Physics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ncimc...7..467i&link_type=abstract
Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol. 7 C, Sept.-Oct. 1984, p. 467-488. Research supported by the Consiglio Nazionale
Physics
9
Cosmic Ray Showers, Forbush Decreases, Interplanetary Medium, Solar Flares, Solar Terrestrial Interactions, Type 4 Bursts, Interplanetary Magnetic Fields, Plasma Clouds, Shock Wave Propagation, Solar Wind Velocity, Sudden Storm Commencements
Scientific paper
The interplanetary perturbations associated with Forbush decreases (FDs) during the period 1965-1974 are studied. The systematic appearance of the results obtained confirms once again that type IV solar flares are the origin of these perturbations. The front perturbation is a wide (about 100 deg in longitude) driven shock followed by a magnetic blob and a high-speed plasma cloud of about 0.5 AU average radial dimension at the earth orbit, emitted in a short time interval (less than 15 h) immediately following the beginning of the type IV burst. The FD-modulated region is found to be included between two boundary streams which rotate with the sun; therefore the FD can also be observed in the interplanetary regions which were not swept by the front perturbation. The FD amplitude appears to be correlated with an empirical parameter which accounts for the importance of the shock and magnetic blob at the front perturbation.
Iucci N.
Parisi Mario
Storini Marisa
Villoresi G.
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