Relation the forbush effects to the interplantary and geomagnetic activity

Details Relation the forbush effects to the interplantary and geomagnetic activity Relation the forbush effects to the interplantary and geomagnetic activity

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....9.3552b&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

1

Scientific paper

Properties of the Forbush effects (FE) and their relation to the sources and different parameters of the interplanetary medium and geospace, are the complex topic till now due to the great variety of FEs origin and manifestation. More definite relations appear to be derived employing the cosmic ray (CR) observations and different related parameters in the space and Earth's environment. To provide the statistical estimations a special database is created, which includes variations of the cosmic ray density and anisotropy, solar wind characteristics, interplanetary magnetic field, solar and geomagnetic data for about 2000 events observed in 1977-1980 and 1986-1997. The preliminary analysis allowed the main characteristics of the FEs and their relation with the solar wind and geomagnetic parameters to be derived and studied. A parameter of the interplanetary disturbance was found which is most closely correlated with the magnitude of the FE. A relation of the FE magnitude to the geomagnetic activity was derived as a dependence of the FE amplitude on the maximal Ap-index throughout the associated magnetic storm.

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