Dynamics of global scale electron and proton precipitation induced by a solar wind pressure pulse

Details Dynamics of global scale electron and proton precipitation induced by a solar wind pressure pulse Dynamics of global scale electron and proton precipitation induced by a solar wind pressure pulse

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30tssc1m&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 20, pp. SSC 1-1, CiteID 2032, DOI 10.1029/2003GL018017

Physics

12

Interplanetary Physics: Planetary Bow Shocks, Ionosphere: Auroral Ionosphere (2704), Magnetospheric Physics: Auroral Phenomena (2407)

Scientific paper

On April 28 2001, simultaneous global images of electron and proton aurora were obtained by IMAGE-FUV following a sudden increase of solar wind dynamic pressure. The local time and intensity distribution of both types of precipitation are examined and compared. It is found that the electron and the proton precipitation both start in the post noon sector and expand concurrently, but the expansion into the nightside starts sooner for the protons than for the electrons. The characteristic rise time in the onset sector is on the order of 6 minutes. A distinct dynamics and morphology of electron and proton precipitation is observed in the nightside sector. DMSP electron measurements in the afternoon sector indicate that the shock has a significant effect on the electron spectral characteristics. It is suggested that the various Alfven frequencies generated by the shock account for the two different speeds of propagation of the disturbance.

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