Upstream Pc3-4 waves: Experimental evidence of propagation to the nightside plasmapause/plasmatrough

Details Upstream Pc3-4 waves: Experimental evidence of propagation to the nightside plasmapause/plasmatrough Upstream Pc3-4 waves: Experimental evidence of propagation to the nightside plasmapause/plasmatrough

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3722102p&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 22, CiteID L22102

Physics

Magnetospheric Physics: Mhd Waves And Instabilities (2149, 6050, 7836), Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

Compressional magnetohydrodynamic (MHD) waves in the Pc3-4 frequency range ($\simeq$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.

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