Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/930952

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Title
Upstream Pc3-4 waves: experimental evidence of propagation to the nightside plasmapause/plasmatrough
Author/Creator
Ponomarenko, P. V.;  Waters, C. L.;  St-Maurice, J. P.
Institution
The University of Newcastle. Faculty of Science & Information Technology, School of Mathematical and Physical Sciences
Description
Compressional magnetohydrodynamic (MHD) waves in the Pc3-4 frequency range (≃10–50 mHz) are generally believed to be generated upstream of the Earth's bow-shock in reflected proton beams. Inside the closed field-line geometry, these waves are conventionally considered to be a dayside phenomenon. However, recent studies suggest that some of the nighttime Pc4 pulsations may in fact have an upstream origin. In this letter, we report synchronous variations of the Pc3-4 spectra near post-dawn cusp and nightside plasmapause/plasmatrough as observed by HF radar and ground magnetometers. The measured Pc3-4 frequency closely follows that of the upstream waves theoretically predicted based on the dynamics of the interplanetary magnetic field, which presents the most convincing evidence to date of upstream-generated Pc3-4 waves propagating to the nightside magnetosphere in the closed field-line geometry. We conclude the letter with a brief discussion of a possible propagation scenario.
Relation
Geophysical Research Letters Vol. 37, Issue 22
Publisher Link
http://dx.doi.org/10.1029/2010gl045416
Date
2010
Publisher
American Geophysical Union
Keyword(s)
experimental evidence;  magnetohydrodynamic waves;  upstream waves;  ground magnetometer;  HF radars;  interplanetary magnetic fields
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/930952
Identifier
ISSN:0094-8276
Reviewed
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Subject
"Geophysical Research Letters"
 
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