",
volume = "110",
pages = "A11206",
journal = "Journal of Geophysical Research",
issn = "0148-0227",
publisher = "American Geophysical Union",
number = "A11",

}

RIS

TY - JOUR

T1 - Revised time-of-flight calculations for high-latitude geomagnetic pulsations using a realistic magnetospheric magnetic field model

AU - Wild, James A.

AU - Yeoman, T. K.

AU - Waters, C. L.

N1 - Copyright (2005) American Geophysical Union.

PY - 2005/11

Y1 - 2005/11

N2 - 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.

AB - 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.

KW - DCS-publications-id

KW - art-720

KW - DCS-publications-credits

KW - iono-fa

KW - samnet

KW - DCS-publications-personnel-id

KW - 104

U2 - 10.1029/2004JA010964

DO - 10.1029/2004JA010964

M3 - Journal article

VL - 110

SP - A11206

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

SN - 0148-0227

IS - A11

ER -