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Global View of Energetic Particles During a Major Magnetic Storm

Global View of Energetic Particles During a Major Magnetic Storm,Timo Asikainen,Kalevi Mursula,Raine Kerttula,Reiner Friedel,Daniel Baker,Finn Søraas,

Global View of Energetic Particles During a Major Magnetic Storm   (Citations: 2)
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We study the global properties of energetic particles during the main and early recovery phase of a major magnetic storm of March 31, 2001, using data of the NOAA-15 and 16 and the CLUSTER satellites. During the storm main phase the ring current energetic electron and ion fluxes were increased by nearly two orders of magnitude, and the flux maxima were shifted to below L = 3. The maximum ion fluxes were observed at about 04-07 UT, coinciding with the strongly de- creasing Dst and maximum Kp. At this time the ring current was dominated by oxygen ions. However, the highest fluxes of energetic electrons were observed at considerably higher L shells and only at about 16-18 UT, in a good correlation with the maximum of the AE index. These observations indicate significant dif- ferences in the acceleration of energetic electrons and ions during the storm. We suggest that at least the low energy ring current ion flux maximum at about 04-06 UT is mainly due to the field-aligned acceleration of escaping ionospheric oxy- gens by electromagnetic ion cyclotron waves, whereas the electron maximum at 16-18 UT is due to a large injection from the nightside.
Published in 2005.
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    • ...Figures 1 and 2 display the data from NOAA-15 and 16 satellites during the great magnetic storm of March 31, 2001, which is discussed in more detail by [Asikainen et al., 2005]...
    • ...(Note that as the storm main phase starts at about 04 UT these two peaks diverge as ring current moves to lower L-shells [Asikainen et al., 2005])...

    T. Asikainenet al. Filling the South Atlantic anomaly by energetic electrons during a gre...

    • ...Figures 1 and 2 display the data from NOAA-15 and 16 satellites during the great magnetic storm of March 31, 2001, which is discussed in more detail by [Asikainen et al., 2005]...
    • ...(Note that as the storm main phase starts at about 04 UT these two peaks diverge as ring current moves to lower L-shells [Asikainen et al., 2005])...

    T. Asikainenet al. Filling the South Atlantic anomaly by energetic electrons during a gre...

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