Solar Extreme Events of 2003:
Fundamental Science and Applied Aspects

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Correlated measurements of the secondary cosmic ray fluxes by the Aragats Space-Environmental Center monitors
Chilingarian A., Babayan V., Bostanjyan N., Karapetyan G., Zazyan M.,

Radiation and Geomagnetic storms, which are elements of Space Weather, are part of the major obstacles for Space Operations. Reliable forecasting of the arrival of these dangerous elements is of vital importance for the orbiting flights and many industrial applications. In addition to the fleet of space-born instruments, world-wide networks of particle detectors spread along different latitudes and longitudes and if possible at high altitudes, provide valuable information on the intensity and anisotropy of the variable cosmic ray fluxes. The geomagnetic storms are driven by the magnetized plasma clouds approaching the Earth and by interacting with the magnetosphere they induce electric currents on Earth and in conductors such as pipelines and electricity lines. The arrival time of the plasma cloud can be estimated using data from coronagraphs located at the L1 point; however, the strength of the geomagnetic storms depends on the shape and space distribution of the 'frozen' magnetic fields in the cloud. Information on the anisotropy of muons generated in the atmosphere by the galactic cosmic rays provides the appropriate tool for 'looking' inside the magnetized cloud far before it reaches the Earth. We demonstrated the sensitivity of the correlations of the different species of secondary cosmic ray flux to geophysical conditions, taking as examples extremely violent events of end of October - beginning of November 2003. The correlation analysis could be useful for to make warnings and alerts reliable and, as much as possible, avoid 'false alarms' it is necessary to measure components of the cosmic ray flux with inherent correlations.

Skobeltsyn Institute of Nuclear Physics, Moscow State University, 2004