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Title: Foreshock wave interaction with the magnetopause: Signatures of mode conversion

Authors:
ORCiD logo [1];  [2]; ORCiD logo [2]; ORCiD logo [2]
  1. Space Science Center, University of New Hampshire, Durham New Hampshire USA
  2. Department of Physics, Auburn University, Auburn Alabama USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1374903
Grant/Contract Number:
SC0010486
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 122; Journal Issue: 7; Related Information: CHORUS Timestamp: 2018-05-23 12:05:20; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English

Citation Formats

Shi, Feng, Cheng, Lei, Lin, Yu, and Wang, Xueyi. Foreshock wave interaction with the magnetopause: Signatures of mode conversion. United States: N. p., 2017. Web. doi:10.1002/2016JA023114.
Shi, Feng, Cheng, Lei, Lin, Yu, & Wang, Xueyi. Foreshock wave interaction with the magnetopause: Signatures of mode conversion. United States. doi:10.1002/2016JA023114.
Shi, Feng, Cheng, Lei, Lin, Yu, and Wang, Xueyi. Mon . "Foreshock wave interaction with the magnetopause: Signatures of mode conversion". United States. doi:10.1002/2016JA023114.
@article{osti_1374903,
title = {Foreshock wave interaction with the magnetopause: Signatures of mode conversion},
author = {Shi, Feng and Cheng, Lei and Lin, Yu and Wang, Xueyi},
abstractNote = {},
doi = {10.1002/2016JA023114},
journal = {Journal of Geophysical Research. Space Physics},
number = 7,
volume = 122,
place = {United States},
year = {Mon Jun 19 00:00:00 EDT 2017},
month = {Mon Jun 19 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on July 3, 2018
Publisher's Accepted Manuscript

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  • It has been suggested that resonant mode conversion of compressional MHD waves into kinetic Alfven waves at the magnetopause can explain the abrupt transition in wave polarization from compressional to transverse commonly observed during magnetopause crossings. The authors analyze magnetic field data for magnetopause crossings as a function of magnetic shear angle (defined as the angle between the magnetic fields in the magnetosheath and magnetosphere) and compare with the theory of resonant mode conversion. The data suggest that amplification in the transverse magnetic field component at the magnetopause is not significant up to a threshold magnetic shear angle. Above themore » threshold angle significant amplification results, but with weak dependence on magnetic shear angle. Waves with higher frequency are less amplified and have a higher threshold angle. These observations are qualitatively consistent with theoretical results obtained from the kinetic-fluid wave equations.« less
  • Cited by 1
  • High frequency electric field measurements from the AMPTE IRM plasma wave receiver are used to identify three simultaneously excited electrostatic wave modes in the Earth's foreshock region: the electron beam mode the Langmuir mode, and the ion acoustic mode. A technique is developed which allows the rest frame frequency and wave number of the electron beam waves to be determined. Plasma wave and magnetometer data are used to determine the interplanetary magnetic field direction at which the spacecraft becomes magnetically connected to the Earth's bow shock. From the knowledge of this direction, the upstreaming electron cutoff velocity can be calculated.more » The authors take this calculated cutoff velocity to be the flow velocity of an electron beam in the plasma. Assuming that the wave phase speed is approximately equal to the beam speed and using the measured electric field frequency, they determine the plasma rest frame frequency and the wave number. They then show that the experimentally determined rest frame frequency and wave number agree well with the most unstable frequency and wave number predicted by linear homogeneous Vlasov theory for a plasma with Maxwellian background electrons and a Lorentzian electron beam. From a comparison of the experimentally determined and theoretical values, approximate limits are put on the electron foreshock beam temperatures. A possible generation mechanism for ion acoustic waves involving mode coupling between the electron beam and Langmuir modes is also discussed.« less