Proton auroral intensification induced by interplanetary shock on 7 November 2004

Details Proton auroral intensification induced by interplanetary shock on 7 November 2004 Proton auroral intensification induced by interplanetary shock on 7 November 2004

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11608223s&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A8, CiteID A08223

Physics

Interplanetary Physics: Interplanetary Shocks, Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Plasma Waves And Instabilities (2471), Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

We report a shock-induced auroral intensification event observed by the IMAGE spacecraft on 7 November 2004. The comparison of simultaneous auroral snapshots, obtained from FUV-SI12 and FUV-SI13 cameras onboard IMAGE spacecraft, indicates the dominance of proton precipitation (rather than electron precipitation) throughout the auroral oval region. The proton aurora in the postnoon sector showed the most significant intensification, with luminosity increasing by 5 times or more. We describe the main characteristics of interplanetary parameters observed by the ACE and Geotail satellites and plasma parameters within the mapped precipitation region detected by the Los Alamos National Laboratory 1990-1995 satellite. The generation mechanism of postnoon proton auroral intensification is further investigated on the basis of these observations. The estimated increase of loss cone size was not enough to produce the required proton auroral precipitation enhancement. The expected oxygen band electromagnetic ion cyclotron waves (no available observation), in the highly fluctuating density region during the shock period, might contribute to the enhanced precipitation of auroral protons. Our new finding is that the shock-driven buildup of 1-10 keV proton fluxes could account for the observed proton auroral intensification.

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