Interplanetary disturbances during Forbush decreases

Details Interplanetary disturbances during Forbush decreases Interplanetary disturbances during Forbush decreases

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984stin...8532075i&link_type=abstract

Unknown

Physics

Forbush Decreases, Interplanetary Magnetic Fields, Interplanetary Medium, Magnetic Storms, Type 4 Bursts, Cosmic Rays, Plasma Clouds, Solar Activity Effects

Scientific paper

Analysis of interplanetary perturbations associated with Forbush decreases (Fds) during 1965 to 1974 confirms that Type 4 solar flares are the origin of these perturbations. The front perturbation is a wide (100 deg in longitude) driven shock followed by a magnetic blob and a high-speed plasma cloud of 0.5 AU average radial dimension at the Earth orbit, emitted in a short time interval ( 15hr) immediately following the onset of the Type 4 burst. The Fd-modulated region is included between two boundary streams which rotate with the Sun; therefore the Fd can be observed also in the interplanetary regions which were not swept by the front perturbation. The Fd-amplitude is correlated with an empirical parameter which accounts for the importance of the shock and magnetic blob at the front perturbation.

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