HR: 14:15h
AN: SH53A-02 INVITED     [Abstracts]
TI: Energetic Particle Intensities Produced at Shocks with Surface Ripples
AU: * Lario, D
EM: david.lario@jhuapl.edu
AF: The Johns Hopkins University. Applied Physics Laboratory, 11100 Johns Hopkins Rd., Laurel, MD 20723, United States
AU: Decker, R B
EM: rob.decker@jhuapl.edu
AF: The Johns Hopkins University. Applied Physics Laboratory, 11100 Johns Hopkins Rd., Laurel, MD 20723, United States
AB: Observations of traveling interplanetary shocks and energetic particle intensities have revealed a large variety of shock structures and associated energetic storm particle (ESP) events. Very few events agree with the complete set of predictions made by the diffusive shock acceleration theory. In fact the most common type of particle intensity enhancement associated with the passage of a shock is that with irregular time intensity profiles, i.e. multiple intensity bursts observed before and/or after the shock. Fluctuations of both the solar wind plasma where the shock travels and/or of the shock surface determine the main features of these ESP events with irregular variations of intensities and angular distributions. We present observations of one of these events where the pre-shock magnetic field was relatively steady. We show that ripples on the shock surface are responsible for the observational characteristics of the associated ESP event. Different trajectories of the spacecraft with respect to a given shock ripple result in ESP events of diverse nature.
DE: 2114 Energetic particles (7514)
DE: 2139 Interplanetary shocks
DE: 2164 Solar wind plasma
DE: 7859 Transport processes
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Joint Assembly