Magnetospheric energetic particle response during the April 2002 event

Physics

Scientific paper

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2716 Energetic Particles, Precipitating, 2720 Energetic Particles, Trapped

Scientific paper

We examine the magnetospheric energetic particle response to the April 2002 storm events. During this period the magnetosphere was impacted by large CMEs and a major flare occurred on the sun. The Dst index shows a complicated structure with 3 separate storm signatures. Protons were observed injected deep within the magnetosphere and relativistic electron flux increases also peaked at low L values. We use energetic particle sensors onboard SAMPEX and Polar to survey this event. We present detailed time histories of electron and proton fluxes over a wide energy range including relativistic electron energy spectra. SAMPEX and Polar cover most L shells being in polar orbits with the former in low earth orbit and the latter at a much higher altitude. Characterization of energetic particles is important as they form a vital link in the Sun-Earth connection with their affects reaching down to the terrestrial atmosphere.

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