The longitudinal asymmetry of the interplanetary perturbation producing Forbush decreases

Details The longitudinal asymmetry of the interplanetary perturbation producing Forbush decreases The longitudinal asymmetry of the interplanetary perturbation producing Forbush decreases

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ncimc...9...39i&link_type=abstract

Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol. 9 C, Jan.-Feb. 1986, p. 39-50. Research supported by the Universita di Roma and

Physics

19

Forbush Decreases, Interplanetary Magnetic Fields, Interplanetary Medium, Solar Flares, Solar Longitude, Solar Terrestrial Interactions, Galactic Cosmic Rays, Magnetic Disturbances, Shock Waves

Scientific paper

Experimental data are analyzed to show that an asymmetric perturbation trailing the shock front from a solar flare event is the cause of the longitudinal asymmetry of two-step Forbush decreases. The database includes earth-based neutron counter data and full sets of plasma and magnetic field data covering the interval from several days before passage of an interplanetary shock wave associated with a type II/IV flare and several days after the event. Longitudinal data were also available for the flare event. A statistical analysis is carried out of the separate effects of the shock front and the succeeding magnetic perturbation on the amplitude of the first and second steps of observed Forbush decreases as a function of the flare longitude. The first step of the decrease exhibits a high correlation with the shock wave passage at the earth. The second step correlates with the magnetic blob following the shock waves, and is asymmetric because the perturbation is stronger between 10-40 deg W of the flare's meridian plane.

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