Solar Extreme Events of 2003:
Fundamental Science and Applied Aspects

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Flares of solar energetic particles with E>1 GeV in October-November 2003
Filippov A.T., Timofeev V.E.,

On the decay of the 23rd cycle of activity of the end of October and of the beginning of November of 2003 on a visible disk of the Sun three major chromospheric flares in the region #486 with a generation of relativistic particles with e>7 109 eV and interplanetary shocks with a velocity of the order of 1000 km/s and more took place. The research of energetic particle fluxes on October 28,29 and November 2, 2003 are studies using the Yakutsk complex array and st. Tixie neutron supermonitor. To analyze events the data of cosmic ray station world network date and direct measurements interplanetary magnetic field parameters are used. Such events are observed rather rarely. For the whole period of continuous observations of cosmic rays during ~50 years such phenomena in solar activity were only 5 times. In this connection, the increase of cosmic rays at 1100 UT on October 28, 2003 gives rise to a special interest from the point of view of energetic particle source. During this event the presence of shock essentially influenced the diffusion process of energetic particles in interplanetary medium. In particular, the additional flux of relativistic particles was observed after reaching the maximum by flare particles before the arrival of shock at 0613 UT on October 29, 2003. It indicates to the existence during this time of another source of cosmic rays, i.e. the acceleration of particles up to relativistic energies in the front of interplanetary shock.

Skobeltsyn Institute of Nuclear Physics, Moscow State University, 2004