Modeling Multispacecraft Observations of Flux Dropouts seen in Impulsive Solar Particle Events

Astronomy and Astrophysics – Astrophysics

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7514 Energetic Particles (2114), 7519 Flares, 7524 Magnetic Fields, 7807 Charged Particle Motion And Acceleration

Scientific paper

We discuss new results from the analysis and modeling of the propagation of energetic particles associated with impulsive solar flares along the braided interplanetary magnetic field. Observations made by ACE/ULEIS have shown that many impulsive solar-flare events (tens of keV to MeV energies) often reveal fine-scale variations in which the intensity flickers on and off during the event. The flux dropouts are non-dispersive. One accepted interpretation of these events consists of intermittent particle fluxes resulting from the passage of the spacecraft through alternately filled and empty flux tubes. These variations are caused by field lines which were either connected or not connected to the flare site. Here we extend our previous analysis of these events (Giacalone et al.~Astrophys.~J.~Lett., 532, L75, 2000) and simulate the expected flux variations seen by more than one spacecraft with arbitrary orientations. We will compare the model results with observations made by WIND and ACE, an extension of the work by Mazur et al.~(Astropyhs.~J.~Lett., 532, L79, 2000), whenever possible.

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