Are repetitive particle injections during high-speed solar wind streams classic substorms?

Details Are repetitive particle injections during high-speed solar wind streams classic substorms? Are repetitive particle injections during high-speed solar wind streams classic substorms?

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11308205k&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue A8, CiteID A08205

Physics

2

Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Substorms, Magnetospheric Physics: Instruments And Techniques, Magnetospheric Physics: Energetic Particles: Trapped, Magnetospheric Physics: Magnetosphere: Inner

Scientific paper

The relation between substorm occurrences, energetic particle injections, and High-Intensity Long-Duration Continuous AE Activity (HILDCAA) events has been an issue. To understand their relationship, we use global auroral images from the Wideband Imaging Camera (WIC) on the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) spacecraft to investigate auroral activity near the times of repetitive particle injections that occur every ~0.5 to 4 h during HILDCAA events. For the examined HILDCAA intervals during January-July 2003, we identified a total of 481 injection events. Good WIC imaging was available for 121 of these and showed substorm onset brightenings for a significant fraction of the 121 injections. Specifically, excluding 16 injections with ambiguous timings owing to the lack of a near-midnight spacecraft, we find that 93 of 105 injections (~88%) occurred within +/-5 min of a substorm auroral onset. If we include cases with up to 10-min timing difference, the percentage becomes 97%. These results indicate that a significant fraction of HILDCAA-time repetitive particle injections are substorm-associated and thus suggest that substorms are a major component of HILDCAA geomagnetic activity and a possible contributor to the sustained small negative Dst during these periods.

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